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Revert r4146. Add a special case in Math.round for a SMI result. Also change the imp...

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TBR=ager@chromium.org, 
Review URL: http://codereview.chromium.org/1042006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4156 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
fschneider@chromium.org 2010-03-17 09:58:28 +00:00
parent 3ca9367341
commit 38d6470fca
1 changed files with 4 additions and 13 deletions
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17
src/runtime.cc
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@ -5325,21 +5325,12 @@ static Object* Runtime_Math_round(Arguments args) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
Counters::math_round.Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
if (x > 0 && x < Smi::kMaxValue) {
return Smi::FromInt(static_cast<int>(x + 0.5));
}
if (signbit(x) && x >= -0.5) return Heap::minus_zero_value();
// if the magnitude is big enough, there's no place for fraction part. If we
// try to add 0.5 to this number, 1.0 will be added instead.
if (x >= 9007199254740991.0 || x <= -9007199254740991.0) {
return args[0];
}
return Heap::NumberFromDouble(floor(x + 0.5));
double integer = ceil(x);
if (integer - x > 0.5) { integer -= 1.0; }
return Heap::NumberFromDouble(integer);
}