[PATCH] D149174: [RISCV] Disable combineBinOpToReduce if the reduction AVL might be 0.
Craig Topper via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Apr 25 18:47:28 PDT 2023
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGe80da0f8409a: [RISCV] Disable combineBinOpToReduce if the reduction AVL might be 0. (authored by craig.topper).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D149174/new/
https://reviews.llvm.org/D149174
Files:
llvm/lib/Target/RISCV/RISCVISelLowering.cpp
Index: llvm/lib/Target/RISCV/RISCVISelLowering.cpp
===================================================================
--- llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -9170,6 +9170,11 @@
if (!ScalarV.hasOneUse())
return SDValue();
+ // If the AVL is zero, operand 0 will be returned. So it's not safe to fold.
+ // FIXME: We might be able to improve this if operand 0 is undef.
+ if (!isNonZeroAVL(Reduce.getOperand(5)))
+ return SDValue();
+
SDValue NewStart = N->getOperand(1 - ReduceIdx);
SDLoc DL(N);
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