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[INTERPRETER] Improve x87 comparison (backported from Box64)

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This commit is contained in:
ptitSeb 2024-12-04 10:25:46 +01:00
parent 1c280bd8a0
commit 512f0a6c92
1 changed files with 8 additions and 0 deletions
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8
src/emu/x87emu_private.h
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@ -84,6 +84,10 @@ static inline void fpu_fcom(x86emu_t* emu, double b)
emu->sw.f.F87_C0 = 1;
emu->sw.f.F87_C2 = 1;
emu->sw.f.F87_C3 = 1;
} else if ((b==-INFINITY) || (ST0.d==INFINITY)) {
emu->sw.f.F87_C0 = 0;
emu->sw.f.F87_C2 = 0;
emu->sw.f.F87_C3 = 0;
} else if (isgreater(ST0.d, b)) {
emu->sw.f.F87_C0 = 0;
emu->sw.f.F87_C2 = 0;
@ -111,6 +115,10 @@ static inline void fpu_fcomi(x86emu_t* emu, double b)
SET_FLAG(F_CF);
SET_FLAG(F_PF);
SET_FLAG(F_ZF);
} else if ((b==-INFINITY) || (ST0.d==INFINITY)) {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_PF);
CLEAR_FLAG(F_ZF);
} else if (isgreater(ST0.d, b)) {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_PF);