[SimplifyCFG] Add test for invoke of nounwind non-willreturn function (NFC)

Test both the case with and without willreturn attribute.

Author: nikic

llvm/test/Transforms/SimplifyCFG/invoke.ll

@@ -4,8 +4,9 @@ target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3
 
 declare i32 @__gxx_personality_v0(...)
 declare void @__cxa_call_unexpected(i8*)
-declare void @purefn() nounwind readnone
-declare i32 @read_only() nounwind readonly
+declare void @purefn() nounwind readnone willreturn
+declare i32 @readonly() nounwind readonly
+declare i32 @readonly_willreturn() nounwind readonly willreturn
 declare i32 @nounwind_fn() nounwind
 declare i32 @fn()
 
@@ -61,7 +62,7 @@ define i8* @f2_no_null_opt() nounwind uwtable ssp #0 personality i8* bitcast (i3
 ; CHECK-NEXT:    [[TMP0:%.*]] = landingpad { i8*, i32 }
 ; CHECK-NEXT:    filter [0 x i8*] zeroinitializer
 ; CHECK-NEXT:    [[TMP1:%.*]] = extractvalue { i8*, i32 } [[TMP0]], 0
-; CHECK-NEXT:    tail call void @__cxa_call_unexpected(i8* [[TMP1]]) #[[ATTR6:[0-9]+]]
+; CHECK-NEXT:    tail call void @__cxa_call_unexpected(i8* [[TMP1]]) #[[ATTR7:[0-9]+]]
 ; CHECK-NEXT:    unreachable
 ;
 entry:
@@ -79,13 +80,13 @@ lpad:
   unreachable
 }
 
-define i32 @f3() nounwind uwtable ssp personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
-; CHECK-LABEL: @f3(
+define i32 @invoke_readonly_may_not_return() nounwind personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+; CHECK-LABEL: @invoke_readonly_may_not_return(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    ret i32 3
 ;
 entry:
-  %call = invoke i32 @read_only()
+  %call = invoke i32 @readonly()
   to label %invoke.cont unwind label %lpad
 
 invoke.cont:
@@ -99,14 +100,34 @@ lpad:
   unreachable
 }
 
-define i32 @f4() nounwind uwtable ssp personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
-; CHECK-LABEL: @f4(
+define i32 @invoke_readonly_willreturn() nounwind personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+; CHECK-LABEL: @invoke_readonly_willreturn(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[CALL:%.*]] = call i32 @read_only()
+; CHECK-NEXT:    ret i32 3
+;
+entry:
+  %call = invoke i32 @readonly_willreturn()
+  to label %invoke.cont unwind label %lpad
+
+invoke.cont:
+  ret i32 3
+
+lpad:
+  %0 = landingpad { i8*, i32 }
+  filter [0 x i8*] zeroinitializer
+  %1 = extractvalue { i8*, i32 } %0, 0
+  tail call void @__cxa_call_unexpected(i8* %1) noreturn nounwind
+  unreachable
+}
+
+define i32 @invoke_readonly_willreturn_with_used_retval() nounwind personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+; CHECK-LABEL: @invoke_readonly_willreturn_with_used_retval(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @readonly_willreturn()
 ; CHECK-NEXT:    ret i32 [[CALL]]
 ;
 entry:
-  %call = invoke i32 @read_only()
+  %call = invoke i32 @readonly_willreturn()
   to label %invoke.cont unwind label %lpad
 
 invoke.cont:
@@ -136,7 +157,7 @@ define i32 @f5(i1 %cond, i8* %a, i8* %b) personality i8* bitcast (i32 (...)* @__
 ; CHECK:       lpad:
 ; CHECK-NEXT:    [[TMP0:%.*]] = landingpad { i8*, i32 }
 ; CHECK-NEXT:    filter [0 x i8*] zeroinitializer
-; CHECK-NEXT:    tail call void @__cxa_call_unexpected(i8* [[A:%.*]]) #[[ATTR6]]
+; CHECK-NEXT:    tail call void @__cxa_call_unexpected(i8* [[A:%.*]]) #[[ATTR7]]
 ; CHECK-NEXT:    unreachable
 ;
 entry: