From 7752442bfa1213b302d421988813e3b1cec6b796 Mon Sep 17 00:00:00 2001 From: Eli Friedman Date: Wed, 4 Aug 2010 22:40:58 +0000 Subject: PR7814: Truncates cannot be ignored for signed comparisons. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110268 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/X86ISelDAGToDAG.cpp | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'lib/Target/X86') diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp index 72f2bc1..4301d76 100644 --- a/lib/Target/X86/X86ISelDAGToDAG.cpp +++ b/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() && -- cgit v1.1