================
@@ -8891,6 +8964,43 @@ SDValue SystemZTargetLowering::combineBR_CCMASK(SDNode
*N,
DAG.getTargetConstant(CCValidVal, SDLoc(N), MVT::i32),
DAG.getTargetConstant(CCMaskVal, SDLoc(N), MVT::i32),
N->getOperand(3), CCReg);
+
+ SDLoc DL(N);
+
+ // Combine BR_CCMASK (ICMP (Load FI, Load StackGuard)) into BRC
+ // (COMPARE_STACK_GUARD)
+ int FI = 0;
+ SDValue InChain, OutChain, StackGuardLoad;
+ if (isStackGuardCheck(N, FI, InChain, OutChain, StackGuardLoad, DCI)) {
----------------
uweigand wrote:
I don't understand why this needs to be done in combineBR_CCMASK - and why the
branch needs to be touched at all. Shouldn't we simply be able to replace the
ICMP with COMPARE_STACK_GUARD_DAG either in a (to be added) combineICMP
routine, or even just emit it this way from the beginning in getCmp/emitCmp?
https://github.com/llvm/llvm-project/pull/169317
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