MIPS: Improve runtime detection and compatibility wrt arch. revisions.

MIPS: Improve runtime detection and compatibility wrt arch. revisions.

TEST=
BUG=
R=jkummerow@chromium.org, paul.lind@imgtec.com

Committed: https://code.google.com/p/v8/source/detail?r=24486

[dusmil.imgtec, 2014-10-02 15:57:17]

dusan.milosavljevic@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, balazs.kilvady@imgtec.com, danno@chromium.org,
gergely.kis@imgtec.com, jkummerow@chromium.org, paul.lind@imgtec.com

[dusmil.imgtec, 2014-10-02 15:57:17]

PTAL.

[paul.l..., 2014-10-02 16:26:47]

LGTM, but this one needs v8 team review as well.

https://codereview.chromium.org/618193005/diff/1/src/base/cpu.cc
File src/base/cpu.cc (right):

https://codereview.chromium.org/618193005/diff/1/src/base/cpu.cc#newcode165
src/base/cpu.cc:165: // Fail-back to the least common denominator which is
mips32 revision 1.
nit: this should probably be "fall-back"

[dusmil.imgtec, 2014-10-02 17:02:09]

https://codereview.chromium.org/618193005/diff/1/src/base/cpu.cc
File src/base/cpu.cc (right):

https://codereview.chromium.org/618193005/diff/1/src/base/cpu.cc#newcode165
src/base/cpu.cc:165: // Fail-back to the least common denominator which is
mips32 revision 1.
On 2014/10/02 16:26:47, paul.l... wrote:
> nit: this should probably be "fall-back"

Done.

[paul.l..., 2014-10-03 01:02:35]

There are some corner cases not covered here. Lets *not* commit this revision.
We can discuss in the issue tracker.

[paul.l..., 2014-10-08 16:48:18]

OK, with patchset 3, this LGTM. Can one of the v8 team members PTAL as well?

[Jakob Kummerow, 2014-10-09 09:17:20]

lgtm

[dusmil.imgtec, 2014-10-09 09:39:39]

Committed patchset #3 (id:40001) manually as 24486 (presubmit successful).