[Bug target/66822] Turn off X86_TUNE_ZERO_EXTEND_WITH_AND for -miamcu

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66822

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
Please hold a bit with this change, I have a patch that improves generation of
zero_extend substantially.
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From: "hjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/66821] reassoc-37.c fails on -march=iamcu
Date: Thu, 09 Jul 2015 20:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf821

--- Comment #10 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Thu Jul  9 20:35:56 2015
New Revision: 225635

URL: https://gcc.gnu.org/viewcvs?rev"5635&root=gcc&view=rev
Log:
Adjust variable shift costs for IA MCU

We reduce code size for IA MCU by adjusting variable shift costs for IA
MCU

        PR target/66821
        * config/i386/i386.c (iamcu_cost): Adjust variable shift costs.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c