[llvm] fbd2a91 - InferAddressSpaces: Handle llvm.fake.use (#109567)
via llvm-commits
llvm-commits at lists.llvm.org
Tue Oct 8 22:24:41 PDT 2024
Author: Matt Arsenault
Date: 2024-10-09T09:24:37+04:00
New Revision: fbd2a918652894b31199dffe1ce5335b019332d7
URL: https://github.com/llvm/llvm-project/commit/fbd2a918652894b31199dffe1ce5335b019332d7
DIFF: https://github.com/llvm/llvm-project/commit/fbd2a918652894b31199dffe1ce5335b019332d7.diff
LOG: InferAddressSpaces: Handle llvm.fake.use (#109567)
Added:
llvm/test/Transforms/InferAddressSpaces/fake-use.ll
Modified:
llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
Removed:
################################################################################
diff --git a/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp b/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
index 566cdc51f6e74a..60fd2a286119b3 100644
--- a/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
+++ b/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
@@ -414,6 +414,10 @@ bool InferAddressSpacesImpl::rewriteIntrinsicOperands(IntrinsicInst *II,
II->setCalledFunction(NewDecl);
return true;
}
+ case Intrinsic::fake_use: {
+ II->replaceUsesOfWith(OldV, NewV);
+ return true;
+ }
default: {
Value *Rewrite = TTI->rewriteIntrinsicWithAddressSpace(II, OldV, NewV);
if (!Rewrite)
@@ -455,6 +459,16 @@ void InferAddressSpacesImpl::collectRewritableIntrinsicOperands(
appendsFlatAddressExpressionToPostorderStack(II->getArgOperand(1),
PostorderStack, Visited);
break;
+ case Intrinsic::fake_use: {
+ for (Value *Op : II->operands()) {
+ if (Op->getType()->isPtrOrPtrVectorTy()) {
+ appendsFlatAddressExpressionToPostorderStack(Op, PostorderStack,
+ Visited);
+ }
+ }
+
+ break;
+ }
default:
SmallVector<int, 2> OpIndexes;
if (TTI->collectFlatAddressOperands(OpIndexes, IID)) {
diff --git a/llvm/test/Transforms/InferAddressSpaces/fake-use.ll b/llvm/test/Transforms/InferAddressSpaces/fake-use.ll
new file mode 100644
index 00000000000000..ad7f621dc40e85
--- /dev/null
+++ b/llvm/test/Transforms/InferAddressSpaces/fake-use.ll
@@ -0,0 +1,97 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -S -passes=infer-address-spaces -assume-default-is-flat-addrspace %s | FileCheck %s
+
+declare void @llvm.fake.use(...)
+
+ at gv = internal addrspace(3) global float 0.0, align 4
+
+define void @one_fake_use(ptr addrspace(1) %global.ptr) {
+; CHECK-LABEL: define void @one_fake_use(
+; CHECK-SAME: ptr addrspace(1) [[GLOBAL_PTR:%.*]]) {
+; CHECK-NEXT: call void (...) @llvm.fake.use(ptr addrspace(1) [[GLOBAL_PTR]])
+; CHECK-NEXT: ret void
+;
+ %cast0 = addrspacecast ptr addrspace(1) %global.ptr to ptr
+ call void (...) @llvm.fake.use(ptr %cast0)
+ ret void
+}
+
+define void @one_fake_use_repeat_operands(ptr addrspace(1) %global.ptr) {
+; CHECK-LABEL: define void @one_fake_use_repeat_operands(
+; CHECK-SAME: ptr addrspace(1) [[GLOBAL_PTR:%.*]]) {
+; CHECK-NEXT: call void (...) @llvm.fake.use(ptr addrspace(1) [[GLOBAL_PTR]], ptr addrspace(1) [[GLOBAL_PTR]])
+; CHECK-NEXT: ret void
+;
+ %cast0 = addrspacecast ptr addrspace(1) %global.ptr to ptr
