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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 42 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190524100845.259718220@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
240 lines
6.3 KiB
C
240 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Linux/PA-RISC Project (http://www.parisc-linux.org/)
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*
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* Floating-point emulation code
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* Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
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*/
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/*
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* BEGIN_DESC
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*
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* Purpose:
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* Single Floating-point Round to Integer
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* Double Floating-point Round to Integer
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* Quad Floating-point Round to Integer (returns unimplemented)
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*
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* External Interfaces:
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* dbl_frnd(srcptr,nullptr,dstptr,status)
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* sgl_frnd(srcptr,nullptr,dstptr,status)
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*
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* END_DESC
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*/
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#include "float.h"
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#include "sgl_float.h"
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#include "dbl_float.h"
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#include "cnv_float.h"
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/*
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* Single Floating-point Round to Integer
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*/
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/*ARGSUSED*/
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int
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sgl_frnd(sgl_floating_point *srcptr,
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unsigned int *nullptr,
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sgl_floating_point *dstptr,
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unsigned int *status)
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{
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register unsigned int src, result;
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register int src_exponent;
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register boolean inexact = FALSE;
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src = *srcptr;
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/*
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* check source operand for NaN or infinity
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*/
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if ((src_exponent = Sgl_exponent(src)) == SGL_INFINITY_EXPONENT) {
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/*
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* is signaling NaN?
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*/
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if (Sgl_isone_signaling(src)) {
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/* trap if INVALIDTRAP enabled */
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if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
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/* make NaN quiet */
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Set_invalidflag();
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Sgl_set_quiet(src);
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}
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/*
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* return quiet NaN or infinity
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*/
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*dstptr = src;
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return(NOEXCEPTION);
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}
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/*
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* Need to round?
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*/
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if ((src_exponent -= SGL_BIAS) >= SGL_P - 1) {
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*dstptr = src;
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return(NOEXCEPTION);
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}
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/*
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* Generate result
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*/
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if (src_exponent >= 0) {
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Sgl_clear_exponent_set_hidden(src);
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result = src;
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Sgl_rightshift(result,(SGL_P-1) - (src_exponent));
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/* check for inexact */
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if (Sgl_isinexact_to_fix(src,src_exponent)) {
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inexact = TRUE;
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/* round result */
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switch (Rounding_mode()) {
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case ROUNDPLUS:
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if (Sgl_iszero_sign(src)) Sgl_increment(result);
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break;
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case ROUNDMINUS:
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if (Sgl_isone_sign(src)) Sgl_increment(result);
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break;
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case ROUNDNEAREST:
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if (Sgl_isone_roundbit(src,src_exponent))
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if (Sgl_isone_stickybit(src,src_exponent)
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|| (Sgl_isone_lowmantissa(result)))
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Sgl_increment(result);
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}
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}
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Sgl_leftshift(result,(SGL_P-1) - (src_exponent));
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if (Sgl_isone_hiddenoverflow(result))
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Sgl_set_exponent(result,src_exponent + (SGL_BIAS+1));
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else Sgl_set_exponent(result,src_exponent + SGL_BIAS);
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}
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else {
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result = src; /* set sign */
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Sgl_setzero_exponentmantissa(result);
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/* check for inexact */
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if (Sgl_isnotzero_exponentmantissa(src)) {
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inexact = TRUE;
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/* round result */
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switch (Rounding_mode()) {
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case ROUNDPLUS:
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if (Sgl_iszero_sign(src))
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Sgl_set_exponent(result,SGL_BIAS);
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break;
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case ROUNDMINUS:
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if (Sgl_isone_sign(src))
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Sgl_set_exponent(result,SGL_BIAS);
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break;
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case ROUNDNEAREST:
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if (src_exponent == -1)
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if (Sgl_isnotzero_mantissa(src))
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Sgl_set_exponent(result,SGL_BIAS);
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}
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}
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}
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*dstptr = result;
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if (inexact) {
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
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else Set_inexactflag();
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}
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return(NOEXCEPTION);
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}
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/*
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* Double Floating-point Round to Integer
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*/
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/*ARGSUSED*/
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int
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dbl_frnd(
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dbl_floating_point *srcptr,
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unsigned int *nullptr,
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dbl_floating_point *dstptr,
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unsigned int *status)
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{
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register unsigned int srcp1, srcp2, resultp1, resultp2;
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register int src_exponent;
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register boolean inexact = FALSE;
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Dbl_copyfromptr(srcptr,srcp1,srcp2);
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/*
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* check source operand for NaN or infinity
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*/
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if ((src_exponent = Dbl_exponent(srcp1)) == DBL_INFINITY_EXPONENT) {
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/*
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* is signaling NaN?
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*/
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if (Dbl_isone_signaling(srcp1)) {
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/* trap if INVALIDTRAP enabled */
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if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
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/* make NaN quiet */
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Set_invalidflag();
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Dbl_set_quiet(srcp1);
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}
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/*
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* return quiet NaN or infinity
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*/
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Dbl_copytoptr(srcp1,srcp2,dstptr);
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return(NOEXCEPTION);
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}
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/*
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* Need to round?
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*/
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if ((src_exponent -= DBL_BIAS) >= DBL_P - 1) {
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Dbl_copytoptr(srcp1,srcp2,dstptr);
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return(NOEXCEPTION);
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}
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/*
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* Generate result
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*/
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if (src_exponent >= 0) {
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Dbl_clear_exponent_set_hidden(srcp1);
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resultp1 = srcp1;
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resultp2 = srcp2;
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Dbl_rightshift(resultp1,resultp2,(DBL_P-1) - (src_exponent));
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/* check for inexact */
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if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) {
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inexact = TRUE;
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/* round result */
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switch (Rounding_mode()) {
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case ROUNDPLUS:
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if (Dbl_iszero_sign(srcp1))
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Dbl_increment(resultp1,resultp2);
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break;
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case ROUNDMINUS:
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if (Dbl_isone_sign(srcp1))
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Dbl_increment(resultp1,resultp2);
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break;
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case ROUNDNEAREST:
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if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent))
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if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent)
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|| (Dbl_isone_lowmantissap2(resultp2)))
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Dbl_increment(resultp1,resultp2);
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}
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}
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Dbl_leftshift(resultp1,resultp2,(DBL_P-1) - (src_exponent));
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if (Dbl_isone_hiddenoverflow(resultp1))
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Dbl_set_exponent(resultp1,src_exponent + (DBL_BIAS+1));
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else Dbl_set_exponent(resultp1,src_exponent + DBL_BIAS);
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}
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else {
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resultp1 = srcp1; /* set sign */
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Dbl_setzero_exponentmantissa(resultp1,resultp2);
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/* check for inexact */
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if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) {
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inexact = TRUE;
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/* round result */
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switch (Rounding_mode()) {
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case ROUNDPLUS:
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if (Dbl_iszero_sign(srcp1))
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Dbl_set_exponent(resultp1,DBL_BIAS);
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break;
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case ROUNDMINUS:
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if (Dbl_isone_sign(srcp1))
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Dbl_set_exponent(resultp1,DBL_BIAS);
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break;
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case ROUNDNEAREST:
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if (src_exponent == -1)
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if (Dbl_isnotzero_mantissa(srcp1,srcp2))
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Dbl_set_exponent(resultp1,DBL_BIAS);
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}
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}
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}
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Dbl_copytoptr(resultp1,resultp2,dstptr);
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if (inexact) {
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
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else Set_inexactflag();
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}
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return(NOEXCEPTION);
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}
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