[GVN] Add tests for captured-before analysis (NFC)

Author: nikic

llvm/test/Transforms/GVN/captured-before.ll

@@ -0,0 +1,80 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
+; RUN: opt -S -passes=gvn < %s | FileCheck %s
+
+declare void @capture(ptr)
+declare void @some_call()
+
+define i32 @test_call_before_capture(ptr %p) {
+; CHECK-LABEL: define i32 @test_call_before_capture(
+; CHECK-SAME: ptr [[P:%.*]]) {
+; CHECK-NEXT:    [[A:%.*]] = alloca i32, align 4
+; CHECK-NEXT:    store i32 123, ptr [[A]], align 4
+; CHECK-NEXT:    call void @some_call()
+; CHECK-NEXT:    call void @capture(ptr [[A]])
+; CHECK-NEXT:    ret i32 123
+;
+  %a = alloca i32
+  store i32 123, ptr %a
+  call void @some_call()
+  %v = load i32, ptr %a
+  call void @capture(ptr %a)
+  ret i32 %v
+}
+
+define i32 @test_call_after_capture(ptr %p) {
+; CHECK-LABEL: define i32 @test_call_after_capture(
+; CHECK-SAME: ptr [[P:%.*]]) {
+; CHECK-NEXT:    [[A:%.*]] = alloca i32, align 4
+; CHECK-NEXT:    store i32 123, ptr [[A]], align 4
+; CHECK-NEXT:    call void @capture(ptr [[A]])
+; CHECK-NEXT:    call void @some_call()
+; CHECK-NEXT:    [[V:%.*]] = load i32, ptr [[A]], align 4
+; CHECK-NEXT:    ret i32 [[V]]
+;
+  %a = alloca i32
+  store i32 123, ptr %a
+  call void @capture(ptr %a)
+  call void @some_call()
+  %v = load i32, ptr %a
+  ret i32 %v
+}
+
+define i32 @test_store_before_capture(ptr %p) {
+; CHECK-LABEL: define i32 @test_store_before_capture(
+; CHECK-SAME: ptr [[P:%.*]]) {
+; CHECK-NEXT:    [[A:%.*]] = alloca i32, align 4
+; CHECK-NEXT:    store i32 123, ptr [[A]], align 4
+; CHECK-NEXT:    [[P2:%.*]] = load ptr, ptr [[P]], align 8
+; CHECK-NEXT:    store i32 42, ptr [[P2]], align 4
+; CHECK-NEXT:    [[V:%.*]] = load i32, ptr [[A]], align 4
+; CHECK-NEXT:    call void @capture(ptr [[A]])
+; CHECK-NEXT:    ret i32 [[V]]
+;
+  %a = alloca i32
+  store i32 123, ptr %a
+  %p2 = load ptr, ptr %p
+  store i32 42, ptr %p2
+  %v = load i32, ptr %a
+  call void @capture(ptr %a)
+  ret i32 %v
+}
+
+define i32 @test_store_after_capture(ptr %p) {
+; CHECK-LABEL: define i32 @test_store_after_capture(
+; CHECK-SAME: ptr [[P:%.*]]) {
+; CHECK-NEXT:    [[A:%.*]] = alloca i32, align 4
+; CHECK-NEXT:    store i32 123, ptr [[A]], align 4
+; CHECK-NEXT:    call void @capture(ptr [[A]])
+; CHECK-NEXT:    [[P2:%.*]] = load ptr, ptr [[P]], align 8
+; CHECK-NEXT:    store i32 42, ptr [[P2]], align 4
+; CHECK-NEXT:    [[V:%.*]] = load i32, ptr [[A]], align 4
+; CHECK-NEXT:    ret i32 [[V]]
+;
+  %a = alloca i32
+  store i32 123, ptr %a
+  call void @capture(ptr %a)
+  %p2 = load ptr, ptr %p
+  store i32 42, ptr %p2
+  %v = load i32, ptr %a
+  ret i32 %v
+}