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1477 lines
28 KiB
C
1477 lines
28 KiB
C
/* Simulation code for the MIPS MDMX ASE.
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Copyright (C) 2002, 2007, 2008, 2009 Free Software Foundation, Inc.
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Contributed by Ed Satterthwaite and Chris Demetriou, of Broadcom
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Corporation (SiByte).
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This file is part of GDB, the GNU debugger.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include "sim-main.h"
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/* Within mdmx.c we refer to the sim_cpu directly. */
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#define CPU cpu
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#define SD (CPU_STATE(CPU))
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/* XXX FIXME: temporary hack while the impact of making unpredictable()
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a "normal" (non-igen) function is evaluated. */
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#undef Unpredictable
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#define Unpredictable() unpredictable_action (cpu, cia)
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/* MDMX Representations
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An 8-bit packed byte element (OB) is always unsigned.
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The 24-bit accumulators are signed and are represented as 32-bit
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signed values, which are reduced to 24-bit signed values prior to
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Round and Clamp operations.
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A 16-bit packed halfword element (QH) is always signed.
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The 48-bit accumulators are signed and are represented as 64-bit
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signed values, which are reduced to 48-bit signed values prior to
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Round and Clamp operations.
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The code below assumes a 2's-complement representation of signed
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quantities. Care is required to clear extended sign bits when
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repacking fields.
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The code (and the code for arithmetic shifts in mips.igen) also makes
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the (not guaranteed portable) assumption that right shifts of signed
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quantities in C do sign extension. */
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typedef unsigned64 unsigned48;
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#define MASK48 (UNSIGNED64 (0xffffffffffff))
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typedef unsigned32 unsigned24;
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#define MASK24 (UNSIGNED32 (0xffffff))
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typedef enum {
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mdmx_ob, /* OB (octal byte) */
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mdmx_qh /* QH (quad half-word) */
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} MX_fmt;
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typedef enum {
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sel_elem, /* element select */
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sel_vect, /* vector select */
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sel_imm /* immediate select */
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} VT_select;
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#define OB_MAX ((unsigned8)0xFF)
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#define QH_MIN ((signed16)0x8000)
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#define QH_MAX ((signed16)0x7FFF)
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#define OB_CLAMP(x) ((unsigned8)((x) > OB_MAX ? OB_MAX : (x)))
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#define QH_CLAMP(x) ((signed16)((x) < QH_MIN ? QH_MIN : \
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((x) > QH_MAX ? QH_MAX : (x))))
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#define MX_FMT(fmtsel) (((fmtsel) & 0x1) == 0 ? mdmx_ob : mdmx_qh)
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#define MX_VT(fmtsel) (((fmtsel) & 0x10) == 0 ? sel_elem : \
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(((fmtsel) & 0x18) == 0x10 ? sel_vect : sel_imm))
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#define QH_ELEM(v,fmtsel) \
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((signed16)(((v) >> (((fmtsel) & 0xC) << 2)) & 0xFFFF))
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#define OB_ELEM(v,fmtsel) \
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((unsigned8)(((v) >> (((fmtsel) & 0xE) << 2)) & 0xFF))
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typedef signed16 (*QH_FUNC)(signed16, signed16);
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typedef unsigned8 (*OB_FUNC)(unsigned8, unsigned8);
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/* vectorized logical operators */
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static signed16
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AndQH(signed16 ts, signed16 tt)
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{
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return (signed16)((unsigned16)ts & (unsigned16)tt);
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}
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static unsigned8
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AndOB(unsigned8 ts, unsigned8 tt)
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{
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return ts & tt;
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}
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static signed16
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NorQH(signed16 ts, signed16 tt)
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{
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return (signed16)(((unsigned16)ts | (unsigned16)tt) ^ 0xFFFF);
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}
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static unsigned8
