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R600: Add comments to subword private address load lowering code

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v2: Use C++ comments and end with periods

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-by: Matt Arsenault <Matthew.Arsenault@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238228 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jan Vesely 2015-05-26 18:07:21 +00:00
parent 9c24c958f1
commit 0704171907
1 changed files with 13 additions and 0 deletions
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13
lib/Target/R600/AMDGPUISelLowering.cpp
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@ -1451,22 +1451,34 @@ SDValue AMDGPUTargetLowering::LowerLOAD(SDValue Op, SelectionDAG &DAG) const {
ExtType == ISD::NON_EXTLOAD || Load->getMemoryVT().bitsGE(MVT::i32))
return SDValue();
// <SI && AS=PRIVATE && EXTLOAD && size < 32bit,
// register (2-)byte extract.
// Get Register holding the target.
SDValue Ptr = DAG.getNode(ISD::SRL, DL, MVT::i32, Load->getBasePtr(),
DAG.getConstant(2, DL, MVT::i32));
// Load the Register.
SDValue Ret = DAG.getNode(AMDGPUISD::REGISTER_LOAD, DL, Op.getValueType(),
Load->getChain(), Ptr,
DAG.getTargetConstant(0, DL, MVT::i32),
Op.getOperand(2));
// Get offset within the register.
SDValue ByteIdx = DAG.getNode(ISD::AND, DL, MVT::i32,
Load->getBasePtr(),
DAG.getConstant(0x3, DL, MVT::i32));
// Bit offset of target byte (byteIdx * 8).
SDValue ShiftAmt = DAG.getNode(ISD::SHL, DL, MVT::i32, ByteIdx,
DAG.getConstant(3, DL, MVT::i32));
// Shift to the right.
Ret = DAG.getNode(ISD::SRL, DL, MVT::i32, Ret, ShiftAmt);
// Eliminate the upper bits by setting them to ...
EVT MemEltVT = MemVT.getScalarType();
// ... ones.
if (ExtType == ISD::SEXTLOAD) {
SDValue MemEltVTNode = DAG.getValueType(MemEltVT);
@ -1478,6 +1490,7 @@ SDValue AMDGPUTargetLowering::LowerLOAD(SDValue Op, SelectionDAG &DAG) const {
return DAG.getMergeValues(Ops, DL);
}
// ... or zeros.
SDValue Ops[] = {
DAG.getZeroExtendInReg(Ret, DL, MemEltVT),
Load->getChain()