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Workaround WSL misconfiguring the x87 FPU

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Justine Tunney 2022-11-02 02:17:14 -07:00
parent f44d88707e
commit d6ff4c754e
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GPG key ID: BE714B4575D6E328
2 changed files with 26 additions and 19 deletions
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19
libc/runtime/winmain.greg.c
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@ -76,24 +76,6 @@ static const short kConsoleModes[3] = {
kNtEnableVirtualTerminalProcessing,
};
forceinline void MakeLongDoubleLongAgain(void) {
/* 8087 FPU Control Word
IM: Invalid Operation ───────────────┐
DM: Denormal Operand ───────────────┐│
ZM: Zero Divide ───────────────────┐││
OM: Overflow ─────────────────────┐│││
UM: Underflow ───────────────────┐││││
PM: Precision ──────────────────┐│││││
PC: Precision Control ────────┐ ││││││
{float,∅,double,long double} │ ││││││
RC: Rounding Control ───────┐ │ ││││││
{even, →-∞, →+∞, →0} │┌┤ ││││││
┌┤││ ││││││
d││││rr││││││*/
int x87cw = 0b0000000000000000001101111111;
asm volatile("fldcw\t%0" : /* no outputs */ : "m"(x87cw));
}
// https://nullprogram.com/blog/2022/02/18/
static inline char16_t *MyCommandLine(void) {
void *cmd;
@ -259,7 +241,6 @@ __msabi textwindows int64_t WinMain(int64_t hInstance, int64_t hPrevInstance,
if (__strstr16(cmdline, u"--strace")) ++__strace;
#endif
NTTRACE("WinMain()");
MakeLongDoubleLongAgain();
if (_weaken(WinSockInit)) _weaken(WinSockInit)();
if (_weaken(WinMainForked)) _weaken(WinMainForked)();
WinMainNew(cmdline);