diff options
| author | Dan Gohman <gohman@apple.com> | 2009-02-24 02:00:40 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-02-24 02:00:40 +0000 |
| commit | 0001e56f15215ae4bc5fffb82eec5c4828b888f0 (patch) | |
| tree | c14953e84d899048fdcd5828b6b2b4ecac2ccb2a /lib/CodeGen/SelectionDAG/SelectionDAG.cpp | |
| parent | c34fea3935dcc0cab13cfb5cb60471bd49089230 (diff) | |
Fix a ValueTracking rule: RHS means operand 1, not 0. Add a simple
ashr instcombine to help expose this code. And apply the fix to
SelectionDAG's copy of this code too.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65364 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 66356f5f9a..358c9703a8 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -2008,7 +2008,7 @@ unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, unsigned Depth) const{ if (Tmp == 1) return 1; // Early out. // Special case decrementing a value (ADD X, -1): - if (ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) + if (ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(Op.getOperand(1))) if (CRHS->isAllOnesValue()) { APInt KnownZero, KnownOne; APInt Mask = APInt::getAllOnesValue(VTBits); |