URL:
<http://savannah.gnu.org/bugs/?30821>
Summary: Support new SSE 4.2 string searching instructions?
Project: grep
Submitted by: mackstann
Submitted on: Thu 19 Aug 2010 05:17:51 PM GMT
Category: None
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
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Details:
Here is an implementation of strstr using these new instructions:
<http://www.strchr.com/strcmp_and_strlen_using_sse_4.2> (you actually might
not actually want to read the code if you plan on implementing this, as it
does not appear to be made available under a free license)
It could possibly provide a performance boost in i3/i5/i7 and subsequent
CPUs. Right now that might limit its usefulness, but after a few years I'm
sure SSE 4.2 support should be a lot more widespread.
The Boyer-Moore and other algorithms(?) grep uses might end up being faster
anyway, so this would definitely be an experiment. I also don't know if GNU
or the grep maintainers have philosophical problems with implementing
CPU-specific assembly code like these, but I figured it was at least worth
mentioning.
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