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Added quick hack to FCOMPP to fix 80387 detection. Quake (and presumably some other stuff) works in Windows again.

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TomW 2013-12-15 15:41:29 +00:00
commit 6c631adc7e
1 changed files with 6 additions and 2 deletions
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8
src/x87.c
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@ -1237,8 +1237,12 @@ void x87_de()
case 0xD9: /*FCOMPP*/
if (fplog) pclog("FCOMPP %f %f\n", ST(0), ST(1));
npxs&=~(C0|C2|C3);
if (ST(0)==ST(1)) npxs|=C3;
else if (ST(0)<ST(1)) npxs|=C0;
if (*(uint64_t *)&ST(0) == ((uint64_t)1 << 63) && *(uint64_t *)&ST(1) == 0)
npxs |= C0; /*Nasty hack to fix 80387 detection*/
else if (ST(0) == ST(1))
npxs |= C3;
else if (ST(0) < ST(1))
npxs |= C0;
x87_pop();
x87_pop();
cycles-=5;