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-rw-r--r--llvm/lib/Analysis/InstructionSimplify.cpp9
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index 27c10ee..609cd26 100644
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -3991,6 +3991,15 @@ static Value *SimplifyIntrinsic(Function *F, IterTy ArgBegin, IterTy ArgEnd,
Q.DL);
}
+ // Simplify calls to llvm.masked.load.*
+ if (IID == Intrinsic::masked_load) {
+ IterTy MaskArg = ArgBegin + 2;
+ // If the mask is all zeros, the "passthru" argument is the result.
+ if (auto *ConstMask = dyn_cast<Constant>(*MaskArg))
+ if (ConstMask->isNullValue())
+ return ArgBegin[3];
+ }
+
// Perform idempotent optimizations
if (!IsIdempotent(IID))
return nullptr;