[webkit-dev] Windows 32-bit support?

[Adrian Perez de Castro]

On Tue, 25 Jun 2019 10:42:04 -0500, Michael Catanzaro <mcatanzaro at igalia.com> wrote:
> It's great that you find our stable branches helpful, but keep in mind 
> those branches do not include Windows-specific fixes.
> 
> On Tue, Jun 25, 2019 at 9:53 AM, Arunprasad Rajkumar 
> <ararunprasad at gmail.com> wrote:
> > Right. Actually the problem is in 32-bit Windows platform. I see that 
> > the JIT support has been dropped some time ago, and CLOOP based 
> > backend seems to be unstable on 32-bit Windows. Any thoughts on that?
> 
> So I'm not an expert here, but I understand there are three ways you 
> can build JSC:
> 
> (1) -DENABLE_JIT=ON, -DENABLE_C_LOOP=OFF
> (2) -DENABLE_JIT=OFF, -DENABLE_C_LOOP=OFF (?)
> (3) -DENABLE_JIT=OFF, -DENABLE_C_LOOP=ON
> 
> (-DENABLE_JIT=ON and -DENABLE_C_LOOP=ON are incompatible.)
> 
> I believe that nowadays the only 32-bit platforms supported by JIT are 
> Linux, and there only for ARM and MIPS, not x86. So you're almost 
> certainly going to need to use -DENABLE_JIT=OFF. That eliminates option 
> (1).

JIT works on x86 as long as your CPU has support for SSE2 instructions.

> You say the cloop seems unstable for you, which is option (3). So 
> perhaps you should try option (2) if you haven't already. I'm not 
> actually sure if that works, because I'm not an expert, which is why I 
> added that (?) to it. But at least it couldn't hurt to try.

Option (2) would be using the LLint bytecode interpreter, without JIT.

In principle CLoop is expected to work “everywhere” because the interpreter
is generated C/C++ code, which gets then built by the same compiler used to
build all the rest of WebKit.

> Maybe the Windows port maintainers know more about the status of 32-bit 
> Windows support?

Cheers,
—Adrián
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