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[MemoryLocation] Model value parameter of memset.pattern intrinsic #138559

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[MemoryLocation] Model value parameter of memset.pattern intrinsic #138559

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4 changes: 4 additions & 0 deletions llvm/lib/Analysis/MemoryLocation.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -186,6 +186,10 @@ MemoryLocation MemoryLocation::getForArgument(const CallBase *Call,
case Intrinsic::experimental_memset_pattern:
assert((ArgIdx == 0 || ArgIdx == 1) &&
"Invalid argument index for memory intrinsic");
if (ArgIdx == 1) {
assert(Arg->getType()->isPointerTy());
return MemoryLocation(Arg, LocationSize::precise(0), AATags);
}
if (ConstantInt *LenCI = dyn_cast<ConstantInt>(II->getArgOperand(2)))
return MemoryLocation(
Arg,
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7 changes: 2 additions & 5 deletions llvm/test/Transforms/GVN/memset-pattern.ll
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Expand Up @@ -49,11 +49,8 @@ define i32 @load_forward_over_memset_pattern(ptr %P, ptr noalias %Q) {

define i32 @load_forward_over_memset_pattern2(ptr %P, ptr noalias %Q) nounwind ssp {
; CHECK-LABEL: @load_forward_over_memset_pattern2(
; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[Q:%.*]], align 4
; CHECK-NEXT: tail call void @llvm.experimental.memset.pattern.p0.p0.i64(ptr [[P:%.*]], ptr [[Q]], i64 8, i1 false)
; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[Q]], align 4
; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[V1]], [[V2]]
; CHECK-NEXT: ret i32 [[SUB]]
; CHECK-NEXT: tail call void @llvm.experimental.memset.pattern.p0.p0.i64(ptr [[P:%.*]], ptr [[Q:%.*]], i64 8, i1 false)
; CHECK-NEXT: ret i32 0
;
%v1 = load i32, ptr %Q
tail call void @llvm.experimental.memset.pattern(ptr %P, ptr %Q, i64 8, i1 false)
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