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Author SHA1 Message Date
yangguo@chromium.org
d0398c08ce Make serializer non-static. 
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/296853007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21430 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 09:36:20 +00:00
mvstanton@chromium.org
e443c89206 Customized support for feedback on calls to Array. 
Gather transition feedback on array calls, and inline the Array
function call when it makes sense.

R=danno@chromium.org

Review URL: https://codereview.chromium.org/279423005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21429 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 09:30:02 +00:00
jkummerow@chromium.org
0829572ee8 Revert "Rename target-specific binaries built for host." 
The Android build system support for gyp has been fixed to handle
target-dependent host binaries correctly without requiring them to
include the target architecture in the name. Remove the suffixes to make
referring to these targets simpler again.

This reverts r14209.

BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/236833004

Patch from Richard Coles <torne@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21428 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 09:04:24 +00:00
mstarzinger@chromium.org
38d30d781f Make v8::TryCatch able to consume natively thrown exceptions. 
R=yangguo@chromium.org, haraken@chromium.org
BUG=chromium:362388
TEST=cctest/test-api/TryCatchNative
LOG=N

Review URL: https://codereview.chromium.org/287133005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21427 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 08:46:01 +00:00
danno@chromium.org
def6cff3da Allow specifying base offset when constructing Keyed hydrogen instructions 
This is preparation for pending hydrogen stub work that needs to access memory using KeyedLoad/KeyedStore operations where the base offset used for the accesses are is the the default (e.g. the size of an FixedArray header for FixedArrays or zero for external arrays).

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/295913009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21426 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 08:37:50 +00:00
hpayer@chromium.org
628636fb83 Increase external allocation limit. 
BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/291653005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21425 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 08:37:20 +00:00
yangguo@chromium.org
8b785bd352 Remove usage of Locker/Unlocker where possible. 
This is possible because we removed DebuggerAgent.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/286903004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21424 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 08:11:10 +00:00
ulan@chromium.org
e56594f10a Fix Array.prototype.push and Array.prototype.unshift for read-only length. 
BUG=
R=mstarzinger@chromium.org, mvstanton@chromium.org

Review URL: https://codereview.chromium.org/279773002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21423 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 08:09:57 +00:00
yangguo@chromium.org
f01f0e6c42 Remove check for SAHF support in ia32. 
On ia32, SAHF is guaranteed. It's only necessary to probe for it on x64.

R=svenpanne@chromium.org
BUG=376087
LOG=N

Review URL: https://codereview.chromium.org/296133006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21422 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 08:04:17 +00:00
yangguo@chromium.org
6fd69c2476 Remove special debug ExternalReferences. 
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/296043002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21421 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 07:57:33 +00:00
bmeurer@chromium.org
7c30bba18a Don't replace initializing smi stores during store elimination. 
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/286903019

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21420 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 07:40:07 +00:00
yangguo@chromium.org
ab3afc5722 Reland "Prevent liveedit on or under generators with open activations" 
The change relative to the previous CL is a logic change in
DropActivationsInActiveThreadImpl.  The previous CL skipped the matcher
unless the frame was a JS frame; this was correct for
MultipleFunctionTarget but not for SingleFrameTarget.

I have not been able to reproduce the original failures on either
architecture (ia32 or x64; stack frame dropping is unsupported on other
architectures).

R=yangguo@chromium.org
LOG=N
TEST=mjsunit/harmony/generators-debug-liveedit.js
BUG=

Review URL: https://codereview.chromium.org/270283002

Patch from Andy Wingo <wingo@igalia.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21419 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 07:32:59 +00:00
alph@chromium.org
a7e816db28 Introduce a separate event for CodeDeopt 
The reuse of CodeCreateEvent for deopt events caused a CodeCreateEvent
fired twice for a code object. When the event was processed for the first
time it seized the no-fp-ranges from code object, so the second event
had no ranges info leaving code entry without them.
As a result when a cpu profile sample falls into the region it missed the
2nd stack frame.

LOG=N
BUG=
R=bmeurer@chromium.org, loislo@chromium.org

Review URL: https://codereview.chromium.org/290093005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21418 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 05:36:27 +00:00
bmeurer@chromium.org
6683b4b9dd Transitioning stores change maps. 
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/296953003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21417 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-22 05:33:37 +00:00
yangguo@chromium.org
d9736047b7 Implement Mirror object for Symbols. 
R=rossberg@chromium.org, yurys@chromium.org
BUG=v8:3290
LOG=Y

Review URL: https://codereview.chromium.org/297513006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21414 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 15:13:50 +00:00
yangguo@chromium.org
c1eff30f1f Move promises recorded for debugging to thread local data. 
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/296693005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21413 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 15:00:32 +00:00
hpayer@chromium.org
b06ad59622 Revert "Increase external allocation limit." 
BUG=

Review URL: https://codereview.chromium.org/292983010

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21412 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 12:58:06 +00:00
hpayer@chromium.org
95077490c6 Increase external allocation limit. 
BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/297663008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21411 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 12:43:05 +00:00
jkummerow@chromium.org
38cfd30b69 Reorder checks in Runtime_TypedArrayInitialize* 
All checks must be performed before any side effects, so we get atomic transactions

BUG=chromium:374443
LOG=n
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/298843003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21410 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 12:36:37 +00:00
adamk@chromium.org
ccf8b20443 Fix OrderedHashSet::Remove caller in debug-only code after r21408 
TBR=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/294473011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21409 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 12:31:31 +00:00
adamk@chromium.org
9f86a91e76 Teach OrderedHashSet::Remove to report whether it actually removed anything 
This avoids an unnecessary runtime call from Set.prototype.delete().

