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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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77
src/cpu/x87_ops_misc.h
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@@ -554,6 +554,22 @@ opFTST(UNUSED(uint32_t fetchdat))
return 0;
}
static int
opFTSTP(UNUSED(uint32_t fetchdat))
{
FP_ENTER();
cpu_state.pc++;
cpu_state.npxs &= ~(FPU_SW_C0 | FPU_SW_C2 | FPU_SW_C3);
if (ST(0) == 0.0)
cpu_state.npxs |= FPU_SW_C3;
else if (ST(0) < 0.0)
cpu_state.npxs |= FPU_SW_C0;
x87_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
opFXAM(UNUSED(uint32_t fetchdat))
{
@@ -838,6 +854,67 @@ opFRNDINT(UNUSED(uint32_t fetchdat))
return 0;
}
static int
opFRINT2(UNUSED(uint32_t fetchdat))
{
double dst0, st0, integral, frac;
int prevRound;
FP_ENTER();
cpu_state.pc++;
prevRound = fegetround();
fesetround(FE_TONEAREST);
st0 = ST(0);
frac = modf(st0, &integral);
if (frac == 0.5 || frac == -0.5) {
dst0 = (st0 < 0) ? floor(st0) : ceil(st0);
} else {
dst0 = round(st0);
}
fesetround(prevRound);
ST(0) = (double) dst0;
FP_TAG_VALID;
CLOCK_CYCLES_FPU((fpu_type >= FPU_487SX) ? (x87_timings.frndint) : (x87_timings.frndint * cpu_multi));
CONCURRENCY_CYCLES((fpu_type >= FPU_487SX) ? (x87_concurrency.frndint) : (x87_concurrency.frndint * cpu_multi));
return 0;
}
static int
opFRINEAR(UNUSED(uint32_t fetchdat))
{
double dst0, st0, integral, frac;
int prevRound;
FP_ENTER();
cpu_state.pc++;
prevRound = fegetround();
fesetround(FE_TONEAREST);
ST(0) = (double) x87_fround_nearest(ST(0));
fesetround(prevRound);
FP_TAG_VALID;
CLOCK_CYCLES_FPU((fpu_type >= FPU_487SX) ? (x87_timings.frndint) : (x87_timings.frndint * cpu_multi));
CONCURRENCY_CYCLES((fpu_type >= FPU_487SX) ? (x87_concurrency.frndint) : (x87_concurrency.frndint * cpu_multi));
return 0;
}
static int
opFRICHOP(UNUSED(uint32_t fetchdat))
{
double dst0, st0, integral, frac;
int prevRound;
FP_ENTER();
cpu_state.pc++;
prevRound = fegetround();
fesetround(FE_TONEAREST);
ST(0) = (double) ((int64_t)(ST(0)));
fesetround(prevRound);
FP_TAG_VALID;
CLOCK_CYCLES_FPU((fpu_type >= FPU_487SX) ? (x87_timings.frndint) : (x87_timings.frndint * cpu_multi));
CONCURRENCY_CYCLES((fpu_type >= FPU_487SX) ? (x87_concurrency.frndint) : (x87_concurrency.frndint * cpu_multi));
return 0;
}
static int
opFSCALE(UNUSED(uint32_t fetchdat))
{