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[Bug c/36733] Wery interesting compilation way (if no -Ox option)
- From: "msnkipa at mail dot ru" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Jul 2008 21:57:05 -0000
- Subject: [Bug c/36733] Wery interesting compilation way (if no -Ox option)
- References: <bug-36733-16414@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from msnkipa at mail dot ru 2008-07-04 21:57 -------
I know it, but such part as
movapd -320(%rbp), %xmm0
movapd %xmm0, -128(%rbp)
movapd -304(%rbp), %xmm0
movapd %xmm0, -144(%rbp)
movapd -144(%rbp), %xmm1
movapd -128(%rbp), %xmm0
is VERY strange, there are 2! local variables and 7 memory operation. If you
store all local variables in stack, code mab be such
movapd -320(%rbp), %xmm0
movapd -304(%rbp), %xmm1
What code you think to be normal with 3 or 7 memory operations? For what you
make store/load ops for one variable twice?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36733