Don't use an explicit s0 in ClampDoubleToUint8.

R=fschneider@chromium.org
BUG=v8:2004
TEST=test/mjsunit/pixel-array-rounding.js

Review URL: https://chromiumcodereview.appspot.com/9702027

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11053 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/macro-assembler-arm.cc

@@ -3647,8 +3647,8 @@ void MacroAssembler::ClampDoubleToUint8(Register result_reg,
   bind(&in_bounds);
   Vmov(temp_double_reg, 0.5);
   vadd(temp_double_reg, input_reg, temp_double_reg);
-  vcvt_u32_f64(s0, temp_double_reg);
-  vmov(result_reg, s0);
+  vcvt_u32_f64(temp_double_reg.low(), temp_double_reg);
+  vmov(result_reg, temp_double_reg.low());
   bind(&done);
 }
 

test/mjsunit/pixel-array-rounding.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.
+
+// Flags: --allow-natives-syntax
+
+var pixels = new PixelArray(8);
+
+function f() {
+  for (var i = 0; i < 8; i++) {
+    pixels[i] = (i * 1.1);
+  }
+  return pixels[1] + pixels[6];
+}
+
+f();
+f();
+assertEquals(6, pixels[5]);
+%OptimizeFunctionOnNextCall(f);
+f();
+assertEquals(6, pixels[5]);