claunia/86Box
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Use fpclassify for FXAM instead of manual comparison

Browse Source 
NaN detection for interpreter floating point compare on ARM64
This commit is contained in:
Cacodemon345
2025-03-16 23:33:40 +06:00
parent 371866063b
commit 271a125301
2 changed files with 30 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
src/cpu/x87_ops_misc.h
View File

@@ -585,10 +585,24 @@ opFXAM(UNUSED(uint32_t fetchdat))
if (cpu_state.tag[cpu_state.TOP & 7] == 3)
cpu_state.npxs |= (FPU_SW_C0 | FPU_SW_C3);
#endif
else if (ST(0) == 0.0)
cpu_state.npxs |= FPU_SW_C3;
else
cpu_state.npxs |= FPU_SW_C2;
else switch (fpclassify(ST(0)))
{
case FP_SUBNORMAL:
cpu_state.npxs |= FPU_SW_C2 | FPU_SW_C3;
break;
case FP_NAN:
cpu_state.npxs |= FPU_SW_C0;
break;
case FP_INFINITE:
cpu_state.npxs |= FPU_SW_C0 | FPU_SW_C2;
break;
case FP_ZERO:
cpu_state.npxs |= FPU_SW_C3;
break;
case FP_NORMAL:
cpu_state.npxs |= FPU_SW_C2;
break;
}
if (ST(0) < 0.0)
cpu_state.npxs |= FPU_SW_C1;
CLOCK_CYCLES_FPU((fpu_type >= FPU_487SX) ? (x87_timings.fxam) : (x87_timings.fxam * cpu_multi));