mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 23:53:55 +08:00
3d0d14f983
lindent these files:
errors lines of code errors/KLOC
arch/x86/math-emu/ 2236 9424 237.2
arch/x86/math-emu/ 128 8706 14.7
no other changes. No code changed:
text data bss dec hex filename
5589802 612739 3833856 10036397 9924ad vmlinux.before
5589802 612739 3833856 10036397 9924ad vmlinux.after
the intent of this patch is to ease the automated tracking of kernel
code quality - it's just much easier for us to maintain it if every file
in arch/x86 is supposed to be clean.
NOTE: it is a known problem of lindent that it causes some style damage
of its own, but it's a safe tool (well, except for the gcc array range
initializers extension), so we did the bulk of the changes via lindent,
and did the manual fixups in a followup patch.
the resulting math-emu code has been tested by Thomas Gleixner on a real
386 DX CPU as well, and it works fine.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
351 lines
8.1 KiB
C
351 lines
8.1 KiB
C
/*---------------------------------------------------------------------------+
|
|
| reg_compare.c |
|
|
| |
|
|
| Compare two floating point registers |
|
|
| |
|
|
| Copyright (C) 1992,1993,1994,1997 |
|
|
| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
|
|
| E-mail billm@suburbia.net |
|
|
| |
|
|
| |
|
|
+---------------------------------------------------------------------------*/
|
|
|
|
/*---------------------------------------------------------------------------+
|
|
| compare() is the core FPU_REG comparison function |
|
|
+---------------------------------------------------------------------------*/
|
|
|
|
#include "fpu_system.h"
|
|
#include "exception.h"
|
|
#include "fpu_emu.h"
|
|
#include "control_w.h"
|
|
#include "status_w.h"
|
|
|
|
static int compare(FPU_REG const *b, int tagb)
|
|
{
|
|
int diff, exp0, expb;
|
|
u_char st0_tag;
|
|
FPU_REG *st0_ptr;
|
|
FPU_REG x, y;
|
|
u_char st0_sign, signb = getsign(b);
|
|
|
|
st0_ptr = &st(0);
|
|
st0_tag = FPU_gettag0();
|
|
st0_sign = getsign(st0_ptr);
|
|
|
|
if (tagb == TAG_Special)
|
|
tagb = FPU_Special(b);
|
|
if (st0_tag == TAG_Special)
|
|
st0_tag = FPU_Special(st0_ptr);
|
|
|
|
if (((st0_tag != TAG_Valid) && (st0_tag != TW_Denormal))
|
|
|| ((tagb != TAG_Valid) && (tagb != TW_Denormal))) {
|
|
if (st0_tag == TAG_Zero) {
|
|
if (tagb == TAG_Zero)
|
|
return COMP_A_eq_B;
|
|
if (tagb == TAG_Valid)
|
|
return ((signb ==
|
|
SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B);
|
|
if (tagb == TW_Denormal)
|
|
return ((signb ==
|
|
SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)
|
|
| COMP_Denormal;
|
|
} else if (tagb == TAG_Zero) {
|
|
if (st0_tag == TAG_Valid)
|
|
return ((st0_sign ==
|
|
SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B);
|
|
if (st0_tag == TW_Denormal)
|
|
return ((st0_sign ==
|
|
SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)
|
|
| COMP_Denormal;
|
|
}
|
|
|
|
if (st0_tag == TW_Infinity) {
|
|
if ((tagb == TAG_Valid) || (tagb == TAG_Zero))
|
|
return ((st0_sign ==
|
|
SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B);
|
|
else if (tagb == TW_Denormal)
|
|
return ((st0_sign ==
|
|
SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)
|
|
| COMP_Denormal;
|
|
else if (tagb == TW_Infinity) {
|
|
/* The 80486 book says that infinities can be equal! */
|
|
return (st0_sign == signb) ? COMP_A_eq_B :
|
|
((st0_sign ==
|
|
SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B);
|
|
}
|
|
/* Fall through to the NaN code */
|
|
} else if (tagb == TW_Infinity) {
|
|
if ((st0_tag == TAG_Valid) || (st0_tag == TAG_Zero))
|
|
return ((signb ==
|
|
SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B);
|
|
if (st0_tag == TW_Denormal)
|
|
return ((signb ==
|
|
SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)
|
|
| COMP_Denormal;
|
|
/* Fall through to the NaN code */
|
|
}
|
|
|
|
/* The only possibility now should be that one of the arguments
|
|
is a NaN */
|
|
if ((st0_tag == TW_NaN) || (tagb == TW_NaN)) {
|
|
int signalling = 0, unsupported = 0;
|
|
if (st0_tag == TW_NaN) {
|
|
signalling =
|
|
(st0_ptr->sigh & 0xc0000000) == 0x80000000;
|
|
unsupported = !((exponent(st0_ptr) == EXP_OVER)
|
|
&& (st0_ptr->
|
|
sigh & 0x80000000));
|
|
}
|
|
if (tagb == TW_NaN) {
|
|
signalling |=
|
|
(b->sigh & 0xc0000000) == 0x80000000;
|
|
unsupported |= !((exponent(b) == EXP_OVER)
|
|
&& (b->sigh & 0x80000000));
|
|
}
|
|
if (signalling || unsupported)
|
|
return COMP_No_Comp | COMP_SNaN | COMP_NaN;
|
|
else
|
|
/* Neither is a signaling NaN */
|
|
return COMP_No_Comp | COMP_NaN;
|
|
}
|
|
|
|
EXCEPTION(EX_Invalid);
|
|
}
|
|
|
|
if (st0_sign != signb) {
|
|
return ((st0_sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)
|
|
| (((st0_tag == TW_Denormal) || (tagb == TW_Denormal)) ?
