diff options
| author | Chris Lattner <sabre@nondot.org> | 2007-12-06 07:44:31 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2007-12-06 07:44:31 +0000 |
| commit | e00cbad78de86ac8e736f35db35632c83ef64c1d (patch) | |
| tree | 9c632b56f0ac8e00782f54c52276b569cb9b423a /lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | e70da20f9a7edb15e1d9bd221839e2ff26e40955 (diff) | |
Actually, disable this code for now. More analysis and improvements to
the X86 backend are needed before this should be enabled by default.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44657 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 918db38353..ba3c0ac33d 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -2134,6 +2134,12 @@ SDOperand DAGCombiner::visitXOR(SDNode *N) { /// visitShiftByConstant - Handle transforms common to the three shifts, when /// the shift amount is a constant. SDOperand DAGCombiner::visitShiftByConstant(SDNode *N, unsigned Amt) { + // FIXME: disable this for now. This pessimizes some common cases like: + // + //void foo(int *X, int i) { X[i & 1235] = 1; } + //int bar(int *X, int i) { return X[i & 255]; } + return SDOperand(); + SDNode *LHS = N->getOperand(0).Val; if (!LHS->hasOneUse()) return SDOperand(); |