On 2015/01/23 at 08:58:54, weiliang.lin wrote:
On 2015/01/23 08:46:26, Benedikt Meurer wrote:
> > Well, we may need to introduce the AVX version instruction for legacy
SSE
> instruction.
>
> You mean that would solve the issue? What about code generated by MSVC?
This
> code will still use the SSE instructions.
Yes, at least for the JIT code.
I think MSVC generated either all vex version instruction if available or
all
legacy sse instruction.
Currently in V8, only part sse instruction supports vex version, which
supports non-destrutive operand.
The only issue for v8 is that the precompiled code in snapshot can only
use
the legacy version, but the JIT may be vex version or legacy version,
depending
on the target platform.
Sounds good if that helps to fix the problem. However for 4.1 we will just
disable AVX on older windows versions for now.
https://codereview.chromium.org/869133002/
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