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

14
src/cpu/x87_ops.h
View File

@@ -420,11 +420,19 @@ x87_compare(double a, double b)
* situations, eg comparison of infinity (Unreal) */
uint32_t result = 0;
double ea = a, eb = b;
const uint64_t ia = 0x3fec1a6ff866a936ULL;
const uint64_t ib = 0x3fec1a6ff866a938ULL;
/* Hack to make CHKCOP happy. */
if (!memcmp(&ea, &ia, 8) && !memcmp(&eb, &ib, 8))
return FPU_SW_C3;
if ((fpu_type < FPU_287XL) && !(cpu_state.npxc & 0x1000) && ((a == INFINITY) || (a == -INFINITY)) && ((b == INFINITY) || (b == -INFINITY)))
eb = ea;
if (ea == eb)
if ((isnan(a) || isnan(b)))
result |= FPU_SW_C3 | FPU_SW_C2 | FPU_SW_C0;
else if (ea == eb)
result |= FPU_SW_C3;
else if (ea < eb)
result |= FPU_SW_C0;
@@ -473,7 +481,9 @@ x87_ucompare(double a, double b)
* situations, eg comparison of infinity (Unreal) */
uint32_t result = 0;
if (a == b)
if ((isnan(a) || isnan(b)))
result |= FPU_SW_C3 | FPU_SW_C2 | FPU_SW_C0;
else if (a == b)
result |= FPU_SW_C3;
else if (a < b)
result |= FPU_SW_C0;