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NorOB(unsigned8 ts, unsigned8 tt)
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{
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return (ts | tt) ^ 0xFF;
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}
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static signed16
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OrQH(signed16 ts, signed16 tt)
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{
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return (signed16)((unsigned16)ts | (unsigned16)tt);
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}
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static unsigned8
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OrOB(unsigned8 ts, unsigned8 tt)
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{
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return ts | tt;
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}
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static signed16
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XorQH(signed16 ts, signed16 tt)
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{
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return (signed16)((unsigned16)ts ^ (unsigned16)tt);
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}
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static unsigned8
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XorOB(unsigned8 ts, unsigned8 tt)
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{
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return ts ^ tt;
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}
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static signed16
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SLLQH(signed16 ts, signed16 tt)
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{
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unsigned32 s = (unsigned32)tt & 0xF;
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return (signed16)(((unsigned32)ts << s) & 0xFFFF);
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}
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static unsigned8
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SLLOB(unsigned8 ts, unsigned8 tt)
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{
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unsigned32 s = tt & 0x7;
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return (ts << s) & 0xFF;
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}
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static signed16
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SRLQH(signed16 ts, signed16 tt)
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{
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unsigned32 s = (unsigned32)tt & 0xF;
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return (signed16)((unsigned16)ts >> s);
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}
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static unsigned8
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SRLOB(unsigned8 ts, unsigned8 tt)
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{
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unsigned32 s = tt & 0x7;
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return ts >> s;
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}
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/* Vectorized arithmetic operators. */
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static signed16
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AddQH(signed16 ts, signed16 tt)
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{
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signed32 t = (signed32)ts + (signed32)tt;
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return QH_CLAMP(t);
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}
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static unsigned8
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AddOB(unsigned8 ts, unsigned8 tt)
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{
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unsigned32 t = (unsigned32)ts + (unsigned32)tt;
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return OB_CLAMP(t);
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}
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static signed16
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SubQH(signed16 ts, signed16 tt)
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{
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signed32 t = (signed32)ts - (signed32)tt;
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return QH_CLAMP(t);
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}
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static unsigned8
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SubOB(unsigned8 ts, unsigned8 tt)
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{
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signed32 t;
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t = (signed32)ts - (signed32)tt;
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if (t < 0)
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t = 0;
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return (unsigned8)t;
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}
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static signed16
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MinQH(signed16 ts, signed16 tt)
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{
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return (ts < tt ? ts : tt);
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}
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static unsigned8
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MinOB(unsigned8 ts, unsigned8 tt)
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{
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return (ts < tt ? ts : tt);
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}
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static signed16
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MaxQH(signed16 ts, signed16 tt)
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{
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return (ts > tt ? ts : tt);
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}
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static unsigned8
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MaxOB(unsigned8 ts, unsigned8 tt)
