[arm64] Use CMN for cmp(a,sub(0,b)) only when checking equality/inequality.

test/mjsunit/compiler/regress-compare-negate.js

Index: test/mjsunit/compiler/regress-compare-negate.js
diff --git a/test/mjsunit/compiler/regress-compare-negate.js b/test/mjsunit/compiler/regress-compare-negate.js
new file mode 100644
index 0000000000000000000000000000000000000000..72b210b1e431e88228695b6854cba3276d18d8b7
--- /dev/null
+++ b/test/mjsunit/compiler/regress-compare-negate.js
@@ -0,0 +1,18 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax --turbo
+
+function CompareNegate(a,b) {
+ a = a|0;
+ b = b|0;
+ var sub = 0 - b;
+ return a < (sub|0);
+}
+
+var x = CompareNegate(1,0x80000000);
+%OptimizeFunctionOnNextCall(CompareNegate);
+CompareNegate(1,0x80000000);
+assertOptimized(CompareNegate);
+assertEquals(x, CompareNegate(1,0x80000000));