Revision: 17428
Author: [email protected]
Date: Tue Oct 29 14:34:07 2013 UTC
Log: ia32: Fix comparisons of two constant double operands when
exactly one of them is in new space.
[email protected]
Review URL: https://codereview.chromium.org/46883008
http://code.google.com/p/v8/source/detail?r=17428
Added:
/branches/bleeding_edge/test/mjsunit/regress/regress-compare-constant-doubles.js
Modified:
/branches/bleeding_edge/src/ia32/lithium-ia32.cc
=======================================
--- /dev/null
+++
/branches/bleeding_edge/test/mjsunit/regress/regress-compare-constant-doubles.js
Tue Oct 29 14:34:07 2013 UTC
@@ -0,0 +1,58 @@
+// Copyright 2013 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 left = 1.5;
+var right;
+
+var keepalive;
+
+function foo() {
+ // Fill XMM registers with cruft.
+ var a1 = Math.sin(1) + 10;
+ var a2 = a1 + 1;
+ var a3 = a2 + 1;
+ var a4 = a3 + 1;
+ var a5 = a4 + 1;
+ var a6 = a5 + 1;
+ keepalive = [a1, a2, a3, a4, a5, a6];
+
+ // Actual test.
+ if (left < right) return "ok";
+ return "bad";
+}
+
+function prepare(base) {
+ right = 0.5 * base;
+}
+
+prepare(21);
+assertEquals("ok", foo());
+assertEquals("ok", foo());
+%OptimizeFunctionOnNextCall(foo);
+assertEquals("ok", foo());
=======================================
--- /branches/bleeding_edge/src/ia32/lithium-ia32.cc Wed Oct 23 16:57:57
2013 UTC
+++ /branches/bleeding_edge/src/ia32/lithium-ia32.cc Tue Oct 29 14:34:07
2013 UTC
@@ -1728,9 +1728,12 @@
ASSERT(instr->right()->representation().IsDouble());
LOperand* left;
LOperand* right;
- if (instr->left()->IsConstant() && instr->right()->IsConstant()) {
- left = UseRegisterOrConstantAtStart(instr->left());
- right = UseRegisterOrConstantAtStart(instr->right());
+ if (CanBeImmediateConstant(instr->left()) &&
+ CanBeImmediateConstant(instr->right())) {
+ // The code generator requires either both inputs to be constant
+ // operands, or neither.
+ left = UseConstant(instr->left());
+ right = UseConstant(instr->right());
} else {
left = UseRegisterAtStart(instr->left());
right = UseRegisterAtStart(instr->right());
--
--
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