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{
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return (ts > tt ? ts : tt);
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}
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static signed16
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MulQH(signed16 ts, signed16 tt)
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{
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signed32 t = (signed32)ts * (signed32)tt;
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return QH_CLAMP(t);
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}
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static unsigned8
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MulOB(unsigned8 ts, unsigned8 tt)
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{
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unsigned32 t = (unsigned32)ts * (unsigned32)tt;
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return OB_CLAMP(t);
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}
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/* "msgn" and "sra" are defined only for QH format. */
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static signed16
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MsgnQH(signed16 ts, signed16 tt)
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{
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signed16 t;
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if (ts < 0)
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t = (tt == QH_MIN ? QH_MAX : -tt);
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else if (ts == 0)
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t = 0;
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else
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t = tt;
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return t;
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}
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static signed16
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SRAQH(signed16 ts, signed16 tt)
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{
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unsigned32 s = (unsigned32)tt & 0xF;
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return (signed16)((signed32)ts >> s);
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}
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/* "pabsdiff" and "pavg" are defined only for OB format. */
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static unsigned8
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AbsDiffOB(unsigned8 ts, unsigned8 tt)
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{
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return (ts >= tt ? ts - tt : tt - ts);
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}
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static unsigned8
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AvgOB(unsigned8 ts, unsigned8 tt)
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{
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return ((unsigned32)ts + (unsigned32)tt + 1) >> 1;
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}
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/* Dispatch tables for operations that update a CPR. */
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static const QH_FUNC qh_func[] = {
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AndQH, NorQH, OrQH, XorQH, SLLQH, SRLQH,
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AddQH, SubQH, MinQH, MaxQH,
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MulQH, MsgnQH, SRAQH, NULL, NULL
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};
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static const OB_FUNC ob_func[] = {
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AndOB, NorOB, OrOB, XorOB, SLLOB, SRLOB,
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AddOB, SubOB, MinOB, MaxOB,
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MulOB, NULL, NULL, AbsDiffOB, AvgOB
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};
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/* Auxiliary functions for CPR updates. */
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/* Vector mapping for QH format. */
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static unsigned64
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qh_vector_op(unsigned64 v1, unsigned64 v2, QH_FUNC func)
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{
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unsigned64 result = 0;
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int i;
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signed16 h, h1, h2;
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for (i = 0; i < 64; i += 16)
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{
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h1 = (signed16)(v1 & 0xFFFF); v1 >>= 16;
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h2 = (signed16)(v2 & 0xFFFF); v2 >>= 16;
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h = (*func)(h1, h2);
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result |= ((unsigned64)((unsigned16)h) << i);
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}
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return result;
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}
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static unsigned64
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qh_map_op(unsigned64 v1, signed16 h2, QH_FUNC func)
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{
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unsigned64 result = 0;
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int i;
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signed16 h, h1;
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for (i = 0; i < 64; i += 16)
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{
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h1 = (signed16)(v1 & 0xFFFF); v1 >>= 16;
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h = (*func)(h1, h2);
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result |= ((unsigned64)((unsigned16)h) << i);
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}
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return result;
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}
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/* Vector operations for OB format. */
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static unsigned64
