================
@@ -161,6 +163,40 @@ void RegAllocBase::postOptimization() {
DeadRemats.clear();
}
+void RegAllocBase::cleanupFailedVRegs() {
+ SmallSet<Register, 8> JunkRegs;
+
+ for (Register FailedReg : FailedVRegs) {
+ JunkRegs.insert(FailedReg);
+
+ MCRegister PhysReg = VRM->getPhys(FailedReg);
+ LiveInterval &FailedInterval = LIS->getInterval(FailedReg);
+
+ // The liveness information for the failed register and anything
interfering
+ // with the physical register we arbitrarily chose is junk and needs to be
+ // deleted.
+ for (MCRegUnitIterator Units(PhysReg, TRI); Units.isValid(); ++Units) {
+ LiveIntervalUnion::Query &Q = Matrix->query(FailedInterval, *Units);
+ for (const LiveInterval *InterferingReg : Q.interferingVRegs())
+ JunkRegs.insert(InterferingReg->reg());
+ }
+ }
+
+ // TODO: Probably need to set undef on any physreg uses not associated with
+ // a virtual register.
----------------
ilovepi wrote:
Aren't there places where we lower things/expand pseudos using physical regs
before RegAlloc? We do some weird things for stuff like TLSDESC where ABI
dictates we use particular registers. It's not a problem in this patch, but I
want to understand better if we're doing things we shouldn't in the various
lowerings and should consider addressing that.
https://github.com/llvm/llvm-project/pull/119690
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