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43 lines
1.1 KiB
LLVM
43 lines
1.1 KiB
LLVM
; RUN: opt -S -basic-aa -objc-arc-aa -gvn < %s | FileCheck %s
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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 i8* null, align 8
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declare i8* @llvm.objc.retain(i8*)
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declare i32 @llvm.objc.sync.enter(i8*)
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declare i32 @llvm.objc.sync.exit(i8*)
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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 i8* @test0(i32 %n)
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %s = load i8*, i8** @x
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; CHECK-NOT: load
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; CHECK: ret i8* %s
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; CHECK-NEXT: }
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define i8* @test0(i32 %n) nounwind {
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entry:
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%s = load i8*, i8** @x
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%0 = tail call i8* @llvm.objc.retain(i8* %s) nounwind
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%t = load i8*, i8** @x
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ret i8* %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 i8* @test1(
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; CHECK: load
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; CHECK: load
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; CHECK: ret i8* %t
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; CHECK: }
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define i8* @test1(i32 %n) nounwind {
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entry:
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%s = load i8*, i8** @x
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%0 = call i32 @llvm.objc.sync.enter(i8* %s)
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%t = load i8*, i8** @x
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%1 = call i32 @llvm.objc.sync.exit(i8* %s)
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ret i8* %t
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}
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