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To: Falk Hueffner <falk.hueffner@student.uni-tuebingen.de>
Cc: gcc list <gcc@gcc.gnu.org>
Subject: Re: GCC performance regression - its memset !
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From: Andreas Schwab <schwab@suse.de>
Date: Tue, 23 Apr 2002 06:53:00 -0000
In-Reply-To: <st2lmbesk8j.fsf@student.uni-tuebingen.de> (Falk Hueffner's
 message of "23 Apr 2002 13:54:52 +0200")
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Falk Hueffner <falk.hueffner@student.uni-tuebingen.de> writes:

|> 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?

Please try -D__NO_STRING_INLINES.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
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