Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/Analysis/GlobalsModRef/weak-interposition.ll

@@ -0,0 +1,24 @@
+; RUN: opt -S -O1 < %s | FileCheck %s
+
+@a = common global i32 0, align 4
+
+; @hook_me is weak, so GMR must not eliminate the reload of @a in @f,
+; even though @hook_me doesn't mod or ref @a.
+
+; Function Attrs: nounwind ssp uwtable
+define weak i32 @hook_me() {
+  ret i32 0
+}
+
+; Function Attrs: nounwind ssp uwtable
+define i32 @f() {
+  %1 = alloca i32, align 4
+  store i32 4, i32* @a, align 4
+  %2 = call i32 @hook_me()
+  ; CHECK: load i32, i32* @a, align 4
+  %3 = load i32, i32* @a, align 4
+  %4 = add nsw i32 %3, %2
+  store i32 %4, i32* @a, align 4
+  %5 = load i32, i32* %1
+  ret i32 %5
+}