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Re: Wrap calculation of PIC address into a single instruction

From: Andrew Pinski <pinskia at gmail dot com>
To: Maxim Kuvyrkov <maxim at codesourcery dot com>
Cc: Richard Earnshaw <Richard dot Earnshaw at arm dot com>, gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Wed, 23 Jun 2010 14:22:20 -0700
Subject: Re: Wrap calculation of PIC address into a single instruction
References: <4C18F225.2040509@codesourcery.com> <4C227243.9080104@codesourcery.com> <4C227A74.1070201@codesourcery.com>

On Wed, Jun 23, 2010 at 2:19 PM, Maxim Kuvyrkov <maxim@codesourcery.com> wrote:
> This patch enables optimizations, particularly GCSE, handle calculation of
> PIC addresses. ÂGCSE tracks only single instructions, so it can't handle
> two-instruction calculation of PIC address.

The reg_equal note on the second instruction should have been enough
to solve this issue.  This is how it is optimized on PowerPC and some
other targets.  Why is not working for arm?

Thanks,
Andrew Pinski

References:
- Improvements to code hoisting
  - From: Maxim Kuvyrkov
- ARM improvements for GCSE
  - From: Maxim Kuvyrkov
- Wrap calculation of PIC address into a single instruction
  - From: Maxim Kuvyrkov

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