[llvm] [InferAddressSpaces] Handle llvm.lifetime (PR #141045)
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Thu May 22 04:50:11 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-transforms
Author: QiYue (QiYueFeiXue)
<details>
<summary>Changes</summary>
---
Full diff: https://github.com/llvm/llvm-project/pull/141045.diff
3 Files Affected:
- (modified) llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp (+14)
- (added) llvm/test/Transforms/InferAddressSpaces/AMDGPU/lifetime.ll (+23)
- (added) llvm/test/Transforms/InferAddressSpaces/NVPTX/lifetime.ll (+24)
``````````diff
diff --git a/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp b/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
index 1b7cecc7ceb6a..66836ef05d5db 100644
--- a/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
+++ b/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
@@ -428,6 +428,14 @@ bool InferAddressSpacesImpl::rewriteIntrinsicOperands(IntrinsicInst *II,
II->replaceUsesOfWith(OldV, NewV);
return true;
}
+ case Intrinsic::lifetime_start:
+ case Intrinsic::lifetime_end: {
+ Function *NewDecl = Intrinsic::getOrInsertDeclaration(
+ M, II->getIntrinsicID(), {NewV->getType()});
+ II->setArgOperand(1, NewV);
+ II->setCalledFunction(NewDecl);
+ return true;
+ }
default: {
Value *Rewrite = TTI->rewriteIntrinsicWithAddressSpace(II, OldV, NewV);
if (!Rewrite)
@@ -479,6 +487,12 @@ void InferAddressSpacesImpl::collectRewritableIntrinsicOperands(
break;
}
+ case Intrinsic::lifetime_start:
+ case Intrinsic::lifetime_end: {
+ appendsFlatAddressExpressionToPostorderStack(II->getArgOperand(1),
+ PostorderStack, Visited);
+ break;
+ }
default:
SmallVector<int, 2> OpIndexes;
if (TTI->collectFlatAddressOperands(OpIndexes, IID)) {
diff --git a/llvm/test/Transforms/InferAddressSpaces/AMDGPU/lifetime.ll b/llvm/test/Transforms/InferAddressSpaces/AMDGPU/lifetime.ll
new file mode 100644
index 0000000000000..291faa7ea9ef4
--- /dev/null
+++ b/llvm/test/Transforms/InferAddressSpaces/AMDGPU/lifetime.ll
@@ -0,0 +1,23 @@
+; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -passes=infer-address-spaces %s | FileCheck %s
+
+
+define i32 @lifetime_flat_pointer() {
+; CHECK-LABEL: define i32 @lifetime_flat_pointer() {
+; CHECK-NEXT: [[ALLOCA:%.*]] = alloca i32, align 4, addrspace(5)
+; CHECK-NEXT: call void @llvm.lifetime.start.p5(i64 4, ptr addrspace(5) [[ALLOCA]])
+; CHECK-NEXT: store i32 1, ptr addrspace(5) [[ALLOCA]], align 4
+; CHECK-NEXT: %ret = load i32, ptr addrspace(5) [[ALLOCA]], align 4
+; CHECK-NEXT: call void @llvm.lifetime.end.p5(i64 4, ptr addrspace(5) [[ALLOCA]])
+; CHECK-NEXT: ret i32 %ret
+;
+ %alloca = alloca i32, align 4, addrspace(5)
+ %flat = addrspacecast ptr addrspace(5) %alloca to ptr
+ call void @llvm.lifetime.start.p0(i64 4 , ptr %flat)
+ store i32 1, ptr %flat, align 4
+ %ret = load i32, ptr %flat, align 4
+ call void @llvm.lifetime.end.p0(i64 4 , ptr %flat)
+ ret i32 %ret
+}
+
+declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture)
+declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture)
\ No newline at end of file
diff --git a/llvm/test/Transforms/InferAddressSpaces/NVPTX/lifetime.ll b/llvm/test/Transforms/InferAddressSpaces/NVPTX/lifetime.ll
new file mode 100644
index 0000000000000..05e46456c8bf9
--- /dev/null
+++ b/llvm/test/Transforms/InferAddressSpaces/NVPTX/lifetime.ll
@@ -0,0 +1,24 @@
+; RUN: opt -S -passes=infer-address-spaces %s | FileCheck %s
+
+target triple = "nvptx64-nvidia-cuda"
+
+define i32 @lifetime_flat_pointer() {
+; CHECK-LABEL: define i32 @lifetime_flat_pointer() {
+; CHECK-NEXT: [[ALLOCA:%.*]] = alloca i32, align 4, addrspace(5)
+; CHECK-NEXT: call void @llvm.lifetime.start.p5(i64 4, ptr addrspace(5) [[ALLOCA]])
+; CHECK-NEXT: store i32 1, ptr addrspace(5) [[ALLOCA]], align 4
+; CHECK-NEXT: %ret = load i32, ptr addrspace(5) [[ALLOCA]], align 4
+; CHECK-NEXT: call void @llvm.lifetime.end.p5(i64 4, ptr addrspace(5) [[ALLOCA]])
+; CHECK-NEXT: ret i32 %ret
+;
+ %alloca = alloca i32, align 4, addrspace(5)
+ %flat = addrspacecast ptr addrspace(5) %alloca to ptr
+ call void @llvm.lifetime.start.p0(i64 4 , ptr %flat)
+ store i32 1, ptr %flat, align 4
+ %ret = load i32, ptr %flat, align 4
+ call void @llvm.lifetime.end.p0(i64 4 , ptr %flat)
+ ret i32 %ret
+}
+
+declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture)
+declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture)
``````````
</details>
https://github.com/llvm/llvm-project/pull/141045
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