[Bug rtl-optimization/27357] 20 % increase code size in 4.1 vs 3.4.5

[etienne_lorrain at yahoo dot fr]

------- Comment #2 from etienne_lorrain at yahoo dot fr  2006-05-24 13:22 -------
etienne@cygne:~/projet/gujin$ /home/etienne/projet/toolchain/bin/gcc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../configure --prefix=/home/etienne/projet/toolchain
--enable-languages=c
Thread model: posix
gcc version 4.1.1 20060517 (prerelease)
etienne@cygne:~/projet/gujin$ /home/etienne/projet/toolchain/bin/gcc tmp1.c -Os
-c -o tmp.o && size tmp.o
   text    data     bss     dec     hex filename
    279       0       0     279     117 tmp.o
etienne@cygne:~/projet/gujin$ /home/etienne/projet/toolchain/bin/gcc tmp1.c -Os
-c -o tmp.o -fno-optimize-sibling-calls && size tmp.o
   text    data     bss     dec     hex filename
    251       0       0     251      fb tmp.o

  So "tail return optimization" disabled by -fno-optimize-sibling-calls has at
least something to do with the size increase.

 Note that this new GCC-4.1.1 prerelease also produce such code:
        addl    $12, %esp
        leal    -12(%ebp), %esp
        pop     allregs
        ret


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27357