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[RV64_DYNAREC] Fix POPCNT/TZCNT/LZCNT with 66h and rex.w prefix #4622

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Merged
ptitSeb merged 1 commit into from
Oct 28, 2026
Merged

[RV64_DYNAREC] Fix POPCNT/TZCNT/LZCNT with 66h and rex.w prefix #4622

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3 changes: 3 additions & 0 deletions src/dynarec/rv64/dynarec_rv64_66f30f.c
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@ uintptr_t dynarec64_66F30F(dynarec_rv64_t* dyn, uintptr_t addr, uintptr_t ip, in

switch (opcode) {
case 0xB8:
if (rex.w) return dynarec64_F30F(dyn, addr - 1, ip, ninst, rex, ok, need_epilog);
INST_NAME("POPCNT Gw, Ew");
SETFLAGS(X_ALL, SF_SET_NODF, NAT_FLAGS_NOFUSION);
SET_DFNONE();
Expand Down Expand Up @@ -91,6 +92,7 @@ uintptr_t dynarec64_66F30F(dynarec_rv64_t* dyn, uintptr_t addr, uintptr_t ip, in
GWBACK;
break;
case 0xBC:
if (rex.w) return dynarec64_F30F(dyn, addr - 1, ip, ninst, rex, ok, need_epilog);
INST_NAME("TZCNT Gw, Ew");
if (!BOX64DRENV(dynarec_safeflags)) {
SETFLAGS(X_CF | X_ZF, SF_SUBSET, NAT_FLAGS_NOFUSION);
Expand Down Expand Up @@ -123,6 +125,7 @@ uintptr_t dynarec64_66F30F(dynarec_rv64_t* dyn, uintptr_t addr, uintptr_t ip, in
GWBACK;
break;
case 0xBD:
if (rex.w) return dynarec64_F30F(dyn, addr - 1, ip, ninst, rex, ok, need_epilog);
INST_NAME("LZCNT Gw, Ew");
if (!BOX64DRENV(dynarec_safeflags)) {
SETFLAGS(X_CF | X_ZF, SF_SUBSET, NAT_FLAGS_NOFUSION);
Expand Down
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