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[Bug target/27440] [4.0/4.1/4.2 regression] code quality regression due to ivopts
- From: "bangerth at dealii dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 13 Sep 2006 03:32:36 -0000
- Subject: [Bug target/27440] [4.0/4.1/4.2 regression] code quality regression due to ivopts
- References: <bug-27440-1008@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from bangerth at dealii dot org 2006-09-13 03:32 -------
With today's 4.1.x snapshot and on x86_64, I get this at -O2:
----------------
.L4:
mov %edx, %eax
incl %edx
cmpl %edx, %ecx
movl %esi, (%rdi,%rax,4)
jne .L4
----------------
and this at -O2 -fno-ivopts
----------------
.L4:
mov %edx, %eax
incl %edx
cmpl %ecx, %edx
movl %esi, (%rdi,%rax,4)
jb .L4
----------------
That means we get the same bad code there in both cases :-(
W.
--
bangerth at dealii dot org changed:
What |Removed |Added
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CC| |bangerth at dealii dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27440