[SimplifyCFG] Add test for updating llvm.access.group when hoisting.

Add extra test coverage for preserving llvm.access.group metadata when
hoisting.

Author: fhahn

llvm/test/Transforms/SimplifyCFG/preserve-load-metadata.ll

@@ -1,15 +1,24 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
 ; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -hoist-common-insts=true -S | FileCheck %s
 
 declare void @bar(ptr)
 declare void @baz(ptr)
 
-; CHECK-LABEL: @test_load_combine_metadata(
 ; Check that align metadata is combined
-; CHECK: load ptr, ptr %p
-; CHECK-SAME: !align ![[ALIGN:[0-9]+]]
-; CHECK: t:
-; CHECK: f:
 define void @test_load_combine_metadata(i1 %c, ptr %p) {
+; CHECK-LABEL: define void @test_load_combine_metadata(
+; CHECK-SAME: i1 [[C:%.*]], ptr [[P:%.*]]) {
+; CHECK-NEXT:    [[V1:%.*]] = load ptr, ptr [[P]], align 8, !align [[META0:![0-9]+]]
+; CHECK-NEXT:    br i1 [[C]], label %[[T:.*]], label %[[F:.*]]
+; CHECK:       [[T]]:
+; CHECK-NEXT:    call void @bar(ptr [[V1]])
+; CHECK-NEXT:    br label %[[CONT:.*]]
+; CHECK:       [[F]]:
+; CHECK-NEXT:    call void @baz(ptr [[V1]])
+; CHECK-NEXT:    br label %[[CONT]]
+; CHECK:       [[CONT]]:
+; CHECK-NEXT:    ret void
+;
   br i1 %c, label %t, label %f
 
 t:
@@ -26,7 +35,37 @@ cont:
   ret void
 }
 
-; CHECK: ![[ALIGN]] = !{i64 8}
+define i64 @test_intersect_access_grou_metadata(i1 %c, ptr %p) {
+; CHECK-LABEL: define i64 @test_intersect_access_grou_metadata(
+; CHECK-SAME: i1 [[C:%.*]], ptr [[P:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[L_1:%.*]] = load i64, ptr [[P]], align 8, !llvm.access.group [[ACC_GRP1:![0-9]+]]
+; CHECK-NEXT:    ret i64 [[L_1]]
+;
+entry:
+  br i1 %c, label %then, label %else
+
+then:
+  %l.1 = load i64, ptr %p, align 8, !llvm.access.group !2
+  br label %exit
+
+else:
+  %l.2 = load i64, ptr %p, align 8, !llvm.access.group !5
+  br label %exit
+
+exit:
+  %res = phi i64 [ %l.1, %then ], [ %l.2, %else ]
+  ret i64 %res
+}
 
 !0 = !{i64 8}
 !1 = !{i64 16}
+!2 = !{!3, !4}
+!3 = distinct !{}
+!4 = distinct !{}
+!5 = !{!3, !6}
+!6 = distinct !{}
+;.
+; CHECK: [[META0]] = !{i64 8}
+; CHECK: [[ACC_GRP1]] = distinct !{}
+;.