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annotate test/CodeGen/X86/2010-10-08-cmpxchg8b.ll @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 54457678186b
children 803732b1fca8
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95c75e76d11b LLVM 3.4
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1 ; RUN: llc < %s -march=x86 -mtriple=i386-apple-darwin | FileCheck %s
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2 ; PR8297
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3 ;
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4 ; On i386, i64 cmpxchg is lowered during legalize types to extract the
95c75e76d11b LLVM 3.4
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5 ; 64-bit result into a pair of fixed regs. So creation of the DAG node
95c75e76d11b LLVM 3.4
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6 ; happens in a different place. See
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7 ; X86TargetLowering::ReplaceNodeResults, case ATOMIC_CMP_SWAP.
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8 ;
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9 ; Neither Atomic-xx.ll nor atomic_op.ll cover this. Those tests were
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10 ; autogenerated from C source before 64-bit variants were supported.
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11 ;
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12 ; Note that this case requires a loop around the cmpxchg to force
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13 ; machine licm to query alias anlysis, exposing a bad
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14 ; MachineMemOperand.
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15 define void @foo(i64* %ptr) nounwind inlinehint {
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16 entry:
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17 br label %loop
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18 loop:
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afa8332a0e37 LLVM 3.8
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19 ; CHECK: lock cmpxchg8b
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54457678186b LLVM 3.6
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20 %pair = cmpxchg i64* %ptr, i64 0, i64 1 monotonic monotonic
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21 %r = extractvalue { i64, i1 } %pair, 0
0
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22 %stored1 = icmp eq i64 %r, 0
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23 br i1 %stored1, label %loop, label %continue
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24 continue:
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25 ret void
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26 }