[Bug rtl-optimization/21182] gcc can use registers but uses stack instead

[vda at port dot imtp dot ilyichevsk dot odessa dot ua]

------- Additional Comments From vda at port dot imtp dot ilyichevsk dot odessa dot ua  2005-04-23 22:49 -------
Aha!
I found out that gcc will use registers with -O3, but not with -O2.

# gcc -O3 serpent.c -S -o serpent-O3.s
# gcc -O2 serpent.c -S -o serpent-O2.s
# ls -l
-rw-r--r--  1 root root 27975 Apr 24 01:47 serpent-O2.s
-rw-r--r--  1 root root 21566 Apr 24 01:47 serpent-O3.s
# wc -l serpent-O2.s serpent-O3.s
 1558 serpent-O2.s
 1265 serpent-O3.s
 2823 total

I don't have 4.0.0 here yet...

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21182