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Author SHA1 Message Date
olivf@chromium.org
7873f35eb2 Hydrogenisation of binops 
BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/24072013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17052 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-10-01 15:24:56 +00:00
svenpanne@chromium.org
bc6fe88030 Desugar bitwise negation into XOR and kill all UnaryOp stuff. 
R=mstarzinger@chromium.org, verwaest@chromium.org

Review URL: https://codereview.chromium.org/22184004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16073 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-08-06 13:34:51 +00:00
verwaest@chromium.org
a9fd01d567 - Makes a common superclass for Load and Store stub compiler. 
- Splits all non-normal Store ICs into handler and IC.
- Ensures monomorphic store ICs go polymorphic.
- Feeds polymorphic type feedback into count operation.

R=ulan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/14142005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15566 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-09 08:22:41 +00:00
rossberg@chromium.org
437f8b0c24 Unrevert "Remove BinaryOp::result_type"" 
Reenables https://code.google.com/p/v8/source/detail?r=15265

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/18309005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15505 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-05 08:49:37 +00:00
rossberg@chromium.org
731a2aba34 Revert "Remove BinaryOp::result_type" 
This reverts https://code.google.com/p/v8/source/detail?r=15265, due to performance regression.

TBR=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/18525002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15444 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-02 11:57:43 +00:00
rossberg@chromium.org
04e1278529 Remove BinaryOp::result_type 
R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17261023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15265 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-21 12:16:14 +00:00
rossberg@chromium.org
0977c60984 Use AST's type field and merge types for unary, binary & compare ICs 
R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17468003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15264 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-21 11:10:06 +00:00
verwaest@chromium.org
b17e759dc1 Add soft-deopt for uninitialized assignment 
R=hpayer@google.com

Review URL: https://chromiumcodereview.appspot.com/17071002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15241 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-20 13:09:43 +00:00
jkummerow@chromium.org
47ba2b2dd8 Migrate BinaryOpICs and UnaryOpICs to new type rep 
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/16957004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15172 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-14 17:02:39 +00:00
rossberg@chromium.org
94f651bc1b Migrate Compare ICs to new type rep 
(Does not yet use common AST expression type field.)

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16361015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15093 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 17:20:37 +00:00
danno@chromium.org
1b89cbf817 Separate Cell and PropertyCell spaces 
This makes it possible to store additional information on property cells, for example Type and optimized Code dependencies.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/16631002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15089 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 15:03:44 +00:00
mvstanton@chromium.org
1fc6065b38 CallNewArray sites need the original feedback cell at crankshaft time. 
This CL addresses a TODO in the hydrogen-based array constructor code,
to pass through the actual type feedback cell, rather than the contents
of the cell.

BUG=
R=danno@chromium.org

Review URL: https://codereview.chromium.org/16408005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15004 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-07 13:21:20 +00:00
svenpanne@chromium.org
b9e025a8dc Collect type feedback for power-of-2 right operands in BinaryOps. 
Improved --trace-ic output for unary/binary ops a bit on the way. Moved int32_t/uint32_t conversion helpers around.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/15735005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14928 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-04 07:49:45 +00:00
rossberg@chromium.org
6fda4e4c28 Collect type feedback in separate pass and store it in AST 
Notes:

- For now, just adds the missing type info fields to the AST nodes directly.
  I'd like to factor that out more nicely in a follow-up CL.

- All type feedback now is uniformly collected through AST nodes'
  RecordTypeFeedback functions. At some point, this logic should be moved
  out of ast.cc.

- The typing pass currently simulates the exact same conditions under
  which feedback was collected in Hydrogen before. That also should be
  made more generic in the future.

- Type information itself is unchanged. Making it more regular is
  yet more future work.

Some additional cleanups:

- Lifted out nested class ObjectLiteral::Property, to enable forward declaration.
- Moved around some auxiliary enums.

