[llvm] [Inliner] Prevent adding pointer attributes to non-pointer arguments (PR #115569)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Harald van Dijk (hvdijk)

<details>
<summary>Changes</summary>

Fixes a crash seen after #<!-- -->114311

---
Full diff: https://github.com/llvm/llvm-project/pull/115569.diff


2 Files Affected:

- (modified) llvm/lib/Transforms/Utils/InlineFunction.cpp (+9) 
- (modified) llvm/test/Transforms/Inline/arg-attr-propagation.ll (+26) 


``````````diff
diff --git a/llvm/lib/Transforms/Utils/InlineFunction.cpp b/llvm/lib/Transforms/Utils/InlineFunction.cpp
index a27cb4dd219c30..cbad66ed9dfe5e 100644
--- a/llvm/lib/Transforms/Utils/InlineFunction.cpp
+++ b/llvm/lib/Transforms/Utils/InlineFunction.cpp
@@ -1477,6 +1477,15 @@ static void AddParamAndFnBasicAttributes(const CallBase &CB,
 
         // If so, propagate its access attributes.
         AL = AL.addParamAttributes(Context, I, ValidObjParamAttrs[ArgNo]);
+
+        // If the argument is not a pointer type, remove attributes which only
+        // apply to pointer types.
+        if (!NewInnerCB->getArgOperand(I)->getType()->isPointerTy()) {
+          AL = AL.removeParamAttribute(Context, I, Attribute::ReadNone);
+          AL = AL.removeParamAttribute(Context, I, Attribute::ReadOnly);
+          continue;
+        }
+
         // We can have conflicting attributes from the inner callsite and
         // to-be-inlined callsite. In that case, choose the most
         // restrictive.
diff --git a/llvm/test/Transforms/Inline/arg-attr-propagation.ll b/llvm/test/Transforms/Inline/arg-attr-propagation.ll
index 7b096539e7e1b1..fad6c7ced2edd2 100644
--- a/llvm/test/Transforms/Inline/arg-attr-propagation.ll
+++ b/llvm/test/Transforms/Inline/arg-attr-propagation.ll
@@ -76,3 +76,29 @@ define i32 @caller3(ptr dereferenceable(33) %t1) {
   ret i32 %t2
 }
 
+; Make sure that we don't propagate a pointer-only attribute to a vector of pointers.
+
+declare void @helper4(<4 x ptr> %ptr)
+
+define void @callee4(ptr readonly %ptr, <4 x i64> %idx) {
+; CHECK-LABEL: define {{[^@]+}}@callee4
+; CHECK-SAME: (ptr readonly [[PTR:%.*]], <4 x i64> [[IDX:%.*]]) {
+; CHECK-NEXT:    [[PTRS:%.*]] = getelementptr inbounds i8, ptr [[PTR]], <4 x i64> [[IDX]]
+; CHECK-NEXT:    call void @helper4(<4 x ptr> [[PTRS]])
+; CHECK-NEXT:    ret void
+;
+  %ptrs = getelementptr inbounds i8, ptr %ptr, <4 x i64> %idx
+  call void @helper4(<4 x ptr> %ptrs)
+  ret void
+}
+
+define void @caller4(ptr readonly %ptr, <4 x i64> %idx) {
+; CHECK-LABEL: define {{[^@]+}}@caller4
+; CHECK-SAME: (ptr readonly [[PTR:%.*]], <4 x i64> [[IDX:%.*]]) {
+; CHECK-NEXT:    [[PTRS_I:%.*]] = getelementptr inbounds i8, ptr [[PTR]], <4 x i64> [[IDX]]
+; CHECK-NEXT:    call void @helper4(<4 x ptr> [[PTRS_I]])
+; CHECK-NEXT:    ret void
+;
+  call void @callee4(ptr readonly %ptr, <4 x i64> %idx)
+  ret void
+}

``````````

</details>


https://github.com/llvm/llvm-project/pull/115569