c664bb1b46
* config/fpu-387.h: Include cpuid.h. (set_fpu): Use __get_cpuid to check for SSE. From-SVN: r128234
96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
/* FPU-related code for x86 and x86_64 processors.
|
|
Copyright 2005, 2007 Free Software Foundation, Inc.
|
|
Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
|
|
|
|
This file is part of the GNU Fortran 95 runtime library (libgfortran).
|
|
|
|
Libgfortran 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 of the License, or (at your option) any later version.
|
|
|
|
In addition to the permissions in the GNU General Public License, the
|
|
Free Software Foundation gives you unlimited permission to link the
|
|
compiled version of this file into combinations with other programs,
|
|
and to distribute those combinations without any restriction coming
|
|
from the use of this file. (The General Public License restrictions
|
|
do apply in other respects; for example, they cover modification of
|
|
the file, and distribution when not linked into a combine
|
|
executable.)
|
|
|
|
Libgfortran 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 libgfortran; see the file COPYING. If not,
|
|
write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA. */
|
|
|
|
#ifndef __x86_64__
|
|
#include "cpuid.h"
|
|
#endif
|
|
|
|
static int
|
|
has_sse (void)
|
|
{
|
|
#ifndef __x86_64__
|
|
unsigned int eax, ebx, ecx, edx;
|
|
|
|
if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
|
|
return 0;
|
|
|
|
return edx & bit_SSE;
|
|
#else
|
|
return 1;
|
|
#endif
|
|
}
|
|
|
|
/* i387 -- see linux <fpu_control.h> header file for details. */
|
|
#define _FPU_MASK_IM 0x01
|
|
#define _FPU_MASK_DM 0x02
|
|
#define _FPU_MASK_ZM 0x04
|
|
#define _FPU_MASK_OM 0x08
|
|
#define _FPU_MASK_UM 0x10
|
|
#define _FPU_MASK_PM 0x20
|
|
|
|
void set_fpu (void)
|
|
{
|
|
unsigned short cw;
|
|
|
|
asm volatile ("fnstcw %0" : "=m" (cw));
|
|
|
|
cw |= (_FPU_MASK_IM | _FPU_MASK_DM | _FPU_MASK_ZM | _FPU_MASK_OM
|
|
| _FPU_MASK_UM | _FPU_MASK_PM);
|
|
|
|
if (options.fpe & GFC_FPE_INVALID) cw &= ~_FPU_MASK_IM;
|
|
if (options.fpe & GFC_FPE_DENORMAL) cw &= ~_FPU_MASK_DM;
|
|
if (options.fpe & GFC_FPE_ZERO) cw &= ~_FPU_MASK_ZM;
|
|
if (options.fpe & GFC_FPE_OVERFLOW) cw &= ~_FPU_MASK_OM;
|
|
if (options.fpe & GFC_FPE_UNDERFLOW) cw &= ~_FPU_MASK_UM;
|
|
if (options.fpe & GFC_FPE_PRECISION) cw &= ~_FPU_MASK_PM;
|
|
|
|
asm volatile ("fldcw %0" : : "m" (cw));
|
|
|
|
if (has_sse())
|
|
{
|
|
unsigned int cw_sse;
|
|
|
|
asm volatile ("stmxcsr %0" : "=m" (cw_sse));
|
|
|
|
cw_sse &= 0xffff0000;
|
|
cw_sse |= (_FPU_MASK_IM | _FPU_MASK_DM | _FPU_MASK_ZM | _FPU_MASK_OM
|
|
| _FPU_MASK_UM | _FPU_MASK_PM ) << 7;
|
|
|
|
if (options.fpe & GFC_FPE_INVALID) cw_sse &= ~(_FPU_MASK_IM << 7);
|
|
if (options.fpe & GFC_FPE_DENORMAL) cw_sse &= ~(_FPU_MASK_DM << 7);
|
|
if (options.fpe & GFC_FPE_ZERO) cw_sse &= ~(_FPU_MASK_ZM << 7);
|
|
if (options.fpe & GFC_FPE_OVERFLOW) cw_sse &= ~(_FPU_MASK_OM << 7);
|
|
if (options.fpe & GFC_FPE_UNDERFLOW) cw_sse &= ~(_FPU_MASK_UM << 7);
|
|
if (options.fpe & GFC_FPE_PRECISION) cw_sse &= ~(_FPU_MASK_PM << 7);
|
|
|
|
asm volatile ("ldmxcsr %0" : : "m" (cw_sse));
|
|
}
|
|
}
|