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/290733008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21408 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 12:16:47 +00:00
jochen@chromium.org
6d2a51965a Comment out not yet used flags from BUILD.gn 
gn started to complain about unused variables

BUG=none
R=dcarney@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/292263003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21405 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 11:57:33 +00:00
jarin@chromium.org
02f1a1b987 Revert "Fix Heap::IsHeapIterable." (again) 
This reverts commit r21397.

TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/299813002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21404 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 09:49:18 +00:00
adamk@chromium.org
fa55c02b11 Allow debugger to step into Map and Set forEach callbacks 
BUG=v8:3341
LOG=Y
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/293083005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21403 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 09:25:50 +00:00
jkummerow@chromium.org
d4d4d30204 Stop using urllib.urlretrieve() directly. 
Using urllib for SSL connections when behind a proxy is known to be
broken, so apply the same fix from depot_tools r149742 and use a wrapper
around urllib2 instead.

R=jkummerow@chromium.org
TEST=run test262 behind corporate proxy

Review URL: https://codereview.chromium.org/297663003

Patch from Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21402 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 09:25:05 +00:00
jkummerow@chromium.org
58661c150f Fix ArrayShift hydrogen support 
BUG=chromium:374838
LOG=y
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/299713003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21401 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 08:51:29 +00:00
adamk@chromium.org
50f5a79590 Use SameValueZero for Map and Set 
Instead of normalizing the keys we use SameValueZero for the actual
comparison.

BUG=v8:1622
LOG=Y
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/299703004

Patch from Erik Arvidsson <arv@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21400 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 08:47:02 +00:00
adamk@chromium.org
6717ac656a Array Iterator next should check for own property 
Since we are using private symbols for the internal slots we need to
check for a local property.

BUG=None
LOG=Y
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/268363011

Patch from Erik Arvidsson <arv@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21399 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 08:05:11 +00:00
marja@chromium.org
910050e6d9 Fix UnboundScript::GetScriptName and GetLineNumber. 
Probably broken since r19925 (mine).

R=dcarney@chromium.org
BUG=

Review URL: https://codereview.chromium.org/296043004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21398 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 07:32:32 +00:00
jarin@chromium.org
58a130da6e Reland "Fix Heap::IsHeapIterable." 
This relands r21388 (+ handlification of an offending function).

BUG=373283
LOG=N
R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/294903003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21397 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-21 06:44:38 +00:00
jkummerow@chromium.org
e66b179990 Disable ArrayShift hydrogen support 
BUG=chromium:374838
LOG=y
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/295983003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21392 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 17:12:18 +00:00
yangguo@chromium.org
7e1c789685 Remove unused thread locals from debugger. 
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/286903003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21391 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 15:20:02 +00:00
plind44@gmail.com
eabf06021c MIPS: Avoid flushing the icache unnecessarily when updating target addresses in code. 
Port r21380 (ef20a0a)

Original commit message:
This CL updates RelocInfo update operations and set_target_address_at to enable
skipping of the icache flush if it going to be batched up later.
Code::CopyFrom and Code::Relocate are modified to avoid individual icache
flushes since the whole code area will be flushed after the reloc info is
updated.

These changes reduce a regression when enabling the OOL constant pool on Arm,
since this change can cause MovT/MovW instructions for relocatable targets
if the constant pool is full.

Scores for Mandreel latency on a Nexus 5:
- OOL CP disabled: 3533
- OOL CP enabled, without this CL: 1825
- OOL CP enabled, with change: 3015

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/296723003

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21390 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 14:49:05 +00:00
adamk@chromium.org
70c3a714a1 ES6 Map/Set iterators/forEach improvements 
This changes how Map/Set interacts with its iterators. When the
underlying table is rehashed or cleared, we create a new table (like
before) but we add a reference from the old table to the new table. We
also add an array describing how to transition the iterator from the
old table to the new table.

When Next is called on the iterator it checks if there is a newer table
that it should transition to. If there is, it updates the index based
on the previously recorded changes and finally changes itself to point
at the new table.

With these changes Map/Set no longer keeps the iterators alive. Also,
as before, the iterators keep the underlying table(s) alive but not the
actual Map/Set.