R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/14990014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14825 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-05-27 13:59:20 +00:00
danno@chromium.org
f8ddf3a262 Add monomorphic CompareNilICs and Crankshaft support 
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/14367018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14407 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-04-24 11:32:17 +00:00
svenpanne@chromium.org
e02315ef77 Added an Isolate parameter to some HashTable/Dictionary methods. TypeFeedbackOracle tweaks. 
BUG=v8:2487

Review URL: https://codereview.chromium.org/12764003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13908 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-03-12 07:06:36 +00:00
danno@chromium.org
bbc599f334 Unify grow mode and stub kind 
In the process, ensure that transition-causing element stores handle all cases of the transitioned receiver map.

Review URL: https://codereview.chromium.org/12390031

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13850 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-03-06 21:51:07 +00:00
verwaest@chromium.org
590a3f8811 Polymorphism support for load IC. 
Review URL: https://chromiumcodereview.appspot.com/12340112

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13801 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-03-04 14:03:27 +00:00
mvstanton@chromium.org
c4caf766bf Allocation Info Tracking, continued. 
Addresses missing cases for array literals.
Adds support for "new Array()" call sites. This isn't complete yet, I have to run with --noinline_new.

BUG=

Review URL: https://codereview.chromium.org/11818021

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13790 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-03-01 16:06:34 +00:00
rossberg@chromium.org
55f93b5532 Renamed "symbols" to "internalized strings" throughout the code base, 
in preparation of the introduction of ES6 'symbols' (aka private/unique names).

The SymbolTable became the StringTable. I also made sure to adapt all comments. The only remaining use of the term "symbol" (other than unrelated uses in the parser and such) is now 'NewSymbol' in the API and the 'V8.KeyedLoadGenericSymbol' counter, changing which might break embedders.

The one functional change in this CL is that I removed the former 'empty_string' constant, since it is redundant given the 'empty_symbol' constant that we also had (and both were used inconsistently).

R=yangguo@chromium.org
BUG=

Review URL: https://codereview.chromium.org/12210083

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13781 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-02-28 17:03:34 +00:00
verwaest@chromium.org
c3d45451f0 Replace special IC builtins and stubs in the map's cache by codestubs. 
Review URL: https://chromiumcodereview.appspot.com/11973008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13453 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-01-21 14:53:29 +00:00
verwaest@chromium.org
c386538cd2 Use POLYMORPHIC for polymorphic Keyed(Load|Store)IC 
Review URL: https://chromiumcodereview.appspot.com/11794045

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13332 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-01-08 12:01:51 +00:00
jkummerow@chromium.org
1c086d1202 Lattice-based representation inference, powered by left/right specific type feedback for BinaryOps and comparisons 
Review URL: https://chromiumcodereview.appspot.com/10837165

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12961 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-11-14 15:59:45 +00:00
rossberg@chromium.org
42552808ab Rename "global context" to "native context", 
in anticipation of the upcoming lexical global scope.

Mostly automatised as:

for FILE in `egrep -ril "global[ _]?context" src test/cctest`
do
  echo $FILE
  sed "s/Global context/Native context/g" <$FILE >$FILE.0
  sed "s/global context/native context/g" <$FILE.0 >$FILE.1
  sed "s/global_context/native_context/g" <$FILE.1 >$FILE.2
  sed "s/GLOBAL_CONTEXT/NATIVE_CONTEXT/g" <$FILE.2 >$FILE.3
  sed "s/GlobalContext/NativeContext/g" <$FILE.3 >$FILE
  rm $FILE.[0-9]
done

R=mstarzinger@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10832342

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12325 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-08-17 09:03:08 +00:00
svenpanne@chromium.org
b5da7279b1 Introduced TypeFeedbackId and BailoutId types. 
This is a refactoring-only CL which improves the typing of IDs associated with
AST nodes. The interesting parts are in utils.h and ast.h, the rest of the CL
basically follows mechanically.

