1 files changed, 44 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/convergent.ll b/llvm/test/Transforms/InstCombine/convergent.ll
new file mode 100644
index 00000000000..1791de70875
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/convergent.ll
@@ -0,0 +1,44 @@
+; RUN: opt -instcombine -S < %s | FileCheck -enable-var-scope %s
+
+declare i32 @k() convergent
+declare i32 @f()
+
+declare i64 @llvm.read_register.i64(metadata) nounwind
+
+define i32 @extern() {
+  ; Convergent attr shouldn't be removed here; k is convergent.
+  ; CHECK: call i32 @k() [[$CONVERGENT_ATTR:#[0-9]+]]
+  %a = call i32 @k() convergent
+  ret i32 %a
+}
+
+define i32 @extern_no_attr() {
+  ; Convergent attr shouldn't be added here, even though k is convergent.
+  ; CHECK: call i32 @k(){{$}}
+  %a = call i32 @k()
+  ret i32 %a
+}
+
+define i32 @no_extern() {
+  ; Convergent should be removed here, as the target is convergent.
+  ; CHECK: call i32 @f(){{$}}
+  %a = call i32 @f() convergent
+  ret i32 %a
+}
+
+define i32 @indirect_call(i32 ()* %f) {
+  ; CHECK: call i32 %f() [[$CONVERGENT_ATTR]]
+  %a = call i32 %f() convergent
+  ret i32 %a
+}
+
+; do not remove from convergent intrinsic call sites
+; CHECK-LABEL: @convergent_intrinsic_call(
+; CHECK: call i64 @llvm.read_register.i64(metadata !0) [[$CONVERGENT_ATTR]]
+define i64 @convergent_intrinsic_call() {
+  %val = call i64 @llvm.read_register.i64(metadata !0) convergent
+  ret i64 %val
+}
+
+; CHECK: [[$CONVERGENT_ATTR]] = { convergent }
+!0 = !{!"foo"}