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Dumb bug. Code sees a memcpy from X+c so it increments src offset. But it

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turns out not to point to a constant string but it forgot change the offset
back.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26242 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-02-16 23:11:42 +00:00
parent fe5cb19405
commit cffbb5174f
1 changed files with 10 additions and 4 deletions
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14
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -1658,9 +1658,10 @@ void SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) {
if (MeetsMaxMemopRequirement(MemOps, TLI.getMaxStoresPerMemcpy(), if (MeetsMaxMemopRequirement(MemOps, TLI.getMaxStoresPerMemcpy(),
Size->getValue(), Align, TLI)) { Size->getValue(), Align, TLI)) {
unsigned NumMemOps = MemOps.size(); unsigned NumMemOps = MemOps.size();
unsigned SrcOff = 0, DstOff = 0; unsigned SrcOff = 0, DstOff = 0, SrcDelta = 0;
GlobalAddressSDNode *G = NULL; GlobalAddressSDNode *G = NULL;
std::string Str; std::string Str;
bool CopyFromStr = false;
if (Op2.getOpcode() == ISD::GlobalAddress) if (Op2.getOpcode() == ISD::GlobalAddress)
G = cast<GlobalAddressSDNode>(Op2); G = cast<GlobalAddressSDNode>(Op2);
@ -1668,12 +1669,17 @@ void SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) {
Op2.getOperand(0).getOpcode() == ISD::GlobalAddress && Op2.getOperand(0).getOpcode() == ISD::GlobalAddress &&
Op2.getOperand(1).getOpcode() == ISD::Constant) { Op2.getOperand(1).getOpcode() == ISD::Constant) {
G = cast<GlobalAddressSDNode>(Op2.getOperand(0)); G = cast<GlobalAddressSDNode>(Op2.getOperand(0));
SrcOff += cast<ConstantSDNode>(Op2.getOperand(1))->getValue(); SrcDelta = cast<ConstantSDNode>(Op2.getOperand(1))->getValue();
} }
if (G) { if (G) {
GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal()); GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal());
if (GV) if (GV) {
Str = getStringValue(GV); Str = getStringValue(GV);
if (!Str.empty()) {
CopyFromStr = true;
SrcOff += SrcDelta;
}
}
} }
for (unsigned i = 0; i < NumMemOps; i++) { for (unsigned i = 0; i < NumMemOps; i++) {
@ -1681,7 +1687,7 @@ void SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) {
unsigned VTSize = getSizeInBits(VT) / 8; unsigned VTSize = getSizeInBits(VT) / 8;
SDOperand Value, Chain, Store; SDOperand Value, Chain, Store;
if (!Str.empty()) { if (CopyFromStr) {
Value = getMemsetStringVal(VT, DAG, TLI, Str, SrcOff); Value = getMemsetStringVal(VT, DAG, TLI, Str, SrcOff);
Chain = getRoot(); Chain = getRoot();
Store = Store =