Enable i16 to i32 promotion by default.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102493 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp
index d6744d1..1c42639 100644
--- a/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -1854,6 +1854,9 @@
// 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())
+ // 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() &&
N0.getValueType() != MVT::i8 &&
X86::isZeroNode(N1)) {