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30 lines
859 B
LLVM
30 lines
859 B
LLVM
; RUN: llc < %s -mtriple=i386-apple-darwin | FileCheck %s
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; rdar://r7512579
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; PHI defs in the atomic loop should be used by the add / adc
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; instructions. They should not be dead.
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define void @t(i64* nocapture %p) nounwind ssp {
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entry:
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; CHECK: t:
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; CHECK: movl $1
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; CHECK: movl (%ebp), %eax
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; CHECK: movl 4(%ebp), %edx
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; CHECK: LBB0_1:
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; CHECK-NOT: movl $1
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; CHECK-NOT: movl $0
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; CHECK: addl
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; CHECK: adcl
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; CHECK: lock
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; CHECK: cmpxchg8b
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; CHECK: jne
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tail call void @llvm.memory.barrier(i1 true, i1 true, i1 true, i1 true, i1 true)
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%0 = tail call i64 @llvm.atomic.load.add.i64.p0i64(i64* %p, i64 1) ; <i64> [#uses=0]
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tail call void @llvm.memory.barrier(i1 true, i1 true, i1 true, i1 true, i1 true)
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ret void
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}
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declare void @llvm.memory.barrier(i1, i1, i1, i1, i1) nounwind
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declare i64 @llvm.atomic.load.add.i64.p0i64(i64* nocapture, i64) nounwind
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