Index: src/compiler/machine-operator-reducer.cc |
diff --git a/src/compiler/machine-operator-reducer.cc b/src/compiler/machine-operator-reducer.cc |
index 3a723c3196942b425bfb64f50c3db3eb32133e81..4aeeeeacfcf2670d7b19059eeceeaa40dae2616f 100644 |
--- a/src/compiler/machine-operator-reducer.cc |
+++ b/src/compiler/machine-operator-reducer.cc |
@@ -264,6 +264,14 @@ Reduction MachineOperatorReducer::Reduce(Node* node) { |
return ReplaceBool(m.left().Value() < m.right().Value()); |
} |
if (m.LeftEqualsRight()) return ReplaceBool(false); // x < x => false |
+ if (m.left().IsWord32Or() && m.right().Is(0)) { |
+ // (x | K) < 0 => true or (K | x) < 0 => true iff K < 0 |
+ Int32BinopMatcher mleftmatcher(m.left().node()); |
+ if (mleftmatcher.left().IsNegative() || |
+ mleftmatcher.right().IsNegative()) { |
+ return ReplaceBool(true); |
+ } |
+ } |
break; |
} |
case IrOpcode::kInt32LessThanOrEqual: { |