https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64225
--- Comment #7 from ktkachov at gcc dot gnu.org --- (In reply to ktkachov from comment #6) > fold-const.c has a comment in the relevant case that says: > /* Canonicalize x*x as pow(x,2.0), which is expanded as x*x. */ I think this comment is misleading. In builtins.c the expand_builtin_mathfn_2 handles the expansion of pow and I don't see any code to expand pow (x, 2.0) as x * x. It tries to use the pow optab, so unless the backend explicitly expands the case in such a manner, it will not be converted to x*x. Is there some other place in the compiler that plays a role here?
