[PATCH Atom] Fix for PR target/50962 (bad AGU stall avoidance)

[Ilya Enkovich]

Hello,

Here is a fix for PR 50962. Fix improves AGU stall avoidance
optimization by adding opportunity to emit lea instead of mov when it
is profitable.

Bootstrapped and checked on linux-x86_64.

Could please someone review it?

Thanks,
Ilya
---
gcc/

2011-11-03  Enkovich Ilya  <ilya.enkov...@intel.com>

        PR target/50962
        * config/i386/i386-protos.h (ix86_use_lea_for_mov): New.
        * config/i386/i386.c (ix86_use_lea_for_mov): Likewise.
        * config/i386/i386.md (movsi_internal): Emit lea if profitable.
        (movdi_internal_rex64): Likewise.

PR50962.diff
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