+ call void (...) @llvm.fake.use(ptr %cast0, ptr %cast0)
+ ret void
+}
+
+define void @one_fake_use_refers_original_ptr(ptr addrspace(1) %global.ptr) {
+; CHECK-LABEL: define void @one_fake_use_refers_original_ptr(
+; CHECK-SAME: ptr addrspace(1) [[GLOBAL_PTR:%.*]]) {
+; CHECK-NEXT: call void (...) @llvm.fake.use(ptr addrspace(1) [[GLOBAL_PTR]], ptr addrspace(1) [[GLOBAL_PTR]])
+; CHECK-NEXT: ret void
+;
+ %cast0 = addrspacecast ptr addrspace(1) %global.ptr to ptr
+ call void (...) @llvm.fake.use(ptr %cast0, ptr addrspace(1) %global.ptr)
+ ret void
+}
+
+define void @multiple_inferrable_fake_use(ptr addrspace(1) %global.ptr0, ptr addrspace(1) %global.ptr1) {
+; CHECK-LABEL: define void @multiple_inferrable_fake_use(
+; CHECK-SAME: ptr addrspace(1) [[GLOBAL_PTR0:%.*]], ptr addrspace(1) [[GLOBAL_PTR1:%.*]]) {
+; CHECK-NEXT: call void (...) @llvm.fake.use(ptr addrspace(1) [[GLOBAL_PTR0]], ptr addrspace(1) [[GLOBAL_PTR1]])
+; CHECK-NEXT: ret void
+;
+ %cast0 = addrspacecast ptr addrspace(1) %global.ptr0 to ptr
+ %cast1 = addrspacecast ptr addrspace(1) %global.ptr1 to ptr
+ call void (...) @llvm.fake.use(ptr %cast0, ptr %cast1)
+ ret void
+}
+
+define void @multiple_fake_use_one_inferrable(ptr %flat.ptr0, ptr addrspace(1) %global.ptr1) {
+; CHECK-LABEL: define void @multiple_fake_use_one_inferrable(
+; CHECK-SAME: ptr [[FLAT_PTR0:%.*]], ptr addrspace(1) [[GLOBAL_PTR1:%.*]]) {
+; CHECK-NEXT: call void (...) @llvm.fake.use(ptr [[FLAT_PTR0]], ptr addrspace(1) [[GLOBAL_PTR1]])
+; CHECK-NEXT: call void (...) @llvm.fake.use(ptr addrspace(1) [[GLOBAL_PTR1]], ptr [[FLAT_PTR0]])
+; CHECK-NEXT: ret void
+;
+ %cast1 = addrspacecast ptr addrspace(1) %global.ptr1 to ptr
+ call void (...) @llvm.fake.use(ptr %flat.ptr0, ptr %cast1)
+ call void (...) @llvm.fake.use(ptr %cast1, ptr %flat.ptr0)
+ ret void
+}
+
+define void @vector_of_pointers(<2 x ptr addrspace(1)> %global.ptr) {
+; CHECK-LABEL: define void @vector_of_pointers(
+; CHECK-SAME: <2 x ptr addrspace(1)> [[GLOBAL_PTR:%.*]]) {
+; CHECK-NEXT: call void (...) @llvm.fake.use(<2 x ptr addrspace(1)> [[GLOBAL_PTR]])
+; CHECK-NEXT: ret void
+;
+ %cast0 = addrspacecast <2 x ptr addrspace(1)> %global.ptr to <2 x ptr>
+ call void (...) @llvm.fake.use(<2 x ptr> %cast0)
+ ret void
+}
+
+define void @use_global_var() {
+; CHECK-LABEL: define void @use_global_var() {
+; CHECK-NEXT: call void (...) @llvm.fake.use(ptr addrspace(3) @gv)
+; CHECK-NEXT: ret void
+;
+ call void (...) @llvm.fake.use(ptr addrspacecast (ptr addrspace(3) @gv to ptr))
+ ret void
+}
+
+define void @use_gep_cast(ptr addrspace(1) %global.ptr) {
+; CHECK-LABEL: define void @use_gep_cast(
+; CHECK-SAME: ptr addrspace(1) [[GLOBAL_PTR:%.*]]) {
+; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, ptr addrspace(1) [[GLOBAL_PTR]], i64 16
+; CHECK-NEXT: call void (...) @llvm.fake.use(ptr addrspace(1) [[GEP]], ptr addrspace(1) [[GLOBAL_PTR]])
+; CHECK-NEXT: ret void
+;
+ %cast0 = addrspacecast ptr addrspace(1) %global.ptr to ptr
+ %gep = getelementptr i8, ptr %cast0, i64 16
+ call void (...) @llvm.fake.use(ptr %gep, ptr %cast0)
+ ret void
+}
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