FEXCore: Fixes a crash with multiblock if ProcessorID IR op is encountered

If during multiblock code discovery a RDTSCP/RDPID instruction was
encountered then ProcessorID has an assert at JIT compile time. Make
sure to early exit with an illegal instruction encoding early instead.
Also make sure to correctly report RDPID support in CPUID, it's
technically a different bit than RDTSCP.

Fixes a crash in Crusader Kings 3's Paradox Launcher installer. Although
the installer seems to fail otherwise for some reason.
This commit is contained in:
Ryan Houdek committed 2026-07-08 17:41:03 -07:00
1 parent 5f2455c502
commit 9d18ecc5cb
2 files changed
+18 -2

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@@ -5037,7 +5037,11 @@ void OpDispatchBuilder::RDTSCPOp(OpcodeArgs) {
// - Explicitly use an MFENCE before this instruction if you want this behaviour
// This instruction is not an execution fence, so subsequent instructions can execute after this
// - Explicitly use an LFENCE after RDTSCP if you want to block this behaviour
if (CTX->HostFeatures.HostType != FEXCore::HostFeatures::HostTypeEnum::Linux && !CTX->HostFeatures.SupportsCPUIndexInTPIDRRO) {
// RDTSCP is unsupported on Win32 platforms if TPIDRRO isn't supported.
UnimplementedOp(Op);
return;
}
auto Counter = CycleCounter(true);
auto ID = _ProcessorID();
@@ -5047,6 +5051,11 @@ void OpDispatchBuilder::RDTSCPOp(OpcodeArgs) {
}
void OpDispatchBuilder::RDPIDOp(OpcodeArgs) {
if (CTX->HostFeatures.HostType != FEXCore::HostFeatures::HostTypeEnum::Linux && !CTX->HostFeatures.SupportsCPUIndexInTPIDRRO) {
// RDTSCP is unsupported on Win32 platforms if TPIDRRO isn't supported.
UnimplementedOp(Op);
return;
}
StoreResultGPR(Op, _ProcessorID());
}