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| author | Matt Arsenault <Matthew.Arsenault@amd.com> | 2013-11-15 04:42:23 +0000 |
|---|---|---|
| committer | Matt Arsenault <Matthew.Arsenault@amd.com> | 2013-11-15 04:42:23 +0000 |
| commit | 509a492442b7e889d615d3b451629c81a810aef1 (patch) | |
| tree | d4facf4559ba4d9a84d7792f6e697ea2a7909d2d /lib/CodeGen/SelectionDAG | |
| parent | a0846f414366462d24e65b48deea6b2b85f6616b (diff) | |
| download | llvm-509a492442b7e889d615d3b451629c81a810aef1.tar.gz llvm-509a492442b7e889d615d3b451629c81a810aef1.tar.bz2 llvm-509a492442b7e889d615d3b451629c81a810aef1.tar.xz | |
Add target hook to prevent folding some bitcasted loads.
This is to avoid this transformation in some cases:
fold (conv (load x)) -> (load (conv*)x)
On architectures that don't natively support some vector
loads efficiently casting the load to a smaller vector of
larger types and loading is more efficient.
Patch by Micah Villmow.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194783 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 90cd1d3ee2..78543a4113 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -5768,7 +5768,8 @@ SDValue DAGCombiner::visitBITCAST(SDNode *N) { if (ISD::isNormalLoad(N0.getNode()) && N0.hasOneUse() && // Do not change the width of a volatile load. !cast<LoadSDNode>(N0)->isVolatile() && - (!LegalOperations || TLI.isOperationLegal(ISD::LOAD, VT))) { + (!LegalOperations || TLI.isOperationLegal(ISD::LOAD, VT)) && + TLI.isLoadBitCastBeneficial(N0.getValueType(), VT)) { LoadSDNode *LN0 = cast<LoadSDNode>(N0); unsigned Align = TLI.getDataLayout()-> getABITypeAlignment(VT.getTypeForEVT(*DAG.getContext())); |