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Implement Cyrix EMMI extensions and 4 FPU instructions

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PADDSIW, PSUBSIW, PMULHRW (named PMULHRWC in the code as recognized by some assemblers), PMULHRIW, PDISTIB, PMACHRIW, PAVEB, PMAGW, PMVZB, PMVNZB, PMVLZB, PMVGEZB, FTSTP, FRINT2, FRINEAR, FRICHOP are implemented for Cyrix 6x86MX. Cyrix 6x86(L) only has the last 4 instructions.
This commit is contained in:
Cacodemon345
2025-03-06 00:54:28 +06:00
parent 6a380af6bb
commit 5f3641ecbd
10 changed files with 1723 additions and 20 deletions
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26
src/cpu/x87_ops_sf_compare.h
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@@ -459,6 +459,32 @@ sf_FTST(uint32_t fetchdat)
return 0;
}
static int
sf_FTSTP(uint32_t fetchdat)
{
const floatx80 Const_Z = packFloatx80(0, 0x0000, 0);
struct softfloat_status_t status;
int rc;
FP_ENTER();
FPU_check_pending_exceptions();
cpu_state.pc++;
clear_C1();
if (IS_TAG_EMPTY(0)) {
FPU_exception(fetchdat, FPU_EX_Stack_Underflow, 0);
setcc(FPU_SW_C0 | FPU_SW_C2 | FPU_SW_C3);
} else {
status = i387cw_to_softfloat_status_word(i387_get_control_word());
rc = extF80_compare_normal(FPU_read_regi(0), Const_Z, &status);
setcc(FPU_status_word_flags_fpu_compare(rc));
FPU_exception(fetchdat, status.softfloat_exceptionFlags, 0);
FPU_pop();
}
CLOCK_CYCLES_FPU((fpu_type >= FPU_487SX) ? (x87_timings.ftst) : (x87_timings.ftst * cpu_multi));
CONCURRENCY_CYCLES((fpu_type >= FPU_487SX) ? (x87_concurrency.ftst) : (x87_concurrency.ftst * cpu_multi));
return 0;
}
static int
sf_FXAM(UNUSED(uint32_t fetchdat))
{