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ob_vector_op(unsigned64 v1, unsigned64 v2, OB_FUNC func)
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{
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unsigned64 result = 0;
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int i;
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unsigned8 b, b1, b2;
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for (i = 0; i < 64; i += 8)
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{
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b1 = v1 & 0xFF; v1 >>= 8;
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b2 = v2 & 0xFF; v2 >>= 8;
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b = (*func)(b1, b2);
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result |= ((unsigned64)b << i);
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}
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return result;
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}
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static unsigned64
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ob_map_op(unsigned64 v1, unsigned8 b2, OB_FUNC func)
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{
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unsigned64 result = 0;
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int i;
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unsigned8 b, b1;
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for (i = 0; i < 64; i += 8)
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{
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b1 = v1 & 0xFF; v1 >>= 8;
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b = (*func)(b1, b2);
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result |= ((unsigned64)b << i);
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}
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return result;
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}
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/* Primary entry for operations that update CPRs. */
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unsigned64
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mdmx_cpr_op(sim_cpu *cpu,
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address_word cia,
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int op,
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unsigned64 op1,
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int vt,
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MX_fmtsel fmtsel)
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{
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unsigned64 op2;
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unsigned64 result = 0;
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switch (MX_FMT (fmtsel))
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{
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case mdmx_qh:
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switch (MX_VT (fmtsel))
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{
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case sel_elem:
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op2 = ValueFPR(vt, fmt_mdmx);
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result = qh_map_op(op1, QH_ELEM(op2, fmtsel), qh_func[op]);
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break;
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case sel_vect:
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result = qh_vector_op(op1, ValueFPR(vt, fmt_mdmx), qh_func[op]);
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break;
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case sel_imm:
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result = qh_map_op(op1, vt, qh_func[op]);
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break;
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}
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break;
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case mdmx_ob:
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switch (MX_VT (fmtsel))
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{
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case sel_elem:
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op2 = ValueFPR(vt, fmt_mdmx);
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result = ob_map_op(op1, OB_ELEM(op2, fmtsel), ob_func[op]);
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break;
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case sel_vect:
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result = ob_vector_op(op1, ValueFPR(vt, fmt_mdmx), ob_func[op]);
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break;
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case sel_imm:
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result = ob_map_op(op1, vt, ob_func[op]);
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break;
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}
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break;
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default:
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Unpredictable ();
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}
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return result;
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}
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/* Operations that update CCs */
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static void
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qh_vector_test(sim_cpu *cpu, unsigned64 v1, unsigned64 v2, int cond)
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{
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int i;
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signed16 h1, h2;
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int boolean;
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for (i = 0; i < 4; i++)
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{
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h1 = (signed16)(v1 & 0xFFFF); v1 >>= 16;
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h2 = (signed16)(v2 & 0xFFFF); v2 >>= 16;
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boolean = ((cond & MX_C_EQ) && (h1 == h2)) ||
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((cond & MX_C_LT) && (h1 < h2));
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SETFCC(i, boolean);
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}
