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[Bug target/14552] compiled trivial vector intrinsic code is inefficient
- From: "astrange at ithinksw dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 19 Mar 2008 19:39:07 -0000
- Subject: [Bug target/14552] compiled trivial vector intrinsic code is inefficient
- References: <bug-14552-4523@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #25 from astrange at ithinksw dot com 2008-03-19 19:39 -------
Actually the first generates-
subl $12, %esp
movq _w, %mm0
paddw %mm0, %mm0
movq %mm0, _w
movq _w, %mm0
movq %mm0, _dw
addl $12, %esp
ret
which is better than the code in the original report but still has a useless
store/reload.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14552