------- Comment #4 from paolo dot bonzini at lu dot unisi dot ch 2007-06-19 05:09 ------- Subject: Re: tree-ssa-math-opts.c performs too many IL scans
> We have reciprocal pass (in fact CSE recip pass) that CSEs 1.0/z from x/z, > y/z, > .../z. This is done by scanning function for RDIV_EXPR, where denominator (z) > is the same. If 1.0/func() -> rfunc() conversion is done before recip pass, we > loose the ability to scan for RDIV_EXPRs and the ability to CSE the division. You could still use a pointer_set or pointer_map to save where the RDIV_EXPRs are and avoid scanning the IL twice. Paolo -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32390
