r205436 - Extend the SSE2 comment lexing to AVX2. Only 16byte align when not on AVX2.

[Eric Christopher]

On Wed, Apr 2, 2014 at 12:14 PM, Chris Lattner <clattner at apple.com> wrote:
>
> On Apr 2, 2014, at 12:14 PM, Chris Lattner <clattner at apple.com> wrote:
>
>>
>> On Apr 2, 2014, at 10:27 AM, Roman Divacky <rdivacky at freebsd.org> wrote:
>>
>>> Author: rdivacky
>>> Date: Wed Apr  2 12:27:03 2014
>>> New Revision: 205436
>>>
>>> URL: http://llvm.org/viewvc/llvm-project?rev=205436&view=rev
>>> Log:
>>> Extend the SSE2 comment lexing to AVX2. Only 16byte align when not on AVX2.
>>>
>>> This provides some 3% speedup when preprocessing gcc.c as a single file.
>>
>> Nice!
>>
>
> I haven't looked closely at them, but would any of the SSE 4.2 "string processing" instructions be helpful here?
>

IIRC Danny has a patch that does this :)

-eric