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It is only supported for ARM code. Normally Thumb2 code would use DMB instead, but depending on how the compiler is invoked (e.g., -mattr=-db) that might be disabled. This prevents a "cannot select MEMBARRIER_MCR" error in that situation. Radar 8644195 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118642 91177308-0d34-0410-b5e6-96231b3b80d8
26 lines
676 B
LLVM
26 lines
676 B
LLVM
; RUN: llc < %s -mtriple=thumbv6-apple-darwin | FileCheck %s -check-prefix=V6
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; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mattr=-db | FileCheck %s -check-prefix=V6
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; RUN: llc < %s -march=thumb -mattr=+v6m | FileCheck %s -check-prefix=V6M
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declare void @llvm.memory.barrier(i1 , i1 , i1 , i1 , i1)
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define void @t1() {
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; V6: t1:
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; V6: blx {{_*}}sync_synchronize
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; V6M: t1:
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; V6M: dmb st
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call void @llvm.memory.barrier(i1 false, i1 false, i1 false, i1 true, i1 true)
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ret void
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}
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define void @t2() {
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; V6: t2:
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; V6: blx {{_*}}sync_synchronize
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; V6M: t2:
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; V6M: dmb ish
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call void @llvm.memory.barrier(i1 true, i1 false, i1 false, i1 true, i1 false)
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ret void
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}
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