1.what's the meaning of ALTERNATE_JSIMMEDIATE and slow case?
2.how come the following code can use ECX as base register?
load32(Address(X86::ecx, FIELD_OFFSET(Structure, m_typeInfo.m_flags)),
X86::ecx);
if the X86::ecx just means its value 1 in ModR/M, does it means [BX+DI]?
3. can anybody help me on my previous questions? does JIT support floating
point?
many thanks
joe
--- On Tue, 2/3/09, x yz last...@yahoo.com wrote:
From: x yz last...@yahoo.com
Subject: Re: [webkit-dev] want to port JIT to MIPS - IEEE ques
To: Gavin Barraclough barraclo...@apple.com, WebKit Development
webkit-dev@lists.webkit.org
Date: Tuesday, February 3, 2009, 9:08 AM
1. Thanks for more info. Although X86 Linux gcc uses
regparam(3), I think MIPS ABI always asks $a0~a3/@v0~v1 for
i/o?
2. It seems I can get rid of 64bit OP if
JIT_OPTIMIZE_ARITHMETIC and
ALTERNATE_JSIMMEDIATE are both disabled?
3. is it ALTERNATE_JSIMMEDIATE for ecma-262?
4. does JIT support floating point? if yes why it is not
under jit/asm?
rgds
joe
--- On Wed, 1/28/09, Gavin Barraclough
barraclo...@apple.com wrote:
From: Gavin Barraclough barraclo...@apple.com
Subject: Re: [webkit-dev] want to port JIT to MIPS,
any coworker or any hint?
To: last...@yahoo.com
Date: Wednesday, January 28, 2009, 4:55 PM
On Jan 27, 2009, at 10:58 PM, x yz wrote:
Gavin,
last night I saw WREC when I search X86, and
realized
many places
need to be touched. Your reply give more info and
really help.
Thanks a lot.
In Generator::generateEnter(), there is comment
On gcc the function
is regparm(3)..., how to understand that?
WREC JIT generates a function with a C calling
convention
that
implements the regular expression. The entry and exit
from
the
function are generated by the generateEnter() and
generateReturn*()
methods. On OS X x86, the JIT generated function
implements a
regparm(3) calling convention (see WREC.h, the
generated
code is
called through a CompiledRegExp function pointer).
The function has no argument, why we peek four
arguments from
stack(input,output,length,index)?
These calls are not peeking values from the stack at
the
time they are
called; they are emitting JIT code that will will read
values from the
stack, when the JIT function has been generated and is
run.
The JIT
generated regular expression function is passed these
four
arguments
(again see WREC.h).
As a note, you're best directing these emails at
the
webkit-dev list
in future, that way other people will also be able to
help
you out.
cheers,
G.
rgds
joe
--- On Tue, 1/27/09, Gavin Barraclough
barraclo...@apple.com wrote:
From: Gavin Barraclough
barraclo...@apple.com
Subject: Re: [webkit-dev] want to port JIT to
MIPS, any coworker or
any hint?
To: last...@yahoo.com
Date: Tuesday, January 27, 2009, 5:10 AM
On Jan 26, 2009, at 11:09 AM, x yz wrote:
Gavin,
Thanks, I really need to learn fast.
Where can I find more on WREC or its
spec?
WREC is WebKit's regular expression JIT.
The
spec it
is implementing is the regular expression
syntax
described
in ECMA-262.
Which part of webkit is WREC? I just see
all
assembler
codes are in assembler and
jit and
wonder
whether I can just change them rather then
change
WREC.
WebKit contains two separate JITs, one for
the
JavaScript
language (in the 'jit' directory),
one for
JavaScript's regular expression language
(in
the
'wrec' directory). Both JITs make
use of
the same
assembler to emit code. WREC is a much
smaller,
simpler
JIT, which is why I suggest starting by
looking at
this, but
either JIT can be enabled independently of
the
other.
Foresee SSE set may be a problem as MIPS
has
no SSE.
WREC does not use SSE, and I believe all JIT
code
generated
by the main JS JIT is guarded by the a
configuration switch,
JIT_OPTIMIZE_ARITHMETIC – this can be
disabled
in
Platform.h.
Sun's link for The JIT Compiler
Interface
Specification not valid anymore.
Our JIT is all our own code, and written from
scratch, so
I'm not sure this documentation would
help
you.
Good luck,
G.
MacroAssembler::breakpoint() is just int3
which I know
used as debug int in X86. I'll see which
one
used in gnu
mips.
joe
--- On Sun, 1/25/09, Gavin Barraclough
barraclo...@apple.com wrote:
From: Gavin Barraclough
barraclo...@apple.com
Subject: Re: [webkit-dev] want to
port JIT
to
MIPS, any coworker or any hint?
To: WebKit Development
webkit-dev@lists.webkit.org
Date: Sunday, January 25, 2009, 5:34
PM
On Jan 24, 2009, at 8:36 PM, x yz
wrote:
Just build webkit on XP using
cgywin,
not
tested yet.
I want to port to 32bit MIPS, it
seems I
need to
