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Don't create indexed load / store with zero offset!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36716 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-05-03 23:52:19 +00:00
parent bdc9869dbf
commit a7d4a04d24
1 changed files with 8 additions and 0 deletions
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8
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -3110,6 +3110,10 @@ bool DAGCombiner::CombineToPreIndexedLoadStore(SDNode *N) {
ISD::MemIndexedMode AM = ISD::UNINDEXED; ISD::MemIndexedMode AM = ISD::UNINDEXED;
if (!TLI.getPreIndexedAddressParts(N, BasePtr, Offset, AM, DAG)) if (!TLI.getPreIndexedAddressParts(N, BasePtr, Offset, AM, DAG))
return false; return false;
// Don't create a indexed load / store with zero offset.
if (isa<ConstantSDNode>(Offset) &&
cast<ConstantSDNode>(Offset)->getValue() == 0)
return false;
// Try turning it into a pre-indexed load / store except when: // Try turning it into a pre-indexed load / store except when:
// 1) The base is a frame index. // 1) The base is a frame index.
@ -3239,6 +3243,10 @@ bool DAGCombiner::CombineToPostIndexedLoadStore(SDNode *N) {
std::swap(BasePtr, Offset); std::swap(BasePtr, Offset);
if (Ptr != BasePtr) if (Ptr != BasePtr)
continue; continue;
// Don't create a indexed load / store with zero offset.
if (isa<ConstantSDNode>(Offset) &&
cast<ConstantSDNode>(Offset)->getValue() == 0)
continue;
// Try turning it into a post-indexed load / store except when // Try turning it into a post-indexed load / store except when
// 1) All uses are load / store ops that use it as base ptr. // 1) All uses are load / store ops that use it as base ptr.