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68c567a38a
The syntax for "cmpxchg" should now look something like: cmpxchg i32* %addr, i32 42, i32 3 acquire monotonic where the second ordering argument gives the required semantics in the case that no exchange takes place. It should be no stronger than the first ordering constraint and cannot be either "release" or "acq_rel" (since no store will have taken place). rdar://problem/15996804 llvm-svn: 203559
88 lines
1.6 KiB
LLVM
88 lines
1.6 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; PR2967
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target datalayout =
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"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32"
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target triple = "i386-pc-linux-gnu"
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define void @test1(i32 %x) nounwind {
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entry:
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%0 = icmp eq i32 %x, 0 ; <i1> [#uses=1]
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br i1 %0, label %bb, label %return
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bb: ; preds = %entry
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%1 = load volatile i32* null
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unreachable
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br label %return
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return: ; preds = %entry
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ret void
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; CHECK-LABEL: @test1(
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; CHECK: load volatile
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}
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; rdar://7958343
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define void @test2() nounwind {
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entry:
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store i32 4,i32* null
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ret void
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; CHECK-LABEL: @test2(
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; CHECK: call void @llvm.trap
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; CHECK: unreachable
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}
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; PR7369
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define void @test3() nounwind {
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entry:
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store volatile i32 4, i32* null
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ret void
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; CHECK-LABEL: @test3(
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; CHECK: store volatile i32 4, i32* null
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; CHECK: ret
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}
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; Check store before unreachable.
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define void @test4(i1 %C, i32* %P) {
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; CHECK-LABEL: @test4(
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; CHECK: entry:
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; CHECK-NEXT: br i1 %C
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entry:
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br i1 %C, label %T, label %F
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T:
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store volatile i32 0, i32* %P
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unreachable
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F:
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ret void
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}
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; Check cmpxchg before unreachable.
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define void @test5(i1 %C, i32* %P) {
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; CHECK-LABEL: @test5(
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; CHECK: entry:
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; CHECK-NEXT: br i1 %C
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entry:
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br i1 %C, label %T, label %F
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T:
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cmpxchg volatile i32* %P, i32 0, i32 1 seq_cst seq_cst
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unreachable
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F:
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ret void
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}
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; Check atomicrmw before unreachable.
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define void @test6(i1 %C, i32* %P) {
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; CHECK-LABEL: @test6(
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; CHECK: entry:
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; CHECK-NEXT: br i1 %C
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entry:
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br i1 %C, label %T, label %F
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T:
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atomicrmw volatile xchg i32* %P, i32 0 seq_cst
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unreachable
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F:
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ret void
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}
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