[Bug tree-optimization/48092] associative property of builtins is not exploited on GIMPLE
vincenzo.innocente at cern dot ch
gcc-bugzilla@gcc.gnu.org
Thu Sep 8 10:14:00 GMT 2011
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48092
--- Comment #3 from vincenzo Innocente <vincenzo.innocente at cern dot ch> 2011-09-08 10:01:48 UTC ---
btw even in C with -Ofast
a*exp(x)*exp(y) (same for sqrt) is NOT optimized. compare
double exp0(double x, double y) {
return exp(x)*exp(y);
}
double exp1(double a, double x, double y) {
return a*exp(x)*exp(y);
}
double exp02(double a, double x, double y) {
return a*(exp(x)*exp(y));
}
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