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To: gcc list <gcc@gcc.gnu.org>
Subject: Re: GCC performance regression - its memset !
References: <20020421005718.GA16378@zoy.org> <20020422213222.GA21429@zoy.org>
	<20020422165953.A32536@redhat.com> <20020423001045.GA26276@zoy.org>
	<20020422171335.B32556@redhat.com> <20020423004239.GB26890@zoy.org>
From: Falk Hueffner <falk.hueffner@student.uni-tuebingen.de>
Date: Tue, 23 Apr 2002 05:03:00 -0000
In-Reply-To: <20020423004239.GB26890@zoy.org>
Message-ID: <st2lmbesk8j.fsf@student.uni-tuebingen.de>
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Hi,

while we're at it, when you have a prototype for memset, gcc forgets
about the alignment:

void f1(unsigned long *p) { memset(p, 0, 16); }
#include <string.h>
void f2(unsigned long *p) { memset(p, 0, 16); }

-> (Alpha)

0000000000000000 <f1>:
   0:   08 00 f0 b7     stq     zero,8(a0)
   4:   1f 04 ff 5f     fnop
   8:   00 00 f0 b7     stq     zero,0(a0)
   c:   01 80 fa 6b     ret
0000000000000020 <f2>:
  20:   0f 00 30 2c     ldq_u   t0,15(a0)
  24:   00 00 50 2c     ldq_u   t1,0(a0)
  28:   41 0e 30 48     mskqh   t0,a0,t0
  2c:   0f 00 30 3c     stq_u   t0,15(a0)
  30:   42 06 50 48     mskql   t1,a0,t1
  34:   08 00 f0 3f     stq_u   zero,8(a0)
  38:   00 00 50 3c     stq_u   t1,0(a0)
  3c:   01 80 fa 6b     ret

Is there anything that can be done about that?

        Falk