|
|
COMP_Denormal : 0);
|
|
}
|
|
|
|
if ((st0_tag == TW_Denormal) || (tagb == TW_Denormal)) {
|
|
FPU_to_exp16(st0_ptr, &x);
|
|
FPU_to_exp16(b, &y);
|
|
st0_ptr = &x;
|
|
b = &y;
|
|
exp0 = exponent16(st0_ptr);
|
|
expb = exponent16(b);
|
|
} else {
|
|
exp0 = exponent(st0_ptr);
|
|
expb = exponent(b);
|
|
}
|
|
|
|
#ifdef PARANOID
|
|
if (!(st0_ptr->sigh & 0x80000000))
|
|
EXCEPTION(EX_Invalid);
|
|
if (!(b->sigh & 0x80000000))
|
|
EXCEPTION(EX_Invalid);
|
|
#endif /* PARANOID */
|
|
|
|
diff = exp0 - expb;
|
|
if (diff == 0) {
|
|
diff = st0_ptr->sigh - b->sigh; /* Works only if ms bits are
|
|
identical */
|
|
if (diff == 0) {
|
|
diff = st0_ptr->sigl > b->sigl;
|
|
if (diff == 0)
|
|
diff = -(st0_ptr->sigl < b->sigl);
|
|
}
|
|
}
|
|
|
|
if (diff > 0) {
|
|
return ((st0_sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)
|
|
| (((st0_tag == TW_Denormal) || (tagb == TW_Denormal)) ?
|
|
COMP_Denormal : 0);
|
|
}
|
|
if (diff < 0) {
|
|
return ((st0_sign == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)
|
|
| (((st0_tag == TW_Denormal) || (tagb == TW_Denormal)) ?
|
|
COMP_Denormal : 0);
|
|
}
|
|
|
|
return COMP_A_eq_B
|
|
| (((st0_tag == TW_Denormal) || (tagb == TW_Denormal)) ?
|
|
COMP_Denormal : 0);
|
|
|
|
}
|
|
|
|
/* This function requires that st(0) is not empty */
|
|
int FPU_compare_st_data(FPU_REG const *loaded_data, u_char loaded_tag)
|
|
{
|
|
int f = 0, c;
|
|
|
|
c = compare(loaded_data, loaded_tag);
|
|
|
|
if (c & COMP_NaN) {
|
|
EXCEPTION(EX_Invalid);
|
|
f = SW_C3 | SW_C2 | SW_C0;
|
|
} else
|
|
switch (c & 7) {
|
|
case COMP_A_lt_B:
|
|
f = SW_C0;
|
|
break;
|
|
case COMP_A_eq_B:
|
|
f = SW_C3;
|
|
break;
|
|
case COMP_A_gt_B:
|
|
f = 0;
|
|
break;
|
|
case COMP_No_Comp:
|
|
f = SW_C3 | SW_C2 | SW_C0;
|
|
break;
|
|
#ifdef PARANOID
|
|
default:
|
|
EXCEPTION(EX_INTERNAL | 0x121);
|
|
f = SW_C3 | SW_C2 | SW_C0;
|
|
break;
|
|
#endif /* PARANOID */
|
|
}
|
|
setcc(f);
|
|
if (c & COMP_Denormal) {
|
|
return denormal_operand() < 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int compare_st_st(int nr)
|
|
{
|
|
int f = 0, c;
|
|
FPU_REG *st_ptr;
|
|
|
|
if (!NOT_EMPTY(0) || !NOT_EMPTY(nr)) {
|
|
setcc(SW_C3 | SW_C2 | SW_C0);
|
|
/* Stack fault */
|
|
EXCEPTION(EX_StackUnder);
|
|
return !(control_word & CW_Invalid);
|
|
}
|
|
|
|
st_ptr = &st(nr);
|
|
c = compare(st_ptr, FPU_gettagi(nr));
|
|
if (c & COMP_NaN) {
|
