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; RUN: opt -S -aa-pipeline=basic-aa,objc-arc-aa -passes=gvn < %s | FileCheck %s
@x = common global ptr null, align 8
declare ptr @llvm.objc.retain(ptr)
declare i32 @llvm.objc.sync.enter(ptr)
declare i32 @llvm.objc.sync.exit(ptr)
; GVN should be able to eliminate this redundant load, with ARC-specific
; alias analysis.
; CHECK: define ptr @test0(i32 %n)
; CHECK-NEXT: entry:
; CHECK-NEXT: %s = load ptr, ptr @x
; CHECK-NOT: load
; CHECK: ret ptr %s
; CHECK-NEXT: }
define ptr @test0(i32 %n) nounwind {
entry:
%s = load ptr, ptr @x
%0 = tail call ptr @llvm.objc.retain(ptr %s) nounwind
%t = load ptr, ptr @x
ret ptr %t
}
; GVN should not be able to eliminate this redundant load, with ARC-specific
; alias analysis.
; CHECK-LABEL: define ptr @test1(
; CHECK: load
; CHECK: load
; CHECK: ret ptr %t
; CHECK: }
define ptr @test1(i32 %n) nounwind {
entry:
%s = load ptr, ptr @x
%0 = call i32 @llvm.objc.sync.enter(ptr %s)
%t = load ptr, ptr @x
%1 = call i32 @llvm.objc.sync.exit(ptr %s)
ret ptr %t
}
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