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44 lines
1.2 KiB
LLVM
44 lines
1.2 KiB
LLVM
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; RUN: opt -scoped-noalias -basicaa -gvn -S < %s | FileCheck %s
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define i32 @test1(i32* %p, i32* %q) {
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; CHECK-LABEL: @test1(i32* %p, i32* %q)
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; CHECK: load i32, i32* %p
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; CHECK-NOT: noalias
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; CHECK: %c = add i32 %a, %a
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%a = load i32, i32* %p, !noalias !0
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%b = load i32, i32* %p
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%c = add i32 %a, %b
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ret i32 %c
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}
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define i32 @test2(i32* %p, i32* %q) {
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; CHECK-LABEL: @test2(i32* %p, i32* %q)
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; CHECK: load i32, i32* %p, !alias.scope !0
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; CHECK: %c = add i32 %a, %a
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%a = load i32, i32* %p, !alias.scope !0
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%b = load i32, i32* %p, !alias.scope !0
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%c = add i32 %a, %b
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ret i32 %c
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}
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; FIXME: In this case we can do better than intersecting the scopes, and can
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; concatenate them instead. Both loads are in the same basic block, the first
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; makes the second safe to speculatively execute, and there are no calls that may
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; throw in between.
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define i32 @test3(i32* %p, i32* %q) {
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; CHECK-LABEL: @test3(i32* %p, i32* %q)
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; CHECK: load i32, i32* %p, !alias.scope !1
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; CHECK: %c = add i32 %a, %a
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%a = load i32, i32* %p, !alias.scope !1
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%b = load i32, i32* %p, !alias.scope !2
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%c = add i32 %a, %b
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ret i32 %c
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}
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declare i32 @foo(i32*) readonly
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!0 = !{!0}
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!1 = !{!1}
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!2 = !{!0, !1}
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