Review URL: https://chromiumcodereview.appspot.com/10831172

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12263 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-08-06 14:13:09 +00:00
sanjoy@chromium.org
3ec32fd311 Introduce an OptimizingCompiler class, responsible for maintaining the state needed to run Crankshaft. 
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10700188

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12112 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-07-17 16:24:40 +00:00
sanjoy@chromium.org
6125718f37 Remove TLS access for current Zone. 
By passing around a Zone object explicitly we no longer need to do a
TLS access at the sites that allocate memory from the current Zone.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10534006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11761 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-06-11 12:42:31 +00:00
fschneider@chromium.org
e081a3bfba Insert explicit deoptimization for named loads that have "uninitialized" type feedback. 
We already do this for binary-ops, unary-ops and comparisons. Typefeedback for named loads can now also
be in "uninitialized" state which means that the corresponding load IC was never executed.
Review URL: https://chromiumcodereview.appspot.com/9722041

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11087 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-19 15:54:37 +00:00
mstarzinger@chromium.org
0ab3fb8b00 Implement non-generic stores for object literals. 
This uses the type feedback already present for computed value stores
into object literals to generate optimized stores in Crankshaft, thus
avoiding unnecessary generic stores with side effects.

R=svenpanne@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9692036

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11023 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-13 12:11:46 +00:00
vegorov@chromium.org
ff6ebf7dff Introduce basic type feedback for for-in statements to avoid deopts. 
R=fschneider@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9571001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10901 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-02 11:33:33 +00:00
mstarzinger@chromium.org
fb8eb04bfd Implement inlining of constructor calls. 
R=vegorov@chromium.org,kmillikin@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9304001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10849 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-28 09:05:55 +00:00
mstarzinger@chromium.org
8c12b6b743 Implement target cache for constructor calls. 
This caches call targets of constructor calls by associating one element
caches with call sites. The type feedback oracle can use the recorded
valued to gather type information for monomorphic constructor call sites.

R=kmillikin@chromium.org,vegorov@chromium.org

Review URL: https://chromiumcodereview.appspot.com/8932004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10531 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-27 13:03:19 +00:00
kmillikin@chromium.org
cb876c25a4 Include what you use for allocation, api, assembler, and ast. 
R=fschneider@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9288011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10505 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-25 16:31:25 +00:00
erik.corry@gmail.com
40a433c9e0 Split NumberDictionary into a randomly seeded and an unseeded 
version. We don't want to randomize the stub cache.
Review URL: http://codereview.chromium.org/9174023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10402 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-16 09:44:35 +00:00
fschneider@chromium.org
b6b4af9d89 Filter out maps from different global context when collecting type feedback. 
This avoid leaking memory because optimized code may hold on to maps
from different tabs otherwise.

BUG=v8:1823, 102895
Review URL: http://codereview.chromium.org/8892002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10257 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-12-14 14:01:54 +00:00
ricow@chromium.org
ec66c36fbf Reland 10216 - Optimize the equality check case of ICCompare stubs. 
Now with arm and x64 support. Additionally, added default unreachable case to switch statement in CompareIC::TargetState to make win and mac compilers happy.

Reviewer guide:
This is an exact copy of 10216 except:
src/arm/*
src/x64/*
src/ic.cc (added default case to swith in CompareIC::TargetState)
Review URL: http://codereview.chromium.org/8872060

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10219 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-12-09 09:26:14 +00:00
ricow@chromium.org
174532d23f Revert 10216 Optimize the equality check case of ICCompare stubs. 
Missing arm and x64 implementations
Review URL: http://codereview.chromium.org/8883023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10217 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-12-08 17:28:44 +00:00
ricow@chromium.org
1028cf2631 Optimize the equality check case of ICCompare stubs. 
This includes specialcasing the generation when we know that the maps
of the two objects are the same. In addition, a new specialized
compare ic known objects cache is created.

The reason for the cache is that we need to have access to the stub
code from the roots; if we do not, the GC will collect the stub. In
this specialized case we use the map pointer as key in the cache, and
we always do a lookup before generating code. Actually hitting
something in the cache will happen very rarely, but we could
potentially overwrite an existing stub, which again will lead to the
GC collecting this old stub (even if it is referenced from other code
objects)
Review URL: http://codereview.chromium.org/8520006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10216 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-12-08 17:17:21 +00:00
fschneider@chromium.org
8fbf1d5017 Landing: [hydrogen] optimize switch with string clauses. Patch by Fedor Indutny <fedor.indutny@gmail.com>. 
Original code review: http://codereview.chromium.org/8373029/
Review URL: http://codereview.chromium.org/8589019

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10019 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-17 13:57:55 +00:00
fschneider@chromium.org
4627023b38 Revert r9901 to make tree green again. 
There was a test failure on x64 mozilla tests.

