http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50037
--- Comment #8 from Ilya Enkovich <enkovich.gnu at gmail dot com> 2011-08-15
09:06:18 UTC ---
This patch did not work for me. Tried on following loop (-O2 -funroll-loops):
for ( count = ((*(hdrptr)) & 0x7); count > 0; count--, addr++ )
sum += *addr;
No multiplication by 2 but still have the same unroll.
I also was hoping this patch would prevent unroll of prologue loop generated by
vectorizer.It uses '& 7' expression for iterations computation but this loop
also uses MIN expression to limit number of iteration and is still unrolled.
