Commit 38610630 authored by ulan@chromium.org's avatar ulan@chromium.org

Check for NaN in inlined versions of Math.min, Math.max.

R=danno@chromium.org
BUG=V8:2056
TEST=mjsunit/regress/regress-2056.js

Review URL: https://chromiumcodereview.appspot.com/10006008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11237 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
parent 3c6f5774
......@@ -5730,7 +5730,27 @@ bool HGraphBuilder::TryInlineBuiltinMethodCall(Call* expr,
set_current_block(return_left);
Push(left);
set_current_block(return_right);
Push(right);
// The branch above always returns the right operand if either of
// them is NaN, but the spec requires that max/min(NaN, X) = NaN.
// We add another branch that checks if the left operand is NaN or not.
if (left_operand->representation().IsDouble()) {
// If left_operand != left_operand then it is NaN.
HCompareIDAndBranch* compare_nan = new(zone()) HCompareIDAndBranch(
left_operand, left_operand, Token::EQ);
compare_nan->SetInputRepresentation(left_operand->representation());
HBasicBlock* left_is_number = graph()->CreateBasicBlock();
HBasicBlock* left_is_nan = graph()->CreateBasicBlock();
compare_nan->SetSuccessorAt(0, left_is_number);
compare_nan->SetSuccessorAt(1, left_is_nan);
current_block()->Finish(compare_nan);
set_current_block(left_is_nan);
Push(left);
set_current_block(left_is_number);
Push(right);
return_right = CreateJoin(left_is_number, left_is_nan, expr->id());
} else {
Push(right);
}
HBasicBlock* join = CreateJoin(return_left, return_right, expr->id());
set_current_block(join);
......
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// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
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// (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 cases = [
[0.0, 0.0, 0.0, 0,0],
[undefined, 0.0, NaN, NaN],
[0.0, undefined, NaN, NaN],
[NaN, 0.0, NaN, NaN],
[0.0, NaN, NaN, NaN],
[-NaN, 0.0, NaN, NaN],
[0.0, -NaN, NaN, NaN],
[Infinity, 0.0, Infinity, 0.0],
[0.0, Infinity, Infinity, 0.0],
[-Infinity, 0.0, 0.0, -Infinity],
[0.0, -Infinity, 0.0, -Infinity]
];
function do_min(a, b) {
return Math.min(a, b);
}
function do_max(a, b) {
return Math.max(a, b);
}
// Make sure that non-crankshaft results match expectations.
for (i = 0; i < cases.length; ++i) {
var c = cases[i];
assertEquals(c[3], do_min(c[0], c[1]));
assertEquals(c[2], do_max(c[0], c[1]));
}
// Make sure that crankshaft results match expectations.
for (i = 0; i < cases.length; ++i) {
var c = cases[i];
%OptimizeFunctionOnNextCall(do_min);
%OptimizeFunctionOnNextCall(do_max);
assertEquals(c[3], do_min(c[0], c[1]));
assertEquals(c[2], do_max(c[0], c[1]));
}
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