http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42333
--- Comment #54 from Kaveh Ghazi <ghazi at gcc dot gnu.org> 2011-02-06 16:43:38 UTC --- (In reply to comment #53) > I think we should fix this by patching in a new linkage name for the routine > in > question with darwin_patch_builtins and creating a forwarding stub from the > old > name to the new name that we link against. We could mix in _ieee into the new > name. If we compile with -fast-math we can call the old routine, no patch, > and > if one wants accuracy, the we call the new name. I believe GCC already does the "fast" method in some situations. See tree-complex.c:expand_complex_division(). It switches on flag_complex_method, the difference is that the operation is done inline rather than a libcall. I'm foget under what circumstances flag_complex_method triggers, but GCC may already do what you propose in some fashion. --Kaveh