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}
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static void
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qh_map_test(sim_cpu *cpu, unsigned64 v1, signed16 h2, int cond)
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{
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int i;
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signed16 h1;
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int boolean;
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for (i = 0; i < 4; i++)
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{
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h1 = (signed16)(v1 & 0xFFFF); v1 >>= 16;
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boolean = ((cond & MX_C_EQ) && (h1 == h2)) ||
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((cond & MX_C_LT) && (h1 < h2));
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SETFCC(i, boolean);
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}
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}
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static void
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ob_vector_test(sim_cpu *cpu, unsigned64 v1, unsigned64 v2, int cond)
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{
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int i;
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unsigned8 b1, b2;
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int boolean;
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for (i = 0; i < 8; i++)
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{
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b1 = v1 & 0xFF; v1 >>= 8;
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b2 = v2 & 0xFF; v2 >>= 8;
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boolean = ((cond & MX_C_EQ) && (b1 == b2)) ||
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((cond & MX_C_LT) && (b1 < b2));
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SETFCC(i, boolean);
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}
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}
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static void
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ob_map_test(sim_cpu *cpu, unsigned64 v1, unsigned8 b2, int cond)
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{
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int i;
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unsigned8 b1;
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int boolean;
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for (i = 0; i < 8; i++)
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{
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b1 = (unsigned8)(v1 & 0xFF); v1 >>= 8;
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boolean = ((cond & MX_C_EQ) && (b1 == b2)) ||
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((cond & MX_C_LT) && (b1 < b2));
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SETFCC(i, boolean);
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}
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}
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void
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mdmx_cc_op(sim_cpu *cpu,
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address_word cia,
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int cond,
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unsigned64 v1,
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int vt,
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MX_fmtsel fmtsel)
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{
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unsigned64 op2;
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switch (MX_FMT (fmtsel))
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{
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case mdmx_qh:
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switch (MX_VT (fmtsel))
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{
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case sel_elem:
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op2 = ValueFPR(vt, fmt_mdmx);
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qh_map_test(cpu, v1, QH_ELEM(op2, fmtsel), cond);
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break;
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case sel_vect:
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qh_vector_test(cpu, v1, ValueFPR(vt, fmt_mdmx), cond);
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break;
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case sel_imm:
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qh_map_test(cpu, v1, vt, cond);
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break;
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}
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break;
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case mdmx_ob:
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switch (MX_VT (fmtsel))
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{
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case sel_elem:
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op2 = ValueFPR(vt, fmt_mdmx);
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ob_map_test(cpu, v1, OB_ELEM(op2, fmtsel), cond);
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break;
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case sel_vect:
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ob_vector_test(cpu, v1, ValueFPR(vt, fmt_mdmx), cond);
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break;
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case sel_imm:
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ob_map_test(cpu, v1, vt, cond);
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break;
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}
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break;
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default:
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Unpredictable ();
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}
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}
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/* Pick operations. */
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static unsigned64
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qh_vector_pick(sim_cpu *cpu, unsigned64 v1, unsigned64 v2, int tf)
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{
