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From: CBFalconer <cbfalconer AT yahoo DOT com>
Organization: Ched Research
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Newsgroups: comp.os.msdos.djgpp,comp.lang.c
Subject: Re: gcc 2.953 output - is this a bug?
References: <3C61E6BB DOT 7F9AD526 AT yahoo DOT com> <WOl88.110475$I8 DOT 22755763 AT news4 DOT rdc1 DOT on DOT home DOT com>
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Date: Thu, 07 Feb 2002 04:51:51 GMT
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Tom St Denis wrote:
> 
> "CBFalconer" <cbfalconer AT yahoo DOT com> wrote in message
> news:3C61E6BB DOT 7F9AD526 AT yahoo DOT com...
> > Please look at the following disassembly:
> >
> >  585:   8d 04 d2                lea    (%edx,%edx,8),%eax <<***
> >  588:   8d 04 82                lea    (%edx,%eax,4),%eax <<***
> 
> If I get this right [in NASM notation] the two lines are
> 
> [1] lea eax,[edx+edx*8]
> [2] lea eax,[edx+eax*4]
> 
> In line [1] you get eax = edx + edx * 8 = 9*edx
> 
> In line [2] you get eax = edx + 4*(9*edx) = 37 * edx
> 
> since I assume edx equals the original value, this should compute 37 * h

This showed up in djgpp.  Unplonk.  Thanks.

-- 
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