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Add support for CLZERO ISA

From: "Stepanyan, Victoria" <Victoria dot Stepanyan at amd dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: "Kumar, Venkataramanan" <Venkataramanan dot Kumar at amd dot com>
Date: Wed, 25 Nov 2015 16:21:14 +0000
Subject: Add support for CLZERO ISA
Authentication-results: sourceware.org; auth=none
Authentication-results: spf=none (sender IP is ) smtp dot mailfrom=Victoria dot Stepanyan at amd dot com;

Hi Maintainers,

This patch adds support for CLZERO instruction. 
The ISA is enabled by new -mclzero option  and is available for AMD znver1 target (-march=znver1). 
Bootstrapped and retested. 
gcc/ChangeLog: 

2015-11-25 Victoria Stepanyan  <victoria.stepanyan@amd.com>

        * common/config/i386/i386-common.c
        (OPTION_MASK_ISA_CLZERO_SET): New.
        (ix86_handle_option): Handle clzero.
       * config.gcc