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| author | Dan Gohman <gohman@apple.com> | 2009-01-03 19:22:06 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-01-03 19:22:06 +0000 |
| commit | b9fa1d24f89d0c34e77dd855797017185ab9ba8d (patch) | |
| tree | 17d230a508322752e46621b45b230a66344a2e07 /llvm/lib | |
| parent | 4d41fdf4cabc01dddcb36cd420d83debf90460e3 (diff) | |
| download | bcm5719-llvm-b9fa1d24f89d0c34e77dd855797017185ab9ba8d.tar.gz bcm5719-llvm-b9fa1d24f89d0c34e77dd855797017185ab9ba8d.zip | |
Fix a DAGCombiner abort on an invalid shift count constant. This fixes PR3250.
llvm-svn: 61613
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 4fb50e30dbe..f1e43a90246 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -3277,6 +3277,8 @@ SDValue DAGCombiner::GetDemandedBits(SDValue V, const APInt &Mask) { if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(V.getOperand(1))) { // See if we can recursively simplify the LHS. unsigned Amt = RHSC->getZExtValue(); + // Watch out for shift count overflow though. + if (Amt >= Mask.getBitWidth()) break; APInt NewMask = Mask << Amt; SDValue SimplifyLHS = GetDemandedBits(V.getOperand(0), NewMask); if (SimplifyLHS.getNode()) { |
