diff options
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 94faae5b55..666ce3c07e 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -12593,6 +12593,9 @@ static SDValue PerformSTORECombine(SDNode *N, SelectionDAG &DAG, const TargetLowering &TLI = DAG.getTargetLoweringInfo(); // If we are saving a concatination of two XMM registers, perform two stores. + // This is better in Sandy Bridge cause one 256-bit mem op is done via two + // 128-bit ones. If in the future the cost becomes only one memory access the + // first version would be better. if (VT.getSizeInBits() == 256 && StoredVal.getNode()->getOpcode() == ISD::CONCAT_VECTORS && StoredVal.getNumOperands() == 2) { |