diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 203c8733aa..2810f4200d 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -14532,13 +14532,12 @@ static SDValue PerformSTORECombine(SDNode *N, SelectionDAG &DAG, const TargetLowering &TLI = DAG.getTargetLoweringInfo(); // If we are saving a concatenation 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 && + // On Sandy Bridge, 256-bit memory operations are executed by two + // 128-bit ports. However, on Haswell it is better to issue a single 256-bit + // memory operation. + if (VT.getSizeInBits() == 256 && !Subtarget->hasAVX2() && StoredVal.getNode()->getOpcode() == ISD::CONCAT_VECTORS && StoredVal.getNumOperands() == 2) { - SDValue Value0 = StoredVal.getOperand(0); SDValue Value1 = StoredVal.getOperand(1); |