TBR=ricow@chromium.org
Review URL: http://codereview.chromium.org/8495011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9902 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 09:56:09 +00:00
fschneider@chromium.org
cac3008437 [hydrogen] optimize switch with string clauses 
Hydrogen should optimize not only SMI clauses, but clauses with string literals
too.

Patch from fedor.indutny <fedor.indutny@gmail.com>.

R=vegorov@chromium.org
BUG=
TEST=
Review URL: http://codereview.chromium.org/8373029

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9901 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 09:08:33 +00:00
fschneider@chromium.org
53e7502fa0 Fix bug in environment simulation after inlined call-as-function. 
This change is based on my previous change enabling inlining calls-as-function
fixing the bugs related to deoptimization.

The function value on top of the environment was dropped too late in the old code.
As a result we could get a wrong value on top after deoptimization.

This change includes r9619. It was reverted because of test failures that are fixed
with this patch.
Review URL: http://codereview.chromium.org/8360001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9758 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-10-24 13:53:08 +00:00
fschneider@chromium.org
948a323819 Revert r9619. 
It causes an assertion with deoptimizing from inlined code.
Review URL: http://codereview.chromium.org/8277034

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9636 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-10-14 12:26:29 +00:00
fschneider@chromium.org
c68fc4126f Revert last revert. 
TBR=whesse@chromium.org
Review URL: http://codereview.chromium.org/8286023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9635 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-10-14 12:03:53 +00:00
fschneider@chromium.org
85ab75df50 Revert r9619. 
TBR=whesse@chromium.org
Review URL: http://codereview.chromium.org/8286022

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9633 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-10-14 11:56:07 +00:00
fschneider@chromium.org
34534588fb Fix a number of bugs with inlining calls as function. 
1. Record AST id for CallFunctionStub.

2. Correctly extract cached target from CallFunctionStub inline cache.

3. Fix a bug when inling call as a function in effect or value context:
   Handle abnormal exits correcty.

4. Fix a bug when inlining call as a function in test context: drop function
   correctly from true and false block.

5. Avoid inlining mutually recursive functions by checking the stack of function
   states before inlining. This was not a bug, but is just a more general
   check to avoid recursive inlining.
Review URL: http://codereview.chromium.org/8258012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9619 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-10-14 08:43:27 +00:00
fschneider@chromium.org
313f9505b4 Make accessors for oddball objects return Oddball* instead of Object*. 
Fix a use of the hole value and the undefined value before initialization when
initializing V8. Before we just read a NULL value from them.
Review URL: http://codereview.chromium.org/8130002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9557 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-10-10 09:21:48 +00:00
kmillikin@chromium.org
bcb781d76a Record function call targets, use them for inlining. 
Introduce a version of the CallFunctionStub that records monomorphic
call targets in a one-element cache in the instruction stream.  Use
the cache for inlining attempts in the optimizing backend.

R=fschneider@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/7966038

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9449 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-09-27 11:42:02 +00:00
vitalyr@chromium.org
633e615b89 Improve memory usage of receiver type feedback. 
Some AST nodes (Property, Call, etc.) store either a list of receiver
types or a monomorphic receiver type. This patch merges the two fields
using a small pointer list. GetMonomorphicReceiverType() is now a
purely convenience function returning the first and only recorded
type.

This saves about 500K (of about 39M) on average when compiling V8
benchmark as measured by a simple patch adding a zone allocation
counter (https://gist.github.com/1149397).

R=kmillikin@chromium.org

Review URL: http://codereview.chromium.org/7655017

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8993 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-08-22 14:23:37 +00:00
svenpanne@chromium.org
8ebf3993d6 Record ToBoolean's type information in Hydrogen's HBranch instruction, so we can use it in LCodeGen::DoBranch later. 
Review URL: http://codereview.chromium.org/7491043

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8736 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-07-25 14:08:36 +00:00