Why do memcpy and memmove both exist? Why did C99 introduce restrict? Why does Fortran prohibit aliasing?
I have measured the benefits of restrict semantics w.r.t. vectorization many times in the past, enough that I did not bother to benchmark this specific case. Jeff On Wed, Nov 11, 2015 at 8:02 AM, Dave Goodell (dgoodell) <[email protected] > wrote: > On Nov 11, 2015, at 9:47 AM, Jeff Hammond <[email protected]> wrote: > > > Is there a reason why buf and result can't be restrict pointers? I see > zero value in enabling the case of aliased local buffers when the side > effects are (1) a const buffer is modified and (2) the potential code > optimization demonstrated in my pull request is disallowed (without > specializing the macro for the aliased and non-aliased cases, of course). > > Let's flip that around: do you have any empirical evidence that this API > design decision is actually affecting performance in a noticeable way? "I > would like it to look differently, and I *think* there's optimization > potential" is a weak argument. > > -Dave > > -- Jeff Hammond [email protected] http://jeffhammond.github.io/
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