23 lines
573 B
LLVM
23 lines
573 B
LLVM
; RUN: llc < %s -mtriple=i386-apple-darwin -mcpu=corei7 | 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-LABEL: t:
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; CHECK: movl ([[REG:%[a-z]+]]), %eax
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; CHECK: movl 4([[REG]]), %edx
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; CHECK: LBB0_1:
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; CHECK: movl %eax, %ebx
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; CHECK: addl $1, %ebx
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; CHECK: movl %edx, %ecx
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; CHECK: adcl $0, %ecx
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; CHECK: lock
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; CHECK-NEXT: cmpxchg8b ([[REG]])
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; CHECK-NEXT: jne
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%0 = atomicrmw add i64* %p, i64 1 seq_cst
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ret void
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}
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