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[Bug optimization/14042] C++ abstraction penalty is high in simple cases
- From: "dberlin at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 20 Feb 2004 02:54:08 -0000
- Subject: [Bug optimization/14042] C++ abstraction penalty is high in simple cases
- References: <20040206074537.14042.tjw@omnigroup.com>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From dberlin at gcc dot gnu dot org 2004-02-20 02:54 -------
tree-ssa has one memcpy call on the C version,
The whole inner loop looks like:
L7:
vmaddfp v13,v11,v1,v12
vsubfp v0,v11,v12
vaddfp v1,v1,v12
vaddfp v11,v13,v0
vsubfp v12,v1,v0
vmaddfp v1,v1,v13,v0
bdnz L7
L6:
IE best it can do.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14042