REGRESSION(r201363): "40% regression on date-format-xparb" (Requested by keith_miller on #webkit).

[WebKit Commit Bot]

http://trac.webkit.org/changeset/201363 broke the build:
"40% regression on date-format-xparb" (Requested by keith_miller on #webkit).

This is an automatic bug report generated by webkitbot. If this bug
report was created because of a flaky test, please file a bug for the flaky
test (if we don't already have one on file) and dup this bug against that bug
so that we can track how often these flaky tests fail.

[WebKit Commit Bot]

Created attachment 280189 [details]
ROLLOUT of r201363

Any committer can land this patch automatically by marking it commit-queue+.  The commit-queue will build and test the patch before landing to ensure that the rollout will be successful.  This process takes approximately 15 minutes.

If you would like to land the rollout faster, you can use the following command:

  webkit-patch land-attachment ATTACHMENT_ID

where ATTACHMENT_ID is the ID of this attachment.

[WebKit Commit Bot]

Comment on attachment 280189 [details]
ROLLOUT of r201363

Clearing flags on attachment: 280189

Committed r201532: <http://trac.webkit.org/changeset/201532>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Keith Miller]

Reopening to attach new patch.

[Keith Miller]

Created attachment 280362 [details]
Patch for landing

[Keith Miller]

Created attachment 280365 [details]
benchmark-results

These results were taken against the pre-rollout build.

The ! for Int16Array-bubble-sort-with-byteLength.js in the benchmark report is noise.

The other !s for string-concat-object.js, string-concat-pair-object.js, and string-cons-tower.js. As well as the non-progression for date-format-xparb.js were due to a small bug and subsequent runs produced the following results:

SunSpider:
   date-format-tofte        6.0138+-0.4548     ?      6.2283+-0.3057        ? might be 1.0357x slower
   date-format-xparb        6.9422+-0.0539     ^      4.3854+-0.1459        ^ definitely 1.5830x faster

   <arithmetic>             6.4780+-0.2355     ^      5.3069+-0.1284        ^ definitely 1.2207x faster

                                Conf#1                    Conf#2
LongSpider:
   date-format-tofte      483.6457+-8.5849          481.0978+-12.1114
   date-format-xparb     1287.4682+-10.3507    ^    585.5452+-6.1688        ^ definitely 2.1988x faster

   <geometric>            789.0906+-8.3229     ^    530.7351+-4.6472        ^ definitely 1.4868x faster


string-concat-object             1.7230+-0.1710            1.6878+-0.0833          might be 1.0208x faster
string-concat-pair-object        1.6404+-0.0516     ?      1.7815+-0.1776        ? might be 1.0860x slower
string-concat-pair-simple        2.6100+-0.1266            2.5430+-0.0564          might be 1.0264x faster
string-concat-simple             8.2468+-0.5875     ?      8.4598+-1.0827        ? might be 1.0258x slower
string-cons-repeat               5.9652+-0.5156            5.7872+-0.4014          might be 1.0308x faster
string-cons-tower                5.9332+-0.1850     ?      6.1245+-0.6151        ? might be 1.0322x slower
substring-concat-weird          32.2861+-0.5575           31.8450+-0.4954          might be 1.0139x faster
substring-concat                34.4919+-0.0828     ?     35.3392+-1.7407        ? might be 1.0246x slower

<geometric>                      6.2710+-0.2199     ?      6.3261+-0.1676        ? might be 1.0088x slower

[WebKit Commit Bot]

Comment on attachment 280362 [details]
Patch for landing

Clearing flags on attachment: 280362

Committed r201617: <http://trac.webkit.org/changeset/201617>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.