|
setcc(SW_C3 | SW_C2 | SW_C0);
|
|
EXCEPTION(EX_Invalid);
|
|
return !(control_word & CW_Invalid);
|
|
} else
|
|
switch (c & 7) {
|
|
case COMP_A_lt_B:
|
|
f = SW_C0;
|
|
break;
|
|
case COMP_A_eq_B:
|
|
f = SW_C3;
|
|
break;
|
|
case COMP_A_gt_B:
|
|
f = 0;
|
|
break;
|
|
case COMP_No_Comp:
|
|
f = SW_C3 | SW_C2 | SW_C0;
|
|
break;
|
|
#ifdef PARANOID
|
|
default:
|
|
EXCEPTION(EX_INTERNAL | 0x122);
|
|
f = SW_C3 | SW_C2 | SW_C0;
|
|
break;
|
|
#endif /* PARANOID */
|
|
}
|
|
setcc(f);
|
|
if (c & COMP_Denormal) {
|
|
return denormal_operand() < 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int compare_u_st_st(int nr)
|
|
{
|
|
int f = 0, c;
|
|
FPU_REG *st_ptr;
|
|
|
|
if (!NOT_EMPTY(0) || !NOT_EMPTY(nr)) {
|
|
setcc(SW_C3 | SW_C2 | SW_C0);
|
|
/* Stack fault */
|
|
EXCEPTION(EX_StackUnder);
|
|
return !(control_word & CW_Invalid);
|
|
}
|
|
|
|
st_ptr = &st(nr);
|
|
c = compare(st_ptr, FPU_gettagi(nr));
|
|
if (c & COMP_NaN) {
|
|
setcc(SW_C3 | SW_C2 | SW_C0);
|
|
if (c & COMP_SNaN) { /* This is the only difference between
|
|
un-ordered and ordinary comparisons */
|
|
EXCEPTION(EX_Invalid);
|
|
return !(control_word & CW_Invalid);
|
|
}
|
|
return 0;
|
|
} else
|
|
switch (c & 7) {
|
|
case COMP_A_lt_B:
|
|
f = SW_C0;
|
|
break;
|
|
case COMP_A_eq_B:
|
|
f = SW_C3;
|
|
break;
|
|
case COMP_A_gt_B:
|
|
f = 0;
|
|
break;
|
|
case COMP_No_Comp:
|
|
f = SW_C3 | SW_C2 | SW_C0;
|
|
break;
|
|
#ifdef PARANOID
|
|
default:
|
|
EXCEPTION(EX_INTERNAL | 0x123);
|
|
f = SW_C3 | SW_C2 | SW_C0;
|
|
break;
|
|
#endif /* PARANOID */
|
|
}
|
|
setcc(f);
|
|
if (c & COMP_Denormal) {
|
|
return denormal_operand() < 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
void fcom_st(void)
|
|
{
|
|
/* fcom st(i) */
|
|
compare_st_st(FPU_rm);
|
|
}
|
|
|
|
void fcompst(void)
|
|
{
|
|
/* fcomp st(i) */
|
|
if (!compare_st_st(FPU_rm))
|
|
FPU_pop();
|
|
}
|
|
|
|
void fcompp(void)
|
|
{
|
|
/* fcompp */
|
|
if (FPU_rm != 1) {
|
|
FPU_illegal();
|
|
return;
|
|
}
|
|
if (!compare_st_st(1))
|
|
poppop();
|
|
}
|
|
|
|
void fucom_(void)
|
|
{
|
|
/* fucom st(i) */
|
|
compare_u_st_st(FPU_rm);
|
|
|
|
}
|
|
|
|
void fucomp(void)
|
|
{
|
|
/* fucomp st(i) */
|
|
if (!compare_u_st_st(FPU_rm))
|
|
FPU_pop();
|
|
}
|
|
|
|
void fucompp(void)
|
|
{
|
|
/* fucompp */
|
|
if (FPU_rm == 1) {
|
|
if (!compare_u_st_st(1))
|
|
poppop();
|
|
} else
|
|
FPU_illegal();
|
|
}
|