Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/Transforms/ArgumentPromotion/musttail.ll

@@ -0,0 +1,45 @@
+; RUN: opt < %s -argpromotion -S | FileCheck %s
+; PR36543
+
+; Don't promote arguments of musttail callee
+
+%T = type { i32, i32, i32, i32 }
+
+; CHECK-LABEL: define internal i32 @test(%T* %p)
+define internal i32 @test(%T* %p) {
+  %a.gep = getelementptr %T, %T* %p, i64 0, i32 3
+  %b.gep = getelementptr %T, %T* %p, i64 0, i32 2
+  %a = load i32, i32* %a.gep
+  %b = load i32, i32* %b.gep
+  %v = add i32 %a, %b
+  ret i32 %v
+}
+
+; CHECK-LABEL: define i32 @caller(%T* %p)
+define i32 @caller(%T* %p) {
+  %v = musttail call i32 @test(%T* %p)
+  ret i32 %v
+}
+
+; Don't promote arguments of musttail caller
+
+define i32 @foo(%T* %p, i32 %v) {
+  ret i32 0
+}
+
+; CHECK-LABEL: define internal i32 @test2(%T* %p, i32 %p2)
+define internal i32 @test2(%T* %p, i32 %p2) {
+  %a.gep = getelementptr %T, %T* %p, i64 0, i32 3
+  %b.gep = getelementptr %T, %T* %p, i64 0, i32 2
+  %a = load i32, i32* %a.gep
+  %b = load i32, i32* %b.gep
+  %v = add i32 %a, %b
+  %ca = musttail call i32 @foo(%T* undef, i32 %v)
+  ret i32 %ca
+}
+
+; CHECK-LABEL: define i32 @caller2(%T* %g)
+define i32 @caller2(%T* %g) {
+  %v = call i32 @test2(%T* %g, i32 0)
+  ret i32 %v
+}