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Add a comment about using libc memset/memcpy or generating inline code.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41502 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2007-08-27 17:48:26 +00:00
parent 56fe9b7396
commit 44c8265cf8
1 changed files with 5 additions and 2 deletions
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7
lib/Target/X86/X86ISelLowering.cpp
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@ -3754,7 +3754,8 @@ SDOperand X86TargetLowering::LowerMEMSET(SDOperand Op, SelectionDAG &DAG) {
ConstantSDNode *I = dyn_cast<ConstantSDNode>(Op.getOperand(3));
// If not DWORD aligned or size is more than the threshold, call memset.
// It knows how to align to the right boundary first.
// The libc version is likely to be faster for these cases. It can use the
// address value and run time information about the CPU.
if ((Align & 3) != 0 ||
(I && I->getValue() > Subtarget->getMinRepStrSizeThreshold())) {
MVT::ValueType IntPtr = getPointerTy();
@ -3910,7 +3911,9 @@ SDOperand X86TargetLowering::LowerMEMCPY(SDOperand Op, SelectionDAG &DAG) {
ConstantSDNode *I = dyn_cast<ConstantSDNode>(Op.getOperand(3));
// If not DWORD aligned or size is more than the threshold, call memcpy.
// It knows how to align to the right boundary first.
// The libc version is likely to be faster for these cases. It can use the
// address value and run time information about the CPU.
// With glibc 2.6.1 on a core 2, coping an array of 100M longs was 30% faster
if ((Align & 3) != 0 ||
(I && I->getValue() > Subtarget->getMinRepStrSizeThreshold())) {
MVT::ValueType IntPtr = getPointerTy();