On Sun, Apr 26, 2009 at 12:52:00PM -0400, Neal Becker wrote: > I saw this on gcc devel ML: > > ------------ > On Thu, 23 Apr 2009, David Ronis wrote: > > > >From the info pages it seems that the new optimizations, > > -floop-interchange, -floop-strip-mine, and -floop-block, are NOT turned > > on when -O3 is specified. Is this correct and if so, why aren't they? > > Because the behavior of -O3 must not depend on whether optional libraries > are linked into GCC, and we did not decide to make PPL and CLooG required > to build GCC, so -O3 cannot enable any optimizations using optional > libraries. > > Joseph S. Myers > joseph@xxxxxxxxxxxxxxxx > ------------- > > Does our gcc-4.4 have these optional libs? Yes, it does (though, I've patched it a little bit, so that cc1/cc1plus/f951 etc. aren't unconditionally linked against -lcloog -lppl -lppl_c -lm -lstdc++ -lgmpxx libs cloog/ppl depend on, but instead dlopens libcloog.so.0 when the graphite optimizations are used (-floop-block, -floop-interchange, -floop-strip-mine, -fgraphite-identity or -fgraphite)). Jakub -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
