Avoid wrong imul deopt on ia32 and x64 (fixes v8 bug 2339).

BUG=v8:2339

Review URL: https://chromiumcodereview.appspot.com/10963032

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12614 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/lithium-codegen-ia32.cc

@@ -1234,8 +1234,11 @@ void LCodeGen::DoMulI(LMulI* instr) {
     __ test(left, Operand(left));
     __ j(not_zero, &done, Label::kNear);
     if (right->IsConstantOperand()) {
-      if (ToInteger32(LConstantOperand::cast(right)) <= 0) {
+      if (ToInteger32(LConstantOperand::cast(right)) < 0) {
         DeoptimizeIf(no_condition, instr->environment());
+      } else if (ToInteger32(LConstantOperand::cast(right)) == 0) {
+        __ cmp(ToRegister(instr->temp()), Immediate(0));
+        DeoptimizeIf(less, instr->environment());
       }
     } else {
       // Test the non-zero operand for negative sign.

src/x64/lithium-codegen-x64.cc

@@ -1125,8 +1125,11 @@ void LCodeGen::DoMulI(LMulI* instr) {
     __ testl(left, left);
     __ j(not_zero, &done, Label::kNear);
     if (right->IsConstantOperand()) {
-      if (ToInteger32(LConstantOperand::cast(right)) <= 0) {
+      if (ToInteger32(LConstantOperand::cast(right)) < 0) {
         DeoptimizeIf(no_condition, instr->environment());
+      } else if (ToInteger32(LConstantOperand::cast(right)) == 0) {
+        __ cmpl(kScratchRegister, Immediate(0));
+        DeoptimizeIf(less, instr->environment());
       }
     } else if (right->IsStackSlot()) {
       __ orl(kScratchRegister, ToOperand(right));

test/mjsunit/regress/regress-1117.js

@@ -25,11 +25,20 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+// Flags: --allow-natives-syntax
+
 // Test that we actually return the right value (-0) when we multiply
 // constant 0 with a negative integer.
 
 function foo(y) {return 0 * y; }
-for( var i = 0; i< 1000000; i++){
-  foo(42);
-}
 assertEquals(1/foo(-42), -Infinity);
+assertEquals(1/foo(-42), -Infinity);
+%OptimizeFunctionOnNextCall(foo);
+assertEquals(1/foo(-42), -Infinity);
+
+function bar(x) { return x * 0; }
+assertEquals(Infinity, 1/bar(5));
+assertEquals(Infinity, 1/bar(5));
+%OptimizeFunctionOnNextCall(bar);
+assertEquals(-Infinity, 1/bar(-5));
+

test/mjsunit/regress/regress-2339.js

@@ -0,0 +1,59 @@
+// 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.
+
+// Flags: --allow-natives-syntax --expose-gc
+
+/**
+ * The possible optimization states of a function. Must be in sync with the
+ * return values of Runtime_GetOptimizationStatus() in runtime.cc!
+ */
+
+var OptimizationState = {
+    YES: 1,
+    NO: 2,
+    ALWAYS: 3,
+    NEVER: 4
+};
+
+function simple() {
+  return simple_two_args(0, undefined);
+}
+
+function simple_two_args(always_zero, always_undefined) {
+  var always_five = always_undefined || 5;
+  return always_zero * always_five * .5;
+}
+
+
+simple();
+simple();
+%OptimizeFunctionOnNextCall(simple);
+simple();
+var raw_optimized = %GetOptimizationStatus(simple);
+assertFalse(raw_optimized == OptimizationState.NO);
+gc();
+