================
@@ -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)) {
----------------
dominik-steenken wrote:
That was the way i tried to do it initially - replacing `ICMP` with
`COMPARE_STACK_GUARD` seemed to make the most sense. .But i had a lot of
trouble getting the cc def/use to work. Ultimately, it was easier to do it on
the branch, so that i could manually make that link. It's been a while, so i am
a bit fuzzy on the details.
I will try the third way you mentioned now, though. If i can emit
`COMPARE_STACK_GUARD_DAG` in `getCmp`, and the whole machinery after that just
works, that would be ideal.
https://github.com/llvm/llvm-project/pull/169317
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