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optimize mbrtowc 

this simple change, in my measurements, makes about a 7% performance
improvement. at first glance this change would seem like a
compiler-specific hack, since the modified code is not even used.
however, I suspect the reason is that I'm eliminating a second path
into the main body of the code, allowing the compiler more flexibility
to optimize the normal (hot) path into the main body. so even if it
weren't for the measurable (and quite notable) difference in
performance, I think the change makes sense.
This commit is contained in:
Rich Felker 2013-04-08 22:49:59 -04:00
parent 8f06ab0eb9
commit a49e038bab
1 changed files with 2 additions and 3 deletions
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5
src/multibyte/mbrtowc.c
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@ -22,9 +22,8 @@ size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate
c = *(unsigned *)st;
if (!s) {
s = (void *)"";
wc = (void *)&wc;
n = 1;
if (c) goto ilseq;
return 0;
} else if (!wc) wc = (void *)&wc;
if (!n) return -2;