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[Bug rtl-optimization/19780] Floating point computation far slower for -mfpmath=sse
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 29 Sep 2005 04:06:54 -0000
- Subject: [Bug rtl-optimization/19780] Floating point computation far slower for -mfpmath=sse
- References: <20050203162419.19780.uros@kss-loka.si>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-09-29 04:06 -------
Oh, and this looks very related to two operand instructions issue.
PPC gives optimial code:
L2:
fmul f0,f6,f9
fmul f13,f7,f10
fmul f12,f8,f11
fmsub f29,f8,f10,f0
fmsub f30,f6,f11,f13
fmsub f31,f7,f9,f12
fmr f6,f10
fmr f7,f11
fmr f8,f9
fmr f10,f31
fmr f11,f29
fmr f9,f30
bdnz L2
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19780