Convert constant numbers at compile time.

Convert constant numbers at compile time.

TEST=mjsunit/number-tostring
R=mvstanton@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=17917

[Benedikt Meurer, 2013-11-20 10:36:38]

Hey Michael,
Here's the next constant optimization. PTAL
-- Benedikt

[mvstanton, 2013-11-20 11:49:39]

One question for ya below.

https://codereview.chromium.org/77553005/diff/1/src/hydrogen.cc
File src/hydrogen.cc (right):

https://codereview.chromium.org/77553005/diff/1/src/hydrogen.cc#newcode1545
src/hydrogen.cc:1545: if (object->IsConstant()) {
I think just checking if object is constant isn't strong enough without a check
that the type is Number, right?

[Benedikt Meurer, 2013-11-20 11:56:45]

https://codereview.chromium.org/77553005/diff/1/src/hydrogen.cc
File src/hydrogen.cc (right):

https://codereview.chromium.org/77553005/diff/1/src/hydrogen.cc#newcode1545
src/hydrogen.cc:1545: if (object->IsConstant()) {
On 2013/11/20 11:49:40, mvstanton wrote:
> I think just checking if object is constant isn't strong enough without a
check
> that the type is Number, right?

Done.

[mvstanton, 2013-11-20 12:27:46]

lgtm

[Benedikt Meurer, 2013-11-20 12:35:32]

Committed patchset #2 manually as r17917.