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- Remove the hacky code that forces a memcpy. Alignment is taken care of in the

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FE.
- Explicitly pass in the alignment of the load & store.
- XFAIL 2007-10-23-UnalignedMemcpy.ll because llc has a bug that crashes on
  unaligned pointers.

llvm-svn: 43398
This commit is contained in:
Bill Wendling 2007-10-26 20:24:42 +00:00
parent 87e1cadc06
commit 8d329ff809
2 changed files with 4 additions and 11 deletions
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14
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -4329,14 +4329,6 @@ void SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) {
}
}
// The lowered load/store instructions from/to the stack frame can be
// unaligned depending on whether it's accessed off sp or fp. If this is
// the case, then just use the memcpy library call.
if (Op1.getOpcode() == ISD::FrameIndex ||
Op2.getOpcode() == ISD::FrameIndex)
if (Size->getValue() % Align != 0)
break;
for (unsigned i = 0; i < NumMemOps; i++) {
MVT::ValueType VT = MemOps[i];
unsigned VTSize = MVT::getSizeInBits(VT) / 8;
@ -4351,13 +4343,13 @@ void SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) {
I.getOperand(1), DstOff);
} else {
Value = DAG.getLoad(VT, getRoot(),
getMemBasePlusOffset(Op2, SrcOff, DAG, TLI),
I.getOperand(2), SrcOff);
getMemBasePlusOffset(Op2, SrcOff, DAG, TLI),
I.getOperand(2), SrcOff, false, Align);
Chain = Value.getValue(1);
Store =
DAG.getStore(Chain, Value,
getMemBasePlusOffset(Op1, DstOff, DAG, TLI),
I.getOperand(1), DstOff);
I.getOperand(1), DstOff, false, Align);
}
OutChains.push_back(Store);
SrcOff += VTSize;

1
test/CodeGen/PowerPC/2007-10-23-UnalignedMemcpy.ll
View File

@ -1,4 +1,5 @@
; RUN: llvm-as < %s | llc -mtriple=powerpc64-apple-darwin9 -o - | grep memcpy
; XFAIL: *
@C.0.1173 = external constant [33 x i8] ; <[33 x i8]*> [#uses=1]