From: mily vishwa <milyvishwa@yahoo.com>
To: gcc-help@gcc.gnu.org
Subject: Fwd: Regd GCC Compiler optimization flags - pls ignore the prev mail
Date: Mon, 21 Jun 2004 05:41:00 -0000 [thread overview]
Message-ID: <20040621054131.93429.qmail@web50003.mail.yahoo.com> (raw)
Hi all
The Gcc Compiler online
document(http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html)
specifies that
"Not all optimizations are controlled directly by a
flag. Only optimizations that have a flag are listed.
"
Does this mean that for O1/O2/O3/Os optimization
levels, the compiler does some optimizations of which
only some of them
have flags listed ??? For example O1 consists of not
just these optimizations
-fdefer-pop
-fmerge-constants
-fthread-jumps
-floop-optimize
-fif-conversion
-fif-conversion2
-fdelayed-branch
-fguess-branch-probability
-fcprop-registers
but some other additional optimization ones too
If the above is true , then can anyone let me know as
to what kind of optimizations are done by the compiler
for which the flags are not listed ?
Regards
mily
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reply other threads:[~2004-06-21 5:41 UTC|newest]
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