[Bug middle-end/18902] Naive (default) complex division algorithm

["gdr at integrable-solutions dot net" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From gdr at integrable-solutions dot net  2004-12-09 16:03 -------
Subject: Re:  Naive (default) complex division algorithm

"joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org> writes:

| ------- Additional Comments From joseph at codesourcery dot com  2004-12-09 11:46 -------
| Subject: Re:  Naive (default) complex division algorithm
| 
| On Thu, 9 Dec 2004, pcarlini at suse dot de wrote:
| 
| > A naive idea: would make sense swithing from flag_complex_divide_method == 0
| > to flag_complex_divide_method == 1 basing on -ffast-math or other, finer grained,
| > floating point, switch?!?
| 
| I'd suggest naming the switch -fcx-limited-range (including in 
| -ffast-math).  With due warning in the documentation that even the better 
| algorithm currently implemented doesn't avoid all excess overflow.  Given 

I suppose you don't mean a warning each time that flag is used, but
rather a note in our documentation.

| that C99 does expect something better than the naive algorithm it might 
| still make sense to switch to the better algorithm we have as the default 
| (with this flag to control it, and in future hopefully the 
| CX_LIMITED_RANGE pragma) for C.

I strongly support the idea that the non-grammar school algorithm
should be the default.

-- Gaby


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18902