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Re: Patch ping

From: Paul Brook <paul at codesourcery dot com>
To: Richard Earnshaw <Richard dot Earnshaw at arm dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Wed, 28 Apr 2004 14:56:12 +0100
Subject: Re: Patch ping
Organization: CodeSourcery
References: <200404281433.58671.paul@codesourcery.com> <1083160020.14083.112.camel@pc960.cambridge.arm.com>

On Wednesday 28 April 2004 14:47, Richard Earnshaw wrote:
> On Wed, 2004-04-28 at 14:33, Paul Brook wrote:
> > Patch ping: Output dwarf expressions for memory locations involving
> > shifts.
> >
> > http://gcc.gnu.org/ml/gcc-patches/2004-04/msg00856.html
> >
> > Paul
>
> I don't think this is quite right.  The MULT code had some
> simplifications when one of the operands was 0.  However, a shift by
> zero is not the same as a multiply by zero -- the later results in zero,
> the former is a NOP.

Are you sure?
I see a check for (op0==0 || op1=0), but this is testing for successful 
evaluation, not actual values.

Paul

Follow-Ups:
- Re: Patch ping
  - From: Richard Earnshaw

References:
- Patch ping
  - From: Paul Brook
- Re: Patch ping
  - From: Richard Earnshaw

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