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unsigned64 result = 0;
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int i, s;
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unsigned16 h;
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s = 0;
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for (i = 0; i < 4; i++)
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{
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h = ((GETFCC(i) == tf) ? (v1 & 0xFFFF) : (v2 & 0xFFFF));
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v1 >>= 16; v2 >>= 16;
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result |= ((unsigned64)h << s);
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s += 16;
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}
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return result;
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}
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static unsigned64
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|
qh_map_pick(sim_cpu *cpu, unsigned64 v1, signed16 h2, int tf)
|
|
{
|
|
unsigned64 result = 0;
|
|
int i, s;
|
|
unsigned16 h;
|
|
|
|
s = 0;
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
h = (GETFCC(i) == tf) ? (v1 & 0xFFFF) : (unsigned16)h2;
|
|
v1 >>= 16;
|
|
result |= ((unsigned64)h << s);
|
|
s += 16;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static unsigned64
|
|
ob_vector_pick(sim_cpu *cpu, unsigned64 v1, unsigned64 v2, int tf)
|
|
{
|
|
unsigned64 result = 0;
|
|
int i, s;
|
|
unsigned8 b;
|
|
|
|
s = 0;
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
b = (GETFCC(i) == tf) ? (v1 & 0xFF) : (v2 & 0xFF);
|
|
v1 >>= 8; v2 >>= 8;
|
|
result |= ((unsigned64)b << s);
|
|
s += 8;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static unsigned64
|
|
ob_map_pick(sim_cpu *cpu, unsigned64 v1, unsigned8 b2, int tf)
|
|
{
|
|
unsigned64 result = 0;
|
|
int i, s;
|
|
unsigned8 b;
|
|
|
|
s = 0;
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
b = (GETFCC(i) == tf) ? (v1 & 0xFF) : b2;
|
|
v1 >>= 8;
|
|
result |= ((unsigned64)b << s);
|
|
s += 8;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
unsigned64
|
|
mdmx_pick_op(sim_cpu *cpu,
|
|
address_word cia,
|
|
int tf,
|
|
unsigned64 v1,
|
|
int vt,
|
|
MX_fmtsel fmtsel)
|
|
{
|
|
unsigned64 result = 0;
|
|
unsigned64 op2;
|
|
|
|
switch (MX_FMT (fmtsel))
|
|
{
|
|
case mdmx_qh:
|
|
switch (MX_VT (fmtsel))
|
|
{
|
|
case sel_elem:
|
|
op2 = ValueFPR(vt, fmt_mdmx);
|
|
result = qh_map_pick(cpu, v1, QH_ELEM(op2, fmtsel), tf);
|
|
break;
|
|
case sel_vect:
|
|
result = qh_vector_pick(cpu, v1, ValueFPR(vt, fmt_mdmx), tf);
|
|
break;
|
|
case sel_imm:
|
|
result = qh_map_pick(cpu, v1, vt, tf);
|
|
break;
|
|
}
|
|
break;
|
|
case mdmx_ob:
|
|
switch (MX_VT (fmtsel))
|
|
{
|
|
case sel_elem:
|
|
op2 = ValueFPR(vt, fmt_mdmx);
|
|
result = ob_map_pick(cpu, v1, OB_ELEM(op2, fmtsel), tf);
|
|
break;
|
|
case sel_vect:
|
|
result = ob_vector_pick(cpu, v1, ValueFPR(vt, fmt_mdmx), tf);
|
|
break;
|
|
case sel_imm:
|
|
result = ob_map_pick(cpu, v1, vt, tf);
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
Unpredictable ();
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
/* Accumulators. */
|
|
|
|
typedef void (*QH_ACC)(signed48 *a, signed16 ts, signed16 tt);
|
|
|
|
static void
|
|
AccAddAQH(signed48 *a, signed16 ts, signed16 tt)
|
|
{
|
|
*a += (signed48)ts + (signed48)tt;
|
|
}
|
|
|
|
static void
|
|
AccAddLQH(signed48 *a, signed16 ts, signed16 tt)
|
|
{
|
|
*a = (signed48)ts + (signed48)tt;
|
|
}
|
|
|
|
static void
|
|
AccMulAQH(signed48 *a, signed16 ts, signed16 tt)
|
|
{
|
|
*a += (signed48)ts * (signed48)tt;
|
|
}
|
|
|
|
static void
|
|
AccMulLQH(signed48 *a, signed16 ts, signed16 tt)
|
|
{
|
|
*a = (signed48)ts * (signed48)tt;
|
|
}
|
|
|
|
static void
|
|
SubMulAQH(signed48 *a, signed16 ts, signed16 tt)
|
|
{
|
|
*a -= (signed48)ts * (signed48)tt;
|
|
}
|
|
|
|
static void
|
|
SubMulLQH(signed48 *a, signed16 ts, signed16 tt)
|
|
{
|
|
*a = -((signed48)ts * (signed48)tt);
|
|
}
|
|
|
|
static void
|
|
AccSubAQH(signed48 *a, signed16 ts, signed16 tt)
|
|
{
|
|
*a += (signed48)ts - (signed48)tt;
|
|
}
|
|
|
|
static void
|
|
AccSubLQH(signed48 *a, signed16 ts, signed16 tt)
|
|
{
|
|
*a = (signed48)ts - (signed48)tt;
|
|
}
|
|
|
|
|
|
typedef void (*OB_ACC)(signed24 *acc, unsigned8 ts, unsigned8 tt);
|
|
|
|
static void
|
|
AccAddAOB(signed24 *a, unsigned8 ts, unsigned8 tt)
|
|
{
|
|
*a += (signed24)ts + (signed24)tt;
|
|
}
|
|
|
|
static void
|
|
AccAddLOB(signed24 *a, unsigned8 ts, unsigned8 tt)
|
|
{
|
|
*a = (signed24)ts + (signed24)tt;
|
|
}
|
|
|
|
static void
|
|
AccMulAOB(signed24 *a, unsigned8 ts, unsigned8 tt)
|
|
{
|
|
*a += (signed24)ts * (signed24)tt;
|
|
}
|
|
|
|
static void
|
|
AccMulLOB(signed24 *a, unsigned8 ts, unsigned8 tt)
|
|
{
|
|
*a = (signed24)ts * (signed24)tt;
|
|
}
|
|
|
|
static void
|
|
SubMulAOB(signed24 *a, unsigned8 ts, unsigned8 tt)
|
|
{
|
|
*a -= (signed24)ts * (signed24)tt;
|
|
}
|
|
|
|
static void
|
|
SubMulLOB(signed24 *a, unsigned8 ts, unsigned8 tt)
|
|
{
|
|
*a = -((signed24)ts * (signed24)tt);
|
|
}
|
|
|
|
static void
|
|
AccSubAOB(signed24 *a, unsigned8 ts, unsigned8 tt)
|
|
{
|
|
*a += (signed24)ts - (signed24)tt;
|
|
}
|
|
|
|
static void
|
|
AccSubLOB(signed24 *a, unsigned8 ts, unsigned8 tt)
|
|
{
|
|
*a = (signed24)ts - (signed24)tt;
|
|
}
|
|
|
|
static void
|
|
AccAbsDiffOB(signed24 *a, unsigned8 ts, unsigned8 tt)
|
|
{
|
|
unsigned8 t = (ts >= tt ? ts - tt : tt - ts);
|
|
*a += (signed24)t;
|
|
}
|
|
|
|
|
|
/* Dispatch tables for operations that update a CPR. */
|
|
|
|
static const QH_ACC qh_acc[] = {
|
|
AccAddAQH, AccAddAQH, AccMulAQH, AccMulLQH,
|
|
SubMulAQH, SubMulLQH, AccSubAQH, AccSubLQH,
|
|
NULL
|
|
};
|
|
|
|
static const OB_ACC ob_acc[] = {
|
|
AccAddAOB, AccAddLOB, AccMulAOB, AccMulLOB,
|
|
SubMulAOB, SubMulLOB, AccSubAOB, AccSubLOB,
|
|
AccAbsDiffOB
|
|
};
|
|
|
|
|
|
static void
|
|
qh_vector_acc(signed48 a[], unsigned64 v1, unsigned64 v2, QH_ACC acc)
|
|
{
|
|
int i;
|
|
signed16 h1, h2;
|
|
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
h1 = (signed16)(v1 & 0xFFFF); v1 >>= 16;
|
|
h2 = (signed16)(v2 & 0xFFFF); v2 >>= 16;
|
|
(*acc)(&a[i], h1, h2);
|
|
}
|
|
}
|
|
|
|
static void
|
|
qh_map_acc(signed48 a[], unsigned64 v1, signed16 h2, QH_ACC acc)
|
|
{
|
|
int i;
|
|
signed16 h1;
|
|
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
h1 = (signed16)(v1 & 0xFFFF); v1 >>= 16;
|
|
(*acc)(&a[i], h1, h2);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ob_vector_acc(signed24 a[], unsigned64 v1, unsigned64 v2, OB_ACC acc)
|
|
{
|
|
int i;
|
|
