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From: "Tom St Denis" <tomstdenis AT yahoo DOT com>
Newsgroups: comp.os.msdos.djgpp,comp.lang.c
References: <3C61E6BB DOT 7F9AD526 AT yahoo DOT com> <WOl88.110475$I8 DOT 22755763 AT news4 DOT rdc1 DOT on DOT home DOT com> <3C6206BF DOT 3BAF19BF AT yahoo DOT com>
Subject: Re: gcc 2.953 output - is this a bug?
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Date: Thu, 07 Feb 2002 11:19:09 GMT
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To: djgpp AT delorie DOT com
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"CBFalconer" <cbfalconer AT yahoo DOT com> wrote in message
news:3C6206BF DOT 3BAF19BF AT yahoo DOT com...
> 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.

Not that I'm trying to start anything.... BUT WHO CARES WHO YOU PLONK?

I mean is it a feeling of authority or power over others?  You want to
control their behaviour?  Is plonking the same as a slap on the wrist?

Myself I have all of two people in my killfile, when I added them I didn't
send a message "plonk" because the purpose of a killfile is to lower useless
traffic.

Anyways, interesting question about GCC, it appears it optimizes "less
optimized" code better which is a point for the general idea of "write clear
code and the let the optimizer optimize it".

Tom