Support register as right operand in min/max support.

R=jkummerow@chromium.org
BUG=chromium:145961
TEST=mjsunit/regress/regress-crbug-145961.js

Review URL: https://chromiumcodereview.appspot.com/10914072

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12434 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/lithium-codegen-x64.cc

@@ -1421,6 +1421,11 @@ void LCodeGen::DoMathMinMax(LMathMinMax* instr) {
       __ cmpq(left_reg, right_imm);
       __ j(condition, &return_left, Label::kNear);
       __ movq(left_reg, right_imm);
+    } else if (right->IsRegister()) {
+      Register right_reg = ToRegister(right);
+      __ cmpq(left_reg, right_reg);
+      __ j(condition, &return_left, Label::kNear);
+      __ movq(left_reg, right_reg);
     } else {
       Operand right_op = ToOperand(right);
       __ cmpq(left_reg, right_op);

test/mjsunit/regress/regress-crbug-145961.js

+// Copyright 2012 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// This test causes the operands to be passed in as Integer32 registers.
+// Flags: --allow-natives-syntax
+function test() {
+  var a = new Int32Array(2);
+  var x = a[0];
+  return Math.min(x, x);
+}
+
+assertEquals(-1, test());
+assertEquals(-1, test());
+%OptimizeFunctionOnNextCall(test);
+assertEquals(-1, test());