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msvcrt: Don't change FPU control word in _control87() on x86-64. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2019-11-02 14:35:52 +01:00
parent 6a0e0001ef
commit 0e183cc3c0
1 changed files with 45 additions and 2 deletions
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47
dlls/msvcrt/math.c
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@ -1087,7 +1087,7 @@ double CDECL MSVCRT__chgsign(double num)
*
* Not exported by native msvcrt, added in msvcr80.
*/
#if defined(__i386__) || defined(__x86_64__)
#ifdef __i386__
int CDECL __control87_2( unsigned int newval, unsigned int mask,
unsigned int *x86_cw, unsigned int *sse2_cw )
{
@ -1225,12 +1225,55 @@ int CDECL __control87_2( unsigned int newval, unsigned int mask,
unsigned int CDECL _control87(unsigned int newval, unsigned int mask)
{
unsigned int flags = 0;
#if defined(__i386__) || defined(__x86_64__)
#ifdef __i386__
unsigned int sse2_cw;
__control87_2( newval, mask, &flags, &sse2_cw );
if ((flags ^ sse2_cw) & (MSVCRT__MCW_EM | MSVCRT__MCW_RC)) flags |= MSVCRT__EM_AMBIGUOUS;
#elif defined(__x86_64__)
unsigned long fpword;
__asm__ __volatile__( "stmxcsr %0" : "=m" (fpword) );
if (fpword & 0x80) flags |= MSVCRT__EM_INVALID;
if (fpword & 0x100) flags |= MSVCRT__EM_DENORMAL;
if (fpword & 0x200) flags |= MSVCRT__EM_ZERODIVIDE;
if (fpword & 0x400) flags |= MSVCRT__EM_OVERFLOW;
if (fpword & 0x800) flags |= MSVCRT__EM_UNDERFLOW;
if (fpword & 0x1000) flags |= MSVCRT__EM_INEXACT;
switch (fpword & 0x6000)
{
case 0x6000: flags |= MSVCRT__RC_CHOP; break;
case 0x4000: flags |= MSVCRT__RC_UP; break;
case 0x2000: flags |= MSVCRT__RC_DOWN; break;
}
switch (fpword & 0x8040)
{
case 0x0040: flags |= MSVCRT__DN_FLUSH_OPERANDS_SAVE_RESULTS; break;
case 0x8000: flags |= MSVCRT__DN_SAVE_OPERANDS_FLUSH_RESULTS; break;
case 0x8040: flags |= MSVCRT__DN_FLUSH; break;
}
flags = (flags & ~mask) | (newval & mask);
fpword = 0;
if (flags & MSVCRT__EM_INVALID) fpword |= 0x80;
if (flags & MSVCRT__EM_DENORMAL) fpword |= 0x100;
if (flags & MSVCRT__EM_ZERODIVIDE) fpword |= 0x200;
if (flags & MSVCRT__EM_OVERFLOW) fpword |= 0x400;
if (flags & MSVCRT__EM_UNDERFLOW) fpword |= 0x800;
if (flags & MSVCRT__EM_INEXACT) fpword |= 0x1000;
switch (flags & MSVCRT__MCW_RC)
{
case MSVCRT__RC_CHOP: fpword |= 0x6000; break;
case MSVCRT__RC_UP: fpword |= 0x4000; break;
case MSVCRT__RC_DOWN: fpword |= 0x2000; break;
}
switch (flags & MSVCRT__MCW_DN)
{
case MSVCRT__DN_FLUSH_OPERANDS_SAVE_RESULTS: fpword |= 0x0040; break;
case MSVCRT__DN_SAVE_OPERANDS_FLUSH_RESULTS: fpword |= 0x8000; break;
case MSVCRT__DN_FLUSH: fpword |= 0x8040; break;
}
__asm__ __volatile__( "ldmxcsr %0" :: "m" (fpword) );
#elif defined(__aarch64__)
unsigned long fpcr;