BUG=v8:1793
LOG=Y
R=mstarzinger@chromium.org, rossberg@chromium.org

Review URL: https://codereview.chromium.org/289503002

Patch from Erik Arvidsson <arv@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21389 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 14:22:05 +00:00
jarin@chromium.org
014bf8b407 Revert "Fix Heap::IsHeapIterable." 
This reverts commit r21387.

TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/291193002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21388 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 14:03:38 +00:00
jarin@chromium.org
dd4c82bbb3 Fix Heap::IsHeapIterable. 
We only consider heap iterable if the new space is empty (in addition to the exisiting old space check).

The change also moves the iterability forcing + allocation prevention gadgets to HeapIterator so that it is impossible to miss them when iterating the heap.

R=hpayer@chromium.org
BUG=373283
LOG=N

Review URL: https://codereview.chromium.org/285693006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21387 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 13:19:21 +00:00
bmeurer@chromium.org
a7e19c1a43 Revert "Refactor transitioning stores." 
This reverts commit r21383 for breaking the Mozilla tests.

TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/292993003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21386 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 13:03:25 +00:00
marja@chromium.org
2fee5a16ee Parser: delay throwing errors. 
This makes Parser a bit more independent of Isolate during the recursive descent
phase. That is necessary for making it possible to run Parser on a non-main
thread in the future.

Proof of concept CL for the the "Parser independent of Isolate" work is here:
https://codereview.chromium.org/231073002/

BUG=
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/289373005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21385 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 12:22:04 +00:00
bmeurer@chromium.org
fd4da6bfe7 Get rid of HStoreNamedField::SkipWriteBarrier(). 
The write barrier elimination does the right thing now, so
we can get rid of this hack.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/296023002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21384 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 11:25:47 +00:00
bmeurer@chromium.org
b09989ec58 Refactor transitioning stores. 
There's actually no need to have the transition as part of the HStoreNamedField instruction. In fact, it is cleaner and faster to generate a separate HStoreNamedField for the transition map. This will also help to eliminate map stores with store elimination, as well as reduce register pressure for transitioning stores on ia32.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/295743002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21383 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 11:06:23 +00:00
ishell@chromium.org
2a62cce170 Reland "v8::TryCatch now works correctly with ASAN's UseAfterReturn mode enabled." 
BUG=chromium:369962
LOG=N
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/282783004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21382 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 10:13:46 +00:00
hpayer@chromium.org
2c6438bbfa Print promotion rate and semi-space copy rate in --trace-gc-nvp. 
BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/290133004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21381 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 09:53:18 +00:00
rmcilroy@chromium.org
63199d0bfe Avoid flushing the icache unnecessarily when updating target addresses in code. 
This CL updates RelocInfo update operations and set_target_address_at to enable
skipping of the icache flush if it going to be batched up later.
Code::CopyFrom and Code::Relocate are modified to avoid individual icache
flushes since the whole code area will be flushed after the reloc info is
updated.

These changes reduce a regression when enabling the OOL constant pool on Arm,
since this change can cause MovT/MovW instructions for relocatable targets
if the constant pool is full.

Scores for Mandreel latency on a Nexus 5:
 - OOL CP disabled: 3533
 - OOL CP enabled, without this CL: 1825
 - OOL CP enabled, with change: 3015

R=rodolph.perfetta@arm.com, ulan@chromium.org

Review URL: https://codereview.chromium.org/284153004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21380 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 09:21:45 +00:00
rossberg@chromium.org
9d9fa6af31 Tighten HAS_PRIVATE to own properties 
R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/290373002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21379 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 09:13:26 +00:00
yangguo@chromium.org
cf49b6e3ca Reland "Simplify debugger state." 
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/299653002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21378 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 08:52:42 +00:00
bmeurer@chromium.org
c8ad96d703 Use HType::NonPrimitive() for array backing store allocations. 
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/291153003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21377 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 08:42:10 +00:00
vegorov@chromium.org
38f2d25a84 Ensure that interruptor callback registered through API is called outside of ExecutionAccess lock. 
Such a coarse locking can cause a dead-lock when another thread is attempting to clear an interrupt while we are waiting in the interrupt callback.

Add test that verifies this API invariant.

BUG=chromium:374978
LOG=N
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/291123002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21376 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 08:24:51 +00:00
bmeurer@chromium.org
424877c773 Fix invalid condition in check elimination effects. 
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/292993002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21375 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-20 08:16:47 +00:00
hpayer@chromium.org
b2c9fcaa4c Add allocation sites to scratchpad only if a significant amount of mementos was found. 
BUG=
R=titzer@chromium.org

Review URL: https://codereview.chromium.org/284223007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21370 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-19 16:07:20 +00:00
plind44@gmail.com
13af2c0598 MIPS: Allow comparison in UINT32 mode. 
Port r21355 (932c5de)

Original commit message:
Shamelessly based on parts of https://codereview.chromium.org/288853003/. :-)

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/296453003

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21369 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-05-19 15:30:23 +00:00