From 5def57aaf477e3383cbd1b925233098a54273146 Mon Sep 17 00:00:00 2001 From: Jim Grosbach Date: Wed, 23 Jun 2010 16:08:49 +0000 Subject: [PATCH] When using libcall expansions for the atomic intrinsics, the explicit MEMBARRIER fences aren't necessary for ARM. Tell the combiner to fold them away. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106631 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/ARM/ARMISelLowering.cpp | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp index 7f89b2d1685..97a5f9da120 100644 --- a/lib/Target/ARM/ARMISelLowering.cpp +++ b/lib/Target/ARM/ARMISelLowering.cpp @@ -441,6 +441,8 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM) setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i8, Expand); setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i16, Expand); setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i32, Expand); + // Since the libcalls include locking, fold in the fences + setShouldFoldAtomicFences(true); } // 64-bit versions are always libcalls (for now) setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i64, Expand);