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| author | Eli Friedman <eli.friedman@gmail.com> | 2010-08-04 22:40:58 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2010-08-04 22:40:58 +0000 |
| commit | 39d0f57cab1d85e0eeae298a08cff6510f30b371 (patch) | |
| tree | 825bc72566f5aee432e6d8837bffac335f070311 /llvm/lib/Target | |
| parent | a52ddc496ab26fb2f4dc4e11ac2f799502be0c25 (diff) | |
| download | bcm5719-llvm-39d0f57cab1d85e0eeae298a08cff6510f30b371.tar.gz bcm5719-llvm-39d0f57cab1d85e0eeae298a08cff6510f30b371.zip | |
PR7814: Truncates cannot be ignored for signed comparisons.
llvm-svn: 110268
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelDAGToDAG.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp index 72f2bc11d7c..4301d7685b5 100644 --- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp +++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp @@ -1841,7 +1841,8 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) { // Look for (X86cmp (and $op, $imm), 0) and see if we can convert it to // use a smaller encoding. - if (N0.getOpcode() == ISD::TRUNCATE && N0.hasOneUse()) + if (N0.getOpcode() == ISD::TRUNCATE && N0.hasOneUse() && + HasNoSignedComparisonUses(Node)) // Look past the truncate if CMP is the only use of it. N0 = N0.getOperand(0); if (N0.getNode()->getOpcode() == ISD::AND && N0.getNode()->hasOneUse() && |
