Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/Transforms/Inline/dynamic_alloca_test.ll

@@ -0,0 +1,45 @@
+; Test that functions with dynamic allocas get inlined in a case where
+; naively inlining it would result in a miscompilation.
+; Functions with dynamic allocas can only be inlined into functions that
+; already have dynamic allocas.
+
+; RUN: opt < %s -inline -S | FileCheck %s
+;
+; FIXME: This test is xfailed because the inline cost rewrite disabled *all*
+; inlining of functions which contain a dynamic alloca. It should be re-enabled
+; once that functionality is restored.
+; XFAIL: *
+
+declare void @ext(i32*)
+
+define internal void @callee(i32 %N) {
+  %P = alloca i32, i32 %N
+  call void @ext(i32* %P)
+  ret void
+}
+
+define void @foo(i32 %N) {
+; CHECK-LABEL: @foo(
+; CHECK: alloca i32, i32 %{{.*}}
+; CHECK: call i8* @llvm.stacksave()
+; CHECK: alloca i32, i32 %{{.*}}
+; CHECK: call void @ext
+; CHECK: call void @llvm.stackrestore
+; CHECK: ret
+
+entry:
+  %P = alloca i32, i32 %N
+  call void @ext(i32* %P)
+  br label %loop
+
+loop:
+  %count = phi i32 [ 0, %entry ], [ %next, %loop ]
+  %next = add i32 %count, 1
+  call void @callee(i32 %N)
+  %cond = icmp eq i32 %count, 100000
+  br i1 %cond, label %out, label %loop
+
+out:
+  ret void
+}
+