linux-kernel - Re: [2.6.30-rc8] gcc 3.3 : _

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Message-Id: <200906052158.GGB12454.OFtMLOFFVQHSJO@I-love.SAKURA.ne.jp>
Date:	Fri, 5 Jun 2009 21:58:11 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	andreas.herrmann3@....com
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	xiyou.wangcong@...il.com, mingo@...e.hu
Subject: Re: [2.6.30-rc8] gcc 3.3 : __udivdi3 undefined.

Andreas Herrmann wrote:
> Overlooked the 64-bit division.
> Did test this with 4.[23].x compilers on 32-bit which didn't complain ...

gcc version 4.1.2 20080704 (Red Hat 4.1.2-44) generated below code.

        .loc 1 51 0
        movl    -48(%ebp), %eax # start.1059,
        movl    -44(%ebp), %edx # start.1059,
        addl    -24(%ebp), %eax # size,
        adcl    -20(%ebp), %edx # size,
        movl    %eax, -56(%ebp) #, count
        movl    %edx, -52(%ebp) #, count
        subl    %ebx, -56(%ebp) # last_bad.1061, count
.LVL28:
        sbbl    %esi, -52(%ebp) # last_bad.1061, count
        movl    -56(%ebp), %edx # count,
        movl    -52(%ebp), %ecx # count,
        shrdl   $3, %ecx, %edx  #,,
        shrl    $3, %ecx        #,
        movl    %edx, -56(%ebp) #, count
        movl    %ecx, -52(%ebp) #, count

It seems that only gcc 3.x genarates "call __udivdi3" ...
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