[SimplifyCFG] Add test for hoisting loads with tbaa metadata.

Author: fhahn

llvm/test/Transforms/SimplifyCFG/hoisting-metadata.ll

@@ -0,0 +1,137 @@
+; RUN: opt -p simplifycfg -S %s | FileCheck %s
+
+declare void @init(ptr)
+
+define i64 @hoist_load_with_matching_pointers_and_tbaa(i1 %c) {
+; CHECK-LABEL: define i64 @hoist_load_with_matching_pointers_and_tbaa(
+; CHECK-SAME: i1 [[C:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[TMP:%.*]] = alloca i64, align 8
+; CHECK-NEXT:    call void @init(ptr [[TMP]])
+; CHECK-NEXT:    [[TMP0:%.*]] = load i64, ptr [[TMP]], align 8
+; CHECK-NOT:       !tbaa
+; CHECK-NEXT:    [[TMP1:%.*]] = load i64, ptr [[TMP]], align 8
+; CHECK-NOT:       !tbaa
+; CHECK-NEXT:    [[P:%.*]] = select i1 [[C]], i64 [[TMP0]], i64 [[TMP1]]
+; CHECK-NEXT:    ret i64 [[P]]
+;
+entry:
+  %tmp = alloca i64, align 8
+  call void @init(ptr %tmp)
+  br i1 %c, label %then, label %else
+
+then:
+  %0 = load i64, ptr %tmp, align 8, !tbaa !0
+  br label %exit
+
+else:
+  %1 = load i64, ptr %tmp, align 8, !tbaa !0
+  br label %exit
+
+exit:
+  %p = phi i64 [ %0, %then ], [ %1, %else ]
+  ret i64 %p
+}
+
+define i64 @hoist_load_with_matching_tbaa_different_pointers(i1 %c) {
+; CHECK-LABEL: define i64 @hoist_load_with_matching_tbaa_different_pointers(
+; CHECK-SAME: i1 [[C:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[TMP:%.*]] = alloca i64, align 8
+; CHECK-NEXT:    [[TMP_1:%.*]] = alloca i64, align 8
+; CHECK-NEXT:    call void @init(ptr [[TMP]])
+; CHECK-NEXT:    call void @init(ptr [[TMP_1]])
+; CHECK-NEXT:    [[TMP0:%.*]] = load i64, ptr [[TMP]], align 8
+; CHECK-NOT:       !tbaa
+; CHECK-NEXT:    [[TMP1:%.*]] = load i64, ptr [[TMP_1]], align 8
+; CHECK-NOT:       !tbaa
+; CHECK-NEXT:    [[P:%.*]] = select i1 [[C]], i64 [[TMP0]], i64 [[TMP1]]
+; CHECK-NEXT:    ret i64 [[P]]
+;
+entry:
+  %tmp = alloca i64, align 8
+  %tmp.1 = alloca i64, align 8
+  call void @init(ptr %tmp)
+  call void @init(ptr %tmp.1)
+  br i1 %c, label %then, label %else
+
+then:
+  %0 = load i64, ptr %tmp, align 8, !tbaa !0
+  br label %exit
+
+else:
+  %1 = load i64, ptr %tmp.1, align 8, !tbaa !0
+  br label %exit
+
+exit:
+  %p = phi i64 [ %0, %then ], [ %1, %else ]
+  ret i64 %p
+}
+
+define i64 @hoist_load_with_different_tbaa(i1 %c) {
+; CHECK-LABEL: define i64 @hoist_load_with_different_tbaa(
+; CHECK-SAME: i1 [[C:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[TMP:%.*]] = alloca i64, align 8
+; CHECK-NEXT:    call void @init(ptr [[TMP]])
+; CHECK-NEXT:    [[TMP0:%.*]] = load i64, ptr [[TMP]], align 8
+; CHECK-NOT:       !tbaa
+; CHECK-NEXT:    [[TMP1:%.*]] = load i64, ptr [[TMP]], align 8
+; CHECK-NOT:       !tbaa
+; CHECK-NEXT:    [[P:%.*]] = select i1 [[C]], i64 [[TMP0]], i64 [[TMP1]]
+; CHECK-NEXT:    ret i64 [[P]]
+;
+entry:
+  %tmp = alloca i64, align 8
+  call void @init(ptr %tmp)
+  br i1 %c, label %then, label %else
+
+then:
+  %0 = load i64, ptr %tmp, align 8, !tbaa !0
+  br label %exit
+
+else:
+  %1 = load i64, ptr %tmp, align 8, !tbaa !5
+  br label %exit
+
+exit:
+  %p = phi i64 [ %0, %then ], [ %1, %else ]
+  ret i64 %p
+}
+
+define i64 @hoist_different_ops(i1 %c, i64 %a) {
+; CHECK-LABEL: define i64 @hoist_different_ops(
+; CHECK-SAME: i1 [[C:%.*]], i64 [[A:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[TMP:%.*]] = alloca i64, align 8
+; CHECK-NEXT:    call void @init(ptr [[TMP]])
+; CHECK-NEXT:    [[TMP0:%.*]] = load i64, ptr [[TMP]], align 8
+; CHECK-NOT:       !tbaa
+; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[A]], 123
+; CHECK-NEXT:    [[P:%.*]] = select i1 [[C]], i64 [[TMP0]], i64 [[TMP1]]
+; CHECK-NEXT:    ret i64 [[P]]
+;
+entry:
+  %tmp = alloca i64, align 8
+  call void @init(ptr %tmp)
+  br i1 %c, label %then, label %else
+
+then:
+  %0 = load i64, ptr %tmp, align 8, !tbaa !0
+  br label %exit
+
+else:
+  %1 = add i64 %a, 123
+  br label %exit
+
+exit:
+  %p = phi i64 [ %0, %then ], [ %1, %else ]
+  ret i64 %p
+}
+
+!0 = !{!1, !1, i64 0}
+!1 = !{!"p2 long long", !2, i64 0}
+!2 = !{!"any pointer", !3, i64 0}
+!3 = !{!"omnipotent char", !4, i64 0}
+!4 = !{!"Simple C++ TBAA"}
+!5 = !{!3, !3, i64 0}