42 lines
1,021 B
LLVM
42 lines
1,021 B
LLVM
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; RUN: opt -S -aa-pipeline=basic-aa,objc-arc-aa -passes=gvn < %s | FileCheck %s
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@x = common global ptr null, align 8
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declare ptr @llvm.objc.retain(ptr)
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declare i32 @llvm.objc.sync.enter(ptr)
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declare i32 @llvm.objc.sync.exit(ptr)
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; GVN should be able to eliminate this redundant load, with ARC-specific
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; alias analysis.
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; CHECK: define ptr @test0(i32 %n)
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %s = load ptr, ptr @x
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; CHECK-NOT: load
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; CHECK: ret ptr %s
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; CHECK-NEXT: }
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define ptr @test0(i32 %n) nounwind {
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entry:
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%s = load ptr, ptr @x
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%0 = tail call ptr @llvm.objc.retain(ptr %s) nounwind
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%t = load ptr, ptr @x
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ret ptr %t
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}
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; GVN should not be able to eliminate this redundant load, with ARC-specific
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; alias analysis.
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; CHECK-LABEL: define ptr @test1(
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; CHECK: load
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; CHECK: load
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; CHECK: ret ptr %t
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; CHECK: }
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define ptr @test1(i32 %n) nounwind {
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entry:
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%s = load ptr, ptr @x
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%0 = call i32 @llvm.objc.sync.enter(ptr %s)
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%t = load ptr, ptr @x
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%1 = call i32 @llvm.objc.sync.exit(ptr %s)
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ret ptr %t
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}
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