[Bug tree-optimization/50374] Support vectorization of min/max location pattern

[vincenzo.innocente at cern dot ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50374

--- Comment #26 from vincenzo Innocente <vincenzo.innocente at cern dot ch> 2011-11-30 09:13:08 UTC ---
using a minimal configuration like
./configure --prefix=/something --enable-languages=c,c++ --disable-multilib
--disable-bootstrap --enable-lto -enable-gold=yes -disable-libitm
I manage to build with the patch

int lmin(float const * __restrict__ c, int N) {
  int k=0;
  for (int i=1; i!=N; ++i)
     k =  (c[k] > c[i]) ? i : k;
  return k;
}
indeed vectorizes (sse, not avx).
The amount of code emitted is quite large though, it will most probably worth
only in a long loop
with more instructions to vectorize: the effective speedup need to be properly
evaluated case by case