[Bug rtl-optimization/19780] Floating point computation far slower for -mfpmath=sse

[ubizjak at gmail dot com]

------- Comment #21 from ubizjak at gmail dot com  2007-04-06 07:37 -------
Strange things happen.

I have fully removed gcc build directory and bootstrapped gcc from scratch. To
my suprise, the difference with -msse and without -msse is now gone and
optimized dumps are now the same. For reference, the compiler has ident "gcc
version 4.3.0 20070406 (experimental)".

Regarding this bug - SSE performance vs x87 performance is clearly target
procesor dependant. There is nothing gcc can do, and even without memory acces,
SSE is slower than x87 on some targets (ref: Comment #5).

Let's close this bug as WONTFIX, as there is nothing to fix in gcc.


-- 

ubizjak at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19780