On Fri, 2016-09-23 at 14:07 +0000, Wilco Dijkstra wrote: > After discussion (https://gcc.gnu.org/ml/gcc-patches/2016-09/msg00718 > .html) > here is the latest version of the strchr patch. This uses a gimple > statement for > the pointer addition so the gsi_prev always points at the strlen > call. > > Optimize strchr (s, 0) to s + strlen (s). strchr (s, 0) appears a > common > idiom for finding the end of a string, however it is not a very > efficient > way of doing so. Strlen is a much simpler operation which is > significantly > faster (eg. on x86 strlen is 50% faster for strings of 8 bytes and > about > twice as fast as strchr on strings of 1KB). > > OK for commit?
Please add PR tree-optimization/61056 to the changelog so that it gets linked in bugzilla. Cheers, Oleg