unsigned8 b1, b2;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
b1 = v1 & 0xFF; v1 >>= 8;
|
|
b2 = v2 & 0xFF; v2 >>= 8;
|
|
(*acc)(&a[i], b1, b2);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ob_map_acc(signed24 a[], unsigned64 v1, unsigned8 b2, OB_ACC acc)
|
|
{
|
|
int i;
|
|
unsigned8 b1;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
b1 = v1 & 0xFF; v1 >>= 8;
|
|
(*acc)(&a[i], b1, b2);
|
|
}
|
|
}
|
|
|
|
|
|
/* Primary entry for operations that accumulate */
|
|
void
|
|
mdmx_acc_op(sim_cpu *cpu,
|
|
address_word cia,
|
|
int op,
|
|
unsigned64 op1,
|
|
int vt,
|
|
MX_fmtsel fmtsel)
|
|
{
|
|
unsigned64 op2;
|
|
|
|
switch (MX_FMT (fmtsel))
|
|
{
|
|
case mdmx_qh:
|
|
switch (MX_VT (fmtsel))
|
|
{
|
|
case sel_elem:
|
|
op2 = ValueFPR(vt, fmt_mdmx);
|
|
qh_map_acc(ACC.qh, op1, QH_ELEM(op2, fmtsel), qh_acc[op]);
|
|
break;
|
|
case sel_vect:
|
|
qh_vector_acc(ACC.qh, op1, ValueFPR(vt, fmt_mdmx), qh_acc[op]);
|
|
break;
|
|
case sel_imm:
|
|
qh_map_acc(ACC.qh, op1, vt, qh_acc[op]);
|
|
break;
|
|
}
|
|
break;
|
|
case mdmx_ob:
|
|
switch (MX_VT (fmtsel))
|
|
{
|
|
case sel_elem:
|
|
op2 = ValueFPR(vt, fmt_mdmx);
|
|
ob_map_acc(ACC.ob, op1, OB_ELEM(op2, fmtsel), ob_acc[op]);
|
|
break;
|
|
case sel_vect:
|
|
ob_vector_acc(ACC.ob, op1, ValueFPR(vt, fmt_mdmx), ob_acc[op]);
|
|
break;
|
|
case sel_imm:
|
|
ob_map_acc(ACC.ob, op1, vt, ob_acc[op]);
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
Unpredictable ();
|
|
}
|
|
}
|
|
|
|
|
|
/* Reading and writing accumulator (no conversion). */
|
|
|
|
unsigned64
|
|
mdmx_rac_op(sim_cpu *cpu,
|
|
address_word cia,
|
|
int op,
|
|
int fmt)
|
|
{
|
|
unsigned64 result;
|
|
unsigned int shift;
|
|
int i;
|
|
|
|
shift = op; /* L = 00, M = 01, H = 10. */
|
|
result = 0;
|
|
|
|
switch (fmt)
|
|
{
|
|
case MX_FMT_QH:
|
|
shift <<= 4; /* 16 bits per element. */
|
|
for (i = 3; i >= 0; --i)
|
|
{
|
|
result <<= 16;
|
|
result |= ((ACC.qh[i] >> shift) & 0xFFFF);
|
|
}
|
|
break;
|
|
case MX_FMT_OB:
|
|
shift <<= 3; /* 8 bits per element. */
|
|
for (i = 7; i >= 0; --i)
|
|
{
|
|
result <<= 8;
|
|
result |= ((ACC.ob[i] >> shift) & 0xFF);
|
|
}
|
|
break;
|
|
default:
|
|
Unpredictable ();
|
|
}
|
|
return result;
|
|
}
|
|
|
|
void
|
|
mdmx_wacl(sim_cpu *cpu,
|
|
address_word cia,
|
|
int fmt,
|
|
unsigned64 vs,
|
|
unsigned64 vt)
|
|
{
|
|
int i;
|
|
|
|
switch (fmt)
|
|
{
|
|
case MX_FMT_QH:
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
signed32 s = (signed16)(vs & 0xFFFF);
|
|
ACC.qh[i] = ((signed48)s << 16) | (vt & 0xFFFF);
|
|
vs >>= 16; vt >>= 16;
|
|
}
|
|
break;
|
|
case MX_FMT_OB:
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
signed16 s = (signed8)(vs & 0xFF);
|
|
ACC.ob[i] = ((signed24)s << 8) | (vt & 0xFF);
|
|
vs >>= 8; vt >>= 8;
|
|
}
|
|
break;
|
|
default:
|
|
Unpredictable ();
|
|
}
|
|
}
|
|
|
|
void
|
|
mdmx_wach(sim_cpu *cpu,
|
|
address_word cia,
|
|
int fmt,
|
|
unsigned64 vs)
|
|
{
|
|
int i;
|
|
|
|
switch (fmt)
|
|
{
|
|
case MX_FMT_QH:
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
signed32 s = (signed16)(vs & 0xFFFF);
|
|
ACC.qh[i] &= ~((signed48)0xFFFF << 32);
|
|
ACC.qh[i] |= ((signed48)s << 32);
|
|
vs >>= 16;
|
|
}
|
|
break;
|
|
case MX_FMT_OB:
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
ACC.ob[i] &= ~((signed24)0xFF << 16);
|
|
ACC.ob[i] |= ((signed24)(vs & 0xFF) << 16);
|
|
vs >>= 8;
|
|
}
|
|
break;
|
|
default:
|
|
Unpredictable ();
|
|
}
|
|
}
|
|
|
|
|
|
/* Reading and writing accumulator (rounding conversions).
|
|
Enumerating function guarantees s >= 0 for QH ops. */
|
|
|
|
typedef signed16 (*QH_ROUND)(signed48 a, signed16 s);
|
|
|
|
#define QH_BIT(n) ((unsigned48)1 << (n))
|
|
#define QH_ONES(n) (((unsigned48)1 << (n))-1)
|
|
|
|
static signed16
|
|
RNASQH(signed48 a, signed16 s)
|
|
{
|
|
signed48 t;
|
|
signed16 result = 0;
|
|
|
|
if (s > 48)
|
|
result = 0;
|
|
else
|
|
{
|
|
t = (a >> s);
|
|
if ((a & QH_BIT(47)) == 0)
|
|
{
|
|
if (s > 0 && ((a >> (s-1)) & 1) == 1)
|
|
t++;
|
|
if (t > QH_MAX)
|
|
t = QH_MAX;
|
|
}
|
|
else
|
|
{
|
|
if (s > 0 && ((a >> (s-1)) & 1) == 1)
|
|
{
|
|
if (s > 1 && ((unsigned48)a & QH_ONES(s-1)) != 0)
|
|
t++;
|
|
}
|
|
if (t < QH_MIN)
|
|
t = QH_MIN;
|
|
}
|
|
result = (signed16)t;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static signed16
|
|
RNAUQH(signed48 a, signed16 s)
|
|
{
|
|
unsigned48 t;
|
|
signed16 result;
|
|
|
|
if (s > 48)
|
|
result = 0;
|
|
else if (s == 48)
|
|
result = ((unsigned48)a & MASK48) >> 47;
|
|
else
|
|
{
|
|
t = ((unsigned48)a & MASK48) >> s;
|
|
if (s > 0 && ((a >> (s-1)) & 1) == 1)
|
|
t++;
|
|
if (t > 0xFFFF)
|
|
t = 0xFFFF;
|
|
result = (signed16)t;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static signed16
|
|
RNESQH(signed48 a, signed16 s)
|
|
{
|
|
signed48 t;
|
|
signed16 result = 0;
|
|
|
|
if (s > 47)
|
|
result = 0;
|
|
else
|
|
{
|
|
t = (a >> s);
|
|
if (s > 0 && ((a >> (s-1)) & 1) == 1)
|
|
{
|
|
if (s == 1 || (a & QH_ONES(s-1)) == 0)
|
|
t += t & 1;
|
|
else
|
|
t += 1;
|
|
}
|
|
if ((a & QH_BIT(47)) == 0)
|
|
{
|
|
if (t > QH_MAX)
|
|
t = QH_MAX;
|
|
}
|
|
else
|
|
{
|
|
if (t < QH_MIN)
|
|
t = QH_MIN;
|
|
}
|
|
result = (signed16)t;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static signed16
|
|
RNEUQH(signed48 a, signed16 s)
|
|
{
|
|
unsigned48 t;
|
|
signed16 result;
|
|
|
|
if (s > 48)
|
|
result = 0;
|
|
else if (s == 48)
|
|
result = ((unsigned48)a > QH_BIT(47) ? 1 : 0);
|
|
else
|
|
{
|
|
t = ((unsigned48)a & MASK48) >> s;
|
|
if (s > 0 && ((a >> (s-1)) & 1) == 1)
|
|
{
|
|
if (s > 1 && (a & QH_ONES(s-1)) != 0)
|
|
t++;
|
|
else
|
|
t += t & 1;
|
|
}
|
|
if (t > 0xFFFF)
|
|
t = 0xFFFF;
|
|
result = (signed16)t;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static signed16
|
|
RZSQH(signed48 a, signed16 s)
|
|
{
|
|
signed48 t;
|
|
signed16 result = 0;
|
|
|
|
if (s > 47)
|
|
result = 0;
|
|
else
|
|
{
|
|
t = (a >> s);
|
|
if ((a & QH_BIT(47)) == 0)
|
|
{
|
|
if (t > QH_MAX)
|
|
t = QH_MAX;
|
|
}
|
|
else
|
|
{
|
|
if (t < QH_MIN)
|
|
t = QH_MIN;
|
|
}
|
|
result = (signed16)t;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static signed16
|
|
RZUQH(signed48 a, signed16 s)
|
|
{
|
|
unsigned48 t;
|
|
signed16 result = 0;
|
|
|
|
if (s > 48)
|
|
result = 0;
|
|
else if (s == 48)
|
|
result = ((unsigned48)a > QH_BIT(47) ? 1 : 0);
|
|
else
|
|
{
|
|
t = ((unsigned48)a & MASK48) >> s;
|
|
if (t > 0xFFFF)
|
|
t = 0xFFFF;
|
|
result = (signed16)t;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
typedef unsigned8 (*OB_ROUND)(signed24 a, unsigned8 s);
|
|
|
|
#define OB_BIT(n) ((unsigned24)1 << (n))
|
|
#define OB_ONES(n) (((unsigned24)1 << (n))-1)
|
|
|
|
