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Add XCore support for ATOMIC_FENCE.

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ATOMIC_FENCE is lowered to a compiler barrier which is codegen only. There
is no need to emit an instructions since the XCore provides sequential
consistency.

Original patch by Richard Osborne

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194464 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Robert Lytton
2013-11-12 10:11:26 +00:00
parent c17ea93ed5
commit 32e8528c33
4 changed files with 41 additions and 1 deletions
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16
test/CodeGen/XCore/atomic.ll Normal file
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@@ -0,0 +1,16 @@
; RUN: llc < %s -march=xcore | FileCheck %s
; CHECK-LABEL: atomic_fence
; CHECK: #MEMBARRIER
; CHECK: #MEMBARRIER
; CHECK: #MEMBARRIER
; CHECK: #MEMBARRIER
; CHECK: retsp 0
define void @atomic_fence() nounwind {
entry:
fence acquire
fence release
fence acq_rel
fence seq_cst
ret void
}