At both O0 and O3 conserve-stack is enabled.
"The compiler will attempt to use less stack space, even if that makes the
program slower."
Doesn't that contradict with -O2 and -O3?
gcc_inst/bin/gcc -O0 -Q foo.c --help=optimizers |grep conserve-stack
-fconserve-stack [enabled]
gcc_inst/bin/gcc -O3 -Q foo.c --help=optimizers |grep conserve-stack
-fconserve-stack [enabled]
gcc_inst/bin/gcc -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc/configure --disable-multilib --disable-static
--prefix=/home/edwin/gcc_inst/ --enable-languages=c,c++
--enable-checking=assert,df,fold,gc,misc,rtl,rtlflag,runtime,tree
Thread model: posix
gcc version 4.4.0 20081116 (experimental) [trunk revision 141912] (GCC)
--
Summary: -fconserve-stack enabled by default
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: edwintorok at gmail dot com
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38157
