e94a518a22
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
24 lines
504 B
LLVM
24 lines
504 B
LLVM
; RUN: opt < %s -loweratomic -S | FileCheck %s
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define i8 @cmpswap() {
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; CHECK-LABEL: @cmpswap(
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%i = alloca i8
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%j = cmpxchg i8* %i, i8 0, i8 42 monotonic monotonic
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; CHECK: [[INST:%[a-z0-9]+]] = load
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; CHECK-NEXT: icmp
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; CHECK-NEXT: select
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; CHECK-NEXT: store
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ret i8 %j
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; CHECK: ret i8 [[INST]]
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}
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define i8 @swap() {
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; CHECK-LABEL: @swap(
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%i = alloca i8
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%j = atomicrmw xchg i8* %i, i8 42 monotonic
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; CHECK: [[INST:%[a-z0-9]+]] = load
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; CHECK-NEXT: store
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ret i8 %j
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; CHECK: ret i8 [[INST]]
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}
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