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* fenv.cc (_feinitialise); Don't use SSE instructions on systems not

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supporting them.
	* wincap.h (wincaps::supports_sse): New element.
	* wincap.cc: Implement above element throughout.
This commit is contained in:
Corinna Vinschen
2011-03-20 15:34:29 +00:00
parent b8bdc60019
commit 33150e7f40
4 changed files with 25 additions and 4 deletions
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11
winsup/cygwin/fenv.cc
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@@ -1,6 +1,6 @@
/* fenv.cc
Copyright 2010 Red Hat, Inc.
Copyright 2010, 2011 Red Hat, Inc.
This file is part of Cygwin.
@@ -8,9 +8,11 @@ This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include <string.h>
#include "winsup.h"
#include "fenv.h"
#include "errno.h"
#include "wincap.h"
#include <string.h>
/* Mask and shift amount for rounding bits. */
#define FE_CW_ROUND_MASK (0x0c00)
@@ -419,8 +421,9 @@ _feinitialise (void)
/* Check for presence of SSE: invoke CPUID #1, check EDX bit 25. */
eax = 1;
__asm__ volatile ("cpuid" : "=d" (edx), "+a" (eax) :: "%ecx", "%ebx");
/* If this flag isn't set, we'll avoid trying to execute any SSE. */
if (edx & (1 << 25))
/* If this flag isn't set, or if the OS doesn't support SSE (NT4, at least
up to SP4) we'll avoid trying to execute any SSE. */
if ((edx & (1 << 25)) != 0 && wincap.supports_sse ())
use_sse = true;
/* Reset FPU: extended prec, all exceptions cleared and masked off. */