forked from OSchip/llvm-project
80 lines
2.1 KiB
LLVM
80 lines
2.1 KiB
LLVM
; RUN: opt < %s -S -basicaa -licm | FileCheck %s
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; Check that we can hoist unordered loads
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define i32 @test1(i32* nocapture %y) nounwind uwtable ssp {
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entry:
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br label %loop
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loop:
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%i = phi i32 [ %inc, %loop ], [ 0, %entry ]
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%val = load atomic i32* %y unordered, align 4
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%inc = add nsw i32 %i, 1
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%exitcond = icmp eq i32 %inc, %val
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br i1 %exitcond, label %end, label %loop
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end:
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ret i32 %val
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; CHECK: define i32 @test1(
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; CHECK: load atomic
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; CHECK-NEXT: br label %loop
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}
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; Check that we don't sink/hoist monotonic loads
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; (Strictly speaking, it's not forbidden, but it's supposed to be possible to
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; use monotonic for spinlock-like constructs.)
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define i32 @test2(i32* nocapture %y) nounwind uwtable ssp {
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entry:
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br label %loop
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loop:
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%val = load atomic i32* %y monotonic, align 4
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%exitcond = icmp ne i32 %val, 0
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br i1 %exitcond, label %end, label %loop
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end:
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ret i32 %val
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; CHECK: define i32 @test2(
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; CHECK: load atomic
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; CHECK-NEXT: %exitcond = icmp ne
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; CHECK-NEXT: br i1 %exitcond, label %end, label %loop
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}
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; Check that we hoist unordered around monotonic.
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; (The noalias shouldn't be necessary in theory, but LICM isn't quite that
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; smart yet.)
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define i32 @test3(i32* nocapture noalias %x, i32* nocapture %y) nounwind uwtable ssp {
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entry:
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br label %loop
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loop:
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%vala = load atomic i32* %y monotonic, align 4
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%valb = load atomic i32* %x unordered, align 4
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%exitcond = icmp ne i32 %vala, %valb
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br i1 %exitcond, label %end, label %loop
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end:
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ret i32 %vala
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; CHECK: define i32 @test3(
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; CHECK: load atomic i32* %x unordered
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; CHECK-NEXT: br label %loop
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}
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; Don't try to "sink" unordered stores yet; it is legal, but the machinery
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; isn't there.
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define i32 @test4(i32* nocapture noalias %x, i32* nocapture %y) nounwind uwtable ssp {
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entry:
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br label %loop
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loop:
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%vala = load atomic i32* %y monotonic, align 4
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store atomic i32 %vala, i32* %x unordered, align 4
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%exitcond = icmp ne i32 %vala, 0
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br i1 %exitcond, label %end, label %loop
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end:
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ret i32 %vala
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; CHECK: define i32 @test4(
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; CHECK: load atomic i32* %y monotonic
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; CHECK-NEXT: store atomic
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}
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