The ARC language-specific optimizer. Credit to Dan Gohman.

llvm-svn: 133108

1 files changed, 59 insertions, 0 deletions

diff --git a/llvm/test/Transforms/ObjCARC/contract-storestrong.ll b/llvm/test/Transforms/ObjCARC/contract-storestrong.ll
new file mode 100644
index 00000000000..50ed260eb08
--- /dev/null
+++ b/llvm/test/Transforms/ObjCARC/contract-storestrong.ll
@@ -0,0 +1,59 @@
+; RUN: opt -objc-arc-contract -S < %s | FileCheck %s
+
+target datalayout = "e-p:64:64:64"
+
+declare i8* @objc_retain(i8*)
+declare void @objc_release(i8*)
+
+@x = external global i8*
+
+; CHECK: define void @test0(
+; CHECK: entry:
+; CHECK-NEXT: call void @objc_storeStrong(i8** @x, i8* %p) nounwind
+; CHECK-NEXT: ret void
+define void @test0(i8* %p) {
+entry:
+  %0 = tail call i8* @objc_retain(i8* %p) nounwind
+  %tmp = load i8** @x, align 8
+  store i8* %0, i8** @x, align 8
+  tail call void @objc_release(i8* %tmp) nounwind
+  ret void
+}
+
+; Don't do this if the load is volatile.
+
+;      CHECK: define void @test1(i8* %p) {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   %0 = tail call i8* @objc_retain(i8* %p) nounwind
+; CHECK-NEXT:   %tmp = volatile load i8** @x, align 8
+; CHECK-NEXT:   store i8* %0, i8** @x, align 8
+; CHECK-NEXT:   tail call void @objc_release(i8* %tmp) nounwind
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test1(i8* %p) {
+entry:
+  %0 = tail call i8* @objc_retain(i8* %p) nounwind
+  %tmp = volatile load i8** @x, align 8
+  store i8* %0, i8** @x, align 8
+  tail call void @objc_release(i8* %tmp) nounwind
+  ret void
+}
+
+; Don't do this if the store is volatile.
+
+;      CHECK: define void @test2(i8* %p) {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   %0 = tail call i8* @objc_retain(i8* %p) nounwind
+; CHECK-NEXT:   %tmp = load i8** @x, align 8
+; CHECK-NEXT:   volatile store i8* %0, i8** @x, align 8
+; CHECK-NEXT:   tail call void @objc_release(i8* %tmp) nounwind
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test2(i8* %p) {
+entry:
+  %0 = tail call i8* @objc_retain(i8* %p) nounwind
+  %tmp = load i8** @x, align 8
+  volatile store i8* %0, i8** @x, align 8
+  tail call void @objc_release(i8* %tmp) nounwind
+  ret void
+}