http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17731
Steven Bosscher <steven at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Last reconfirmed|2006-01-16 06:19:32 |2011-05-22 17:27:32
Resolution| |FIXED
--- Comment #8 from Steven Bosscher <steven at gcc dot gnu.org> 2011-05-22
15:30:58 UTC ---
(In reply to comment #2)
> Yes, that's fine.
> The java front end generates trees like <shift op <and op 31>>.
> I would like the extra "and" to be optimized out somewhere
> along the way, on a target-specific basis.
Fixed by tree-ssa::
$ cat t.c
int shift (int x, int y)
{
int _y = y & 31;
return x << _y;
}
$ ./cc1 -quiet -m32 -O2 t.c -fdump-tree-optimized
$ cat t.s
.file "t.c"
.text
.p2align 4,,15
.globl shift
.type shift, @function
shift:
.LFB0:
.cfi_startproc
movl 4(%esp), %eax
movl 8(%esp), %ecx
sall %cl, %eax
ret
.cfi_endproc
.LFE0:
.size shift, .-shift
.ident "GCC: (GNU) 4.6.0 20110312 (experimental) [trunk revision
170907]"
.section .note.GNU-stack,"",@progbits