static unsigned8
|
|
RNAUOB(signed24 a, unsigned8 s)
|
|
{
|
|
unsigned8 result;
|
|
unsigned24 t;
|
|
|
|
if (s > 24)
|
|
result = 0;
|
|
else if (s == 24)
|
|
result = ((unsigned24)a & MASK24) >> 23;
|
|
else
|
|
{
|
|
t = ((unsigned24)a & MASK24) >> s;
|
|
if (s > 0 && ((a >> (s-1)) & 1) == 1)
|
|
t ++;
|
|
result = OB_CLAMP(t);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static unsigned8
|
|
RNEUOB(signed24 a, unsigned8 s)
|
|
{
|
|
unsigned8 result;
|
|
unsigned24 t;
|
|
|
|
if (s > 24)
|
|
result = 0;
|
|
else if (s == 24)
|
|
result = (((unsigned24)a & MASK24) > OB_BIT(23) ? 1 : 0);
|
|
else
|
|
{
|
|
t = ((unsigned24)a & MASK24) >> s;
|
|
if (s > 0 && ((a >> (s-1)) & 1) == 1)
|
|
{
|
|
if (s > 1 && (a & OB_ONES(s-1)) != 0)
|
|
t++;
|
|
else
|
|
t += t & 1;
|
|
}
|
|
result = OB_CLAMP(t);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static unsigned8
|
|
RZUOB(signed24 a, unsigned8 s)
|
|
{
|
|
unsigned8 result;
|
|
unsigned24 t;
|
|
|
|
if (s >= 24)
|
|
result = 0;
|
|
else
|
|
{
|
|
t = ((unsigned24)a & MASK24) >> s;
|
|
result = OB_CLAMP(t);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
static const QH_ROUND qh_round[] = {
|
|
RNASQH, RNAUQH, RNESQH, RNEUQH, RZSQH, RZUQH
|
|
};
|
|
|
|
static const OB_ROUND ob_round[] = {
|
|
NULL, RNAUOB, NULL, RNEUOB, NULL, RZUOB
|
|
};
|
|
|
|
|
|
static unsigned64
|
|
qh_vector_round(sim_cpu *cpu, address_word cia, unsigned64 v2, QH_ROUND round)
|
|
{
|
|
unsigned64 result = 0;
|
|
int i, s;
|
|
signed16 h, h2;
|
|
|
|
s = 0;
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
h2 = (signed16)(v2 & 0xFFFF);
|
|
if (h2 >= 0)
|
|
h = (*round)(ACC.qh[i], h2);
|
|
else
|
|
{
|
|
UnpredictableResult ();
|
|
h = 0xdead;
|
|
}
|
|
v2 >>= 16;
|
|
result |= ((unsigned64)((unsigned16)h) << s);
|
|
s += 16;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static unsigned64
|
|
qh_map_round(sim_cpu *cpu, address_word cia, signed16 h2, QH_ROUND round)
|
|
{
|
|
unsigned64 result = 0;
|
|
int i, s;
|
|
signed16 h;
|
|
|
|
s = 0;
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
if (h2 >= 0)
|
|
h = (*round)(ACC.qh[i], h2);
|
|
else
|
|
{
|
|
UnpredictableResult ();
|
|
h = 0xdead;
|
|
}
|
|
result |= ((unsigned64)((unsigned16)h) << s);
|
|
s += 16;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static unsigned64
|
|
ob_vector_round(sim_cpu *cpu, address_word cia, unsigned64 v2, OB_ROUND round)
|
|
{
|
|
unsigned64 result = 0;
|
|
int i, s;
|
|
unsigned8 b, b2;
|
|
|
|
s = 0;
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
b2 = v2 & 0xFF; v2 >>= 8;
|
|
b = (*round)(ACC.ob[i], b2);
|
|
result |= ((unsigned64)b << s);
|
|
s += 8;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static unsigned64
|
|
ob_map_round(sim_cpu *cpu, address_word cia, unsigned8 b2, OB_ROUND round)
|
|
{
|
|
unsigned64 result = 0;
|
|
int i, s;
|
|
unsigned8 b;
|
|
|
|
s = 0;
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
b = (*round)(ACC.ob[i], b2);
|
|
result |= ((unsigned64)b << s);
|
|
s += 8;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
unsigned64
|
|
mdmx_round_op(sim_cpu *cpu,
|
|
address_word cia,
|
|
int rm,
|
|
int vt,
|
|
MX_fmtsel fmtsel)
|
|
{
|
|
unsigned64 op2;
|
|
unsigned64 result = 0;
|
|
|
|
switch (MX_FMT (fmtsel))
|
|
{
|
|
case mdmx_qh:
|
|
switch (MX_VT (fmtsel))
|
|
{
|
|
case sel_elem:
|
|
op2 = ValueFPR(vt, fmt_mdmx);
|
|
result = qh_map_round(cpu, cia, QH_ELEM(op2, fmtsel), qh_round[rm]);
|
|
break;
|
|
case sel_vect:
|
|
op2 = ValueFPR(vt, fmt_mdmx);
|
|
result = qh_vector_round(cpu, cia, op2, qh_round[rm]);
|
|
break;
|
|
case sel_imm:
|
|
result = qh_map_round(cpu, cia, vt, qh_round[rm]);
|
|
break;
|
|
}
|
|
break;
|
|
case mdmx_ob:
|
|
switch (MX_VT (fmtsel))
|
|
{
|
|
case sel_elem:
|
|
op2 = ValueFPR(vt, fmt_mdmx);
|
|
result = ob_map_round(cpu, cia, OB_ELEM(op2, fmtsel), ob_round[rm]);
|
|
break;
|
|
case sel_vect:
|
|
op2 = ValueFPR(vt, fmt_mdmx);
|
|
result = ob_vector_round(cpu, cia, op2, ob_round[rm]);
|
|
break;
|
|
case sel_imm:
|
|
result = ob_map_round(cpu, cia, vt, ob_round[rm]);
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
Unpredictable ();
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/* Shuffle operation. */
|
|
|
|
typedef struct {
|
|
enum {vs, ss, vt} source;
|
|
unsigned int index;
|
|
} sh_map;
|
|
|
|
static const sh_map ob_shuffle[][8] = {
|
|
/* MDMX 2.0 encodings (3-4, 6-7). */
|
|
/* vr5400 encoding (5), otherwise. */
|
|
{ }, /* RSVD */
|
|
{{vt,4}, {vs,4}, {vt,5}, {vs,5}, {vt,6}, {vs,6}, {vt,7}, {vs,7}}, /* RSVD */
|
|
{{vt,0}, {vs,0}, {vt,1}, {vs,1}, {vt,2}, {vs,2}, {vt,3}, {vs,3}}, /* RSVD */
|
|
{{vs,0}, {ss,0}, {vs,1}, {ss,1}, {vs,2}, {ss,2}, {vs,3}, {ss,3}}, /* upsl */
|
|
{{vt,1}, {vt,3}, {vt,5}, {vt,7}, {vs,1}, {vs,3}, {vs,5}, {vs,7}}, /* pach */
|
|
{{vt,0}, {vt,2}, {vt,4}, {vt,6}, {vs,0}, {vs,2}, {vs,4}, {vs,6}}, /* pacl */
|
|
{{vt,4}, {vs,4}, {vt,5}, {vs,5}, {vt,6}, {vs,6}, {vt,7}, {vs,7}}, /* mixh */
|
|
{{vt,0}, {vs,0}, {vt,1}, {vs,1}, {vt,2}, {vs,2}, {vt,3}, {vs,3}} /* mixl */
|
|
};
|
|
|
|
static const sh_map qh_shuffle[][4] = {
|
|
{{vt,2}, {vs,2}, {vt,3}, {vs,3}}, /* mixh */
|
|
{{vt,0}, {vs,0}, {vt,1}, {vs,1}}, /* mixl */
|
|
{{vt,1}, {vt,3}, {vs,1}, {vs,3}}, /* pach */
|
|
{ }, /* RSVD */
|
|
{{vt,1}, {vs,0}, {vt,3}, {vs,2}}, /* bfla */
|
|
{ }, /* RSVD */
|
|
{{vt,2}, {vt,3}, {vs,2}, {vs,3}}, /* repa */
|
|
{{vt,0}, {vt,1}, {vs,0}, {vs,1}} /* repb */
|
|
};
|
|
|
|
|
|
unsigned64
|
|
mdmx_shuffle(sim_cpu *cpu,
|
|
address_word cia,
|
|
int shop,
|
|
unsigned64 op1,
|
|
unsigned64 op2)
|
|
{
|
|
unsigned64 result = 0;
|
|
int i, s;
|
|
int op;
|
|
|
|
if ((shop & 0x3) == 0x1) /* QH format. */
|
|
{
|
|
op = shop >> 2;
|
|
s = 0;
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
unsigned64 v;
|
|
|
|
switch (qh_shuffle[op][i].source)
|
|
{
|
|
case vs:
|
|
v = op1;
|
|
break;
|
|
case vt:
|
|
v = op2;
|
|
break;
|
|
default:
|
|
Unpredictable ();
|
|
v = 0;
|
|
}
|
|
result |= (((v >> 16*qh_shuffle[op][i].index) & 0xFFFF) << s);
|
|
s += 16;
|
|
}
|
|
}
|
|
else if ((shop & 0x1) == 0x0) /* OB format. */
|
|
{
|
|
op = shop >> 1;
|
|
s = 0;
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
unsigned8 b;
|
|
unsigned int ishift = 8*ob_shuffle[op][i].index;
|
|
|
|
switch (ob_shuffle[op][i].source)
|
|
{
|
|
case vs:
|
|
b = (op1 >> ishift) & 0xFF;
|
|
break;
|
|
case ss:
|
|
b = ((op1 >> ishift) & 0x80) ? 0xFF : 0;
|
|
break;
|
|
case vt:
|
|
b = (op2 >> ishift) & 0xFF;
|
|
break;
|
|
default:
|
|
Unpredictable ();
|
|
b = 0;
|
|
}
|
|
result |= ((unsigned64)b << s);
|
|
s += 8;
|
|
}
|
|
}
|
|
else
|
|
Unpredictable ();
|
|
|
|
return result;
|
|
}
|