derek.holloway
7502bf64a4
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32 lines
1.0 KiB
LLVM
32 lines
1.0 KiB
LLVM
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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%struct.C = type { ptr, i32 }
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; Check that we instcombine the load across the prefetch.
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; CHECK-LABEL: define signext i32 @foo
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define signext i32 @foo(ptr %c) local_unnamed_addr #0 {
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; CHECK: store i32 %dec, ptr %length_
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; CHECK-NOT: load
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; CHECK: llvm.prefetch
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; CHECK-NEXT: ret
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entry:
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%0 = load ptr, ptr %c, align 8
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%1 = load ptr, ptr %0, align 8
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store ptr %1, ptr %c, align 8
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%length_ = getelementptr inbounds %struct.C, ptr %c, i32 0, i32 1
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%2 = load i32, ptr %length_, align 8
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%dec = add nsw i32 %2, -1
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store i32 %dec, ptr %length_, align 8
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call void @llvm.prefetch(ptr %1, i32 0, i32 0, i32 1)
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%3 = load i32, ptr %length_, align 8
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ret i32 %3
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}
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; Function Attrs: inaccessiblemem_or_argmemonly nounwind
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declare void @llvm.prefetch(ptr nocapture readonly, i32, i32, i32)
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attributes #0 = { noinline nounwind }
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; We've explicitly removed the function attrs from llvm.prefetch so we get the defaults.
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; attributes #1 = { inaccessiblemem_or_argmemonly nounwind }
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