45 lines
1.0 KiB
LLVM
45 lines
1.0 KiB
LLVM
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; RUN: opt -instcombine -S < %s | FileCheck %s
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target datalayout = "e-m:e-p:64:64:64-i64:64-f80:128-n8:16:32:64-S128"
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; Check that nonnull metadata is propagated from dominating load.
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; CHECK-LABEL: @combine_metadata_dominance1(
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; CHECK-LABEL: bb1:
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; CHECK: load i32*, i32** %p, align 8, !nonnull !0
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; CHECK-NOT: load i32*, i32** %p
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define void @combine_metadata_dominance1(i32** %p) {
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entry:
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%a = load i32*, i32** %p, !nonnull !0
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br label %bb1
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bb1:
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%b = load i32*, i32** %p
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store i32 0, i32* %a
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store i32 0, i32* %b
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ret void
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}
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declare i32 @use(i32*, i32) readonly
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; Check that nonnull from the dominated load does not get propagated.
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; There are some cases where it would be safe to keep it.
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; CHECK-LABEL: @combine_metadata_dominance2(
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; CHECK-NOT: nonnull
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define void @combine_metadata_dominance2(i32** %p) {
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entry:
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%a = load i32*, i32** %p
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br i1 undef, label %bb1, label %bb2
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bb1:
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%b = load i32*, i32** %p, !nonnull !0
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store i32 0, i32* %a
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store i32 0, i32* %b
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ret void
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bb2:
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ret void
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}
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!0 = !{}
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