> gcc -v
Using built-in specs.
Target: i386-apple-darwin9.2.2
Configured with: ../gcc/configure --prefix=/usr/local/gcc44
--enable-threads=posix --with-arch=core2 --with-tune=core2 --with-gmp=/sw
--with-mpfr=/sw --disable-nls --disable-bootstrap --enable-checking=yes,rtl
--enable-languages=c,c++,objc
Thread model: posix
gcc version 4.4.0 20080611 (experimental) (GCC)
gcc changes esp in every function, even if it has no stack values. Given:
int a;
void f() {a++;}
> gcc -O -fomit-frame-pointer -fno-pic -S add.c
_f:
subl $12, %esp
incl _a
addl $12, %esp
ret
Apple's GCC doesn't do this and neither does 4.4 on other systems (as far as I
know).
--
Summary: i386/darwin generates unnecessary stack ops in every
function
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: astrange at ithinksw dot com
GCC target triplet: i386-apple-darwin*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36502
