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Re: optimization/8935: Failure to apply trivial peephole optimizations
- From: bangerth at dealii dot org
- To: gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, martin at xemacs dot org, nobody at gcc dot gnu dot org
- Date: 21 Dec 2002 04:51:01 -0000
- Subject: Re: optimization/8935: Failure to apply trivial peephole optimizations
- Reply-to: bangerth at dealii dot org, gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, martin at xemacs dot org, nobody at gcc dot gnu dot org, gcc-gnats at gcc dot gnu dot org
Synopsis: Failure to apply trivial peephole optimizations
State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Fri Dec 20 20:51:01 2002
State-Changed-Why:
Confirmed. With present CVS I get with -O3 -fomit-frame-pointer:
----------------
subl $44, %esp
xorl %eax, %eax
addl $44, %esp
ret
------------------
which is also not much more clever than what we get without
-fomit-frame-pointer with present CVS (first foo(), then
bar()):
---------------------
pushl %ebp
xorl %eax, %eax
movl %esp, %ebp
popl %ebp
ret
pushl %ebp
xorl %eax, %eax
movl %esp, %ebp
subl $40, %esp
leave
ret
-----------------------
W.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8935