Re: [ANNOUNCE] Git v2.19.0-rc0

On Wed, Aug 22, 2018 at 07:14:42AM -0400, Derrick Stolee wrote:

The other thing I was going to recommend (and I'll try to test this out
myself later) is to see if 'the_hash_algo->rawsz' is being treated as a
volatile variable, since it is being referenced through a pointer. Perhaps
storing the value locally and then casing on it would help?

I tried various sprinkling of "const" around the declarations to make it
clear that the values wouldn't change once we saw them. But I couldn't
detect any difference. At most I think that would let us hoist the "if"
out of the loop, but gcc still seems unwilling to expand the memcmp when
there are other branches.

I think if that's the thing we want to have happen, we really do need to
just write it out on that branch rather than saying "memcmp".

-Peff