derek.holloway
7502bf64a4
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35 lines
1.2 KiB
LLVM
35 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=licm < %s | FileCheck %s
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%class.LiveThread = type { i64, ptr }
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@globallive = external dso_local global i64, align 8
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; The store should not be sunk (via scalar promotion) past the cmpxchg.
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define void @test(ptr %live_thread) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: [[NEXT_UNPROCESSED_:%.*]] = getelementptr inbounds [[CLASS_LIVETHREAD:%.*]], ptr [[LIVE_THREAD:%.*]], i64 0, i32 1
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: store ptr undef, ptr [[NEXT_UNPROCESSED_]], align 8
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; CHECK-NEXT: [[XCHG:%.*]] = cmpxchg weak ptr @globallive, i64 undef, i64 undef release monotonic, align 8
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; CHECK-NEXT: [[DONE:%.*]] = extractvalue { i64, i1 } [[XCHG]], 1
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; CHECK-NEXT: br i1 [[DONE]], label [[EXIT:%.*]], label [[LOOP]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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%next_unprocessed_ = getelementptr inbounds %class.LiveThread, ptr %live_thread, i64 0, i32 1
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br label %loop
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loop:
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store ptr undef, ptr %next_unprocessed_, align 8
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%xchg = cmpxchg weak ptr @globallive, i64 undef, i64 undef release monotonic, align 8
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%done = extractvalue { i64, i1 } %xchg, 1
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br i1 %done, label %exit, label %loop
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exit:
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ret void
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}
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