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[RV64_DYNAREC] Optimized XOR Ew, Gw when Ew == Gw #1289

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Feb 27, 2024
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[RV64_DYNAREC] Optimized XOR Ew, Gw when Ew == Gw #1289

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70 changes: 62 additions & 8 deletions src/dynarec/rv64/dynarec_rv64_66.c
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Original file line number Diff line number Diff line change
Expand Up @@ -253,19 +253,73 @@ uintptr_t dynarec64_66(dynarec_rv64_t* dyn, uintptr_t addr, uintptr_t ip, int ni
INST_NAME("XOR Ew, Gw");
SETFLAGS(X_ALL, SF_SET_PENDING);
nextop = F8;
GETGW(x2);
GETEW(x1, 0);
emit_xor16(dyn, ninst, x1, x2, x4, x5, x6);
EWBACK;
// try to determine ed and gd
ed = 0;
GETGD;
if (MODREG) {
GETED(0);
}
if (ed == gd) {
// optimize XOR Gw, Gw
CLEAR_FLAGS();
IFX(X_PEND) {
SET_DF(x6, d_xor16);
} else IFX(X_ALL) {
SET_DFNONE();
}
SRLI(ed, ed, 16);
SLLI(ed, ed, 16);
IFX(X_PEND) {
SH(ed, xEmu, offsetof(x64emu_t, res));
}
IFX(X_ZF) {
ORI(xFlags, xFlags, 1 << F_ZF);
}
IFX(X_PF) {
ORI(xFlags, xFlags, 1 << F_PF);
}
} else {
GETGW(x2);
GETEW(x1, 0);
emit_xor16(dyn, ninst, x1, x2, x4, x5, x6);
EWBACK;
}
break;
case 0x33:
INST_NAME("XOR Gw, Ew");
SETFLAGS(X_ALL, SF_SET_PENDING);
nextop = F8;
GETGW(x1);
GETEW(x2, 0);
emit_xor16(dyn, ninst, x1, x2, x4, x5, x6);
GWBACK;
// try to determine ed and gd
ed = 0;
GETGD;
if (MODREG) {
GETED(0);
}
if (ed == gd) {
// optimize XOR Gw, Gw
CLEAR_FLAGS();
IFX(X_PEND) {
SET_DF(x6, d_xor16);
} else IFX(X_ALL) {
SET_DFNONE();
}
SRLI(ed, ed, 16);
SLLI(ed, ed, 16);
IFX(X_PEND) {
SH(ed, xEmu, offsetof(x64emu_t, res));
}
IFX(X_ZF) {
ORI(xFlags, xFlags, 1 << F_ZF);
}
IFX(X_PF) {
ORI(xFlags, xFlags, 1 << F_PF);
}
} else {
GETGW(x1);
GETEW(x2, 0);
emit_xor16(dyn, ninst, x1, x2, x4, x5, x6);
GWBACK;
}
break;
case 0x35:
INST_NAME("XOR AX, Iw");
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