222 lines
5.9 KiB
LLVM
222 lines
5.9 KiB
LLVM
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; RUN: opt -aa-pipeline=basic-aa -passes='require<opt-remark-emit>,loop-mssa(licm)' < %s -S | FileCheck %s
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; Check that we can hoist unordered loads
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define i32 @test1(ptr 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, ptr %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-LABEL: 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(ptr 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, ptr %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-LABEL: 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(ptr nocapture noalias %x, ptr 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, ptr %y monotonic, align 4
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%valb = load atomic i32, ptr %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-LABEL: define i32 @test3(
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; CHECK: load atomic i32, ptr %x unordered
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; CHECK-NEXT: br label %loop
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}
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; We can sink an unordered store
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define i32 @test4(ptr nocapture noalias %x, ptr 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, ptr %y monotonic, align 4
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store atomic i32 %vala, ptr %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-LABEL: define i32 @test4(
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; CHECK-LABEL: loop:
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; CHECK: load atomic i32, ptr %y monotonic
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; CHECK-NOT: store
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; CHECK-LABEL: end:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i32 [ %vala
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; CHECK: store atomic i32 %[[LCSSAPHI]], ptr %x unordered, align 4
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}
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; We currently don't handle ordered atomics.
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define i32 @test5(ptr nocapture noalias %x, ptr 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, ptr %y monotonic, align 4
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store atomic i32 %vala, ptr %x release, 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-LABEL: define i32 @test5(
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; CHECK: load atomic i32, ptr %y monotonic
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; CHECK-NEXT: store atomic
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}
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; We currently don't touch volatiles
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define i32 @test6(ptr nocapture noalias %x, ptr 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, ptr %y monotonic, align 4
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store volatile i32 %vala, ptr %x, 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-LABEL: define i32 @test6(
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; CHECK: load atomic i32, ptr %y monotonic
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; CHECK-NEXT: store volatile
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}
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; We currently don't touch volatiles
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define i32 @test6b(ptr nocapture noalias %x, ptr 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, ptr %y monotonic, align 4
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store atomic volatile i32 %vala, ptr %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-LABEL: define i32 @test6b(
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; CHECK: load atomic i32, ptr %y monotonic
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; CHECK-NEXT: store atomic volatile
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}
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; Mixing unorder atomics and normal loads/stores is
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; current unimplemented
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define i32 @test7(ptr nocapture noalias %x, ptr 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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store i32 5, ptr %x
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%vala = load atomic i32, ptr %y monotonic, align 4
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store atomic i32 %vala, ptr %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-LABEL: define i32 @test7(
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; CHECK: store i32 5, ptr %x
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; CHECK-NEXT: load atomic i32, ptr %y
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; CHECK-NEXT: store atomic i32
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}
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; Three provably noalias locations - we can sink normal and unordered, but
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; not monotonic
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define i32 @test7b(ptr nocapture noalias %x, ptr nocapture %y, ptr noalias nocapture %z) nounwind uwtable ssp {
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entry:
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br label %loop
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loop:
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store i32 5, ptr %x
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%vala = load atomic i32, ptr %y monotonic, align 4
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store atomic i32 %vala, ptr %z 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-LABEL: define i32 @test7b(
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; CHECK-LABEL: loop:
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; CHECK: load atomic i32, ptr %y monotonic
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; CHECK-LABEL: end:
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; CHECK: store i32 5, ptr %x
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; CHECK: store atomic i32 %{{.+}}, ptr %z unordered, align 4
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}
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define i32 @test8(ptr nocapture noalias %x, ptr nocapture %y) {
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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, ptr %y monotonic, align 4
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store atomic i32 %vala, ptr %x unordered, align 4
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fence release
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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-LABEL: define i32 @test8(
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; CHECK-LABEL: loop:
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; CHECK: load atomic i32, ptr %y monotonic
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; CHECK-NEXT: store atomic
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; CHECK-NEXT: fence
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}
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; Exact semantics of monotonic accesses are a bit vague in the C++ spec,
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; for the moment, be conservative and don't touch them.
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define i32 @test9(ptr nocapture noalias %x, ptr nocapture %y) {
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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, ptr %y monotonic, align 4
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store atomic i32 %vala, ptr %x monotonic, 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-LABEL: define i32 @test9(
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; CHECK-LABEL: loop:
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; CHECK: load atomic i32, ptr %y monotonic
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; CHECK-NEXT: store atomic i32 %vala, ptr %x monotonic, align 4
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}
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