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Adjust offset to compensate for big endian machines.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35293 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-03-24 00:02:43 +00:00
parent 3b5ee73a13
commit dae54ce7fc
1 changed files with 5 additions and 7 deletions
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12
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -2292,7 +2292,6 @@ SDOperand DAGCombiner::ReduceLoadWidth(SDNode *N) {
N0 = N0.getOperand(0);
if (MVT::getSizeInBits(N0.getValueType()) <= EVTBits)
return SDOperand();
ShAmt /= 8;
CombineSRL = true;
}
}
@ -2308,12 +2307,11 @@ SDOperand DAGCombiner::ReduceLoadWidth(SDNode *N) {
"Cannot truncate to larger type!");
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
MVT::ValueType PtrType = N0.getOperand(1).getValueType();
// For big endian targets, we need to add an offset to the pointer to load
// the correct bytes. For little endian systems, we merely need to read
// fewer bytes from the same pointer.
uint64_t PtrOff = ShAmt
? ShAmt : (TLI.isLittleEndian() ? 0
: (MVT::getSizeInBits(N0.getValueType()) - EVTBits) / 8);
// For big endian targets, we need to adjust the offset to the pointer to
// load the correct bytes.
if (!TLI.isLittleEndian())
ShAmt = MVT::getSizeInBits(N0.getValueType()) - ShAmt - EVTBits;
uint64_t PtrOff = ShAmt / 8;
SDOperand NewPtr = DAG.getNode(ISD::ADD, PtrType, LN0->getBasePtr(),
DAG.getConstant(PtrOff, PtrType));
AddToWorkList(NewPtr.Val);