This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Re: i386 string compare - code quality regression from 2.95
- To: Richard Henderson <rth at redhat dot com>, gcc-patches at gcc dot gnu dot org
- Subject: Re: i386 string compare - code quality regression from 2.95
- From: "Zack Weinberg" <zackw at Stanford dot EDU>
- Date: Mon, 14 May 2001 22:51:09 -0700
- References: <20010514163246.B774@stanford.edu> <20010514223216.A24171@redhat.com>
On Mon, May 14, 2001 at 10:32:16PM -0700, Richard Henderson wrote:
>
> > + (compare:CC (mem:BLK (match_operand:SI 4 "register_operand" "0"))
> > + (mem:BLK (match_operand:SI 5 "register_operand" "1"))))
> > + (use (match_operand:SI 6 "register_operand" "2"))
> > + (use (match_operand:SI 3 "immediate_operand" "i"))
> > + (use (reg:SI 19))
> > + (clobber (match_operand:SI 0 "register_operand" "=S"))
> > + (clobber (match_operand:SI 1 "register_operand" "=D"))
> > + (clobber (match_operand:SI 2 "register_operand" "=c"))])
>
> Remove the constraints here; they are unused.
I'm not sure what you mean. All of them, or just the register
selections on the clobbers, or what? What about the predicates, are
they necessary?
--
zw A man who has never gone to school may steal from a freight car, but if he
has a university education, he may steal the whole railroad.
-- Theodore Roosevelt