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FPU: Re-enabled SoftFloat on 808x and implement the missing FBLD instruction, closes #4300.

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This commit is contained in:
OBattler
2024-03-25 19:59:26 +01:00
parent 31dee950ab
commit 0b0cb84bf7
4 changed files with 278 additions and 67 deletions
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85
src/cpu/808x.c
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@@ -3196,31 +3196,66 @@ execx86(int cycs)
if (!hasfpu)
geteaw();
else
switch (opcode) {
case 0xD8:
ops_fpu_8087_d8[(rmdat >> 3) & 0x1f]((uint32_t) rmdat);
break;
case 0xD9:
ops_fpu_8087_d9[rmdat & 0xff]((uint32_t) rmdat);
break;
case 0xDA:
ops_fpu_8087_da[rmdat & 0xff]((uint32_t) rmdat);
break;
case 0xDB:
ops_fpu_8087_db[rmdat & 0xff]((uint32_t) rmdat);
break;
case 0xDC:
ops_fpu_8087_dc[(rmdat >> 3) & 0x1f]((uint32_t) rmdat);
break;
case 0xDD:
ops_fpu_8087_dd[rmdat & 0xff]((uint32_t) rmdat);
break;
case 0xDE:
ops_fpu_8087_de[rmdat & 0xff]((uint32_t) rmdat);
break;
case 0xDF:
ops_fpu_8087_df[rmdat & 0xff]((uint32_t) rmdat);
break;
if (fpu_softfloat) {
switch (opcode) {
case 0xD8:
ops_sf_fpu_8087_d8[(rmdat >> 3) & 0x1f](rmdat);
break;
case 0xD9:
ops_sf_fpu_8087_d9[rmdat & 0xff](rmdat);
break;
case 0xDA:
ops_sf_fpu_8087_da[rmdat & 0xff](rmdat);
break;
case 0xDB:
ops_sf_fpu_8087_db[rmdat & 0xff](rmdat);
break;
case 0xDC:
ops_sf_fpu_8087_dc[(rmdat >> 3) & 0x1f](rmdat);
break;
case 0xDD:
ops_sf_fpu_8087_dd[rmdat & 0xff](rmdat);
break;
case 0xDE:
ops_sf_fpu_8087_de[rmdat & 0xff](rmdat);
break;
case 0xDF:
ops_sf_fpu_8087_df[rmdat & 0xff](rmdat);
break;
default:
break;
}
} else {
switch (opcode) {
case 0xD8:
ops_fpu_8087_d8[(rmdat >> 3) & 0x1f](rmdat);
break;
case 0xD9:
ops_fpu_8087_d9[rmdat & 0xff](rmdat);
break;
case 0xDA:
ops_fpu_8087_da[rmdat & 0xff](rmdat);
break;
case 0xDB:
ops_fpu_8087_db[rmdat & 0xff](rmdat);
break;
case 0xDC:
ops_fpu_8087_dc[(rmdat >> 3) & 0x1f](rmdat);
break;
case 0xDD:
ops_fpu_8087_dd[rmdat & 0xff](rmdat);
break;
case 0xDE:
ops_fpu_8087_de[rmdat & 0xff](rmdat);
break;
case 0xDF:
ops_fpu_8087_df[rmdat & 0xff](rmdat);
break;
default:
break;
}
}
cpu_state.pc = tempw; /* Do this as the x87 code advances it, which is needed on
the 286+ core, but not here. */