diff options
| author | Evan Cheng <evan.cheng@apple.com> | 2007-03-23 20:55:21 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2007-03-23 20:55:21 +0000 |
| commit | b37b80ce4669c41dcebaeb227b15f552b2c24210 (patch) | |
| tree | daea589ef063ad2a3493cc3c9059ed17184be975 /lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | 5d787bb93e08f0536b1b7b9d53af958508c29de2 (diff) | |
Also replace uses of SRL if that's also folded during ReduceLoadWidth().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35286 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 1aea2ed35f..df951a51bb 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -2279,6 +2279,7 @@ SDOperand DAGCombiner::ReduceLoadWidth(SDNode *N) { unsigned EVTBits = MVT::getSizeInBits(EVT); unsigned ShAmt = 0; + bool CombineSRL = false; if (N0.getOpcode() == ISD::SRL && N0.hasOneUse()) { if (ConstantSDNode *N01 = dyn_cast<ConstantSDNode>(N0.getOperand(1))) { ShAmt = N01->getValue(); @@ -2288,6 +2289,7 @@ SDOperand DAGCombiner::ReduceLoadWidth(SDNode *N) { if (MVT::getSizeInBits(N0.getValueType()) <= EVTBits) return SDOperand(); ShAmt /= 8; + CombineSRL = true; } } } @@ -2317,7 +2319,12 @@ SDOperand DAGCombiner::ReduceLoadWidth(SDNode *N) { : DAG.getExtLoad(ExtType, VT, LN0->getChain(), NewPtr, LN0->getSrcValue(), LN0->getSrcValueOffset(), EVT); AddToWorkList(N); - CombineTo(N0.Val, Load, Load.getValue(1)); + if (CombineSRL) { + std::vector<SDNode*> NowDead; + DAG.ReplaceAllUsesOfValueWith(N0.getValue(1), Load.getValue(1), NowDead); + CombineTo(N->getOperand(0).Val, Load); + } else + CombineTo(N0.Val, Load, Load.getValue(1)); if (ShAmt) return DAG.getNode(N->getOpcode(), VT, Load); return SDOperand(N, 0); // Return N so it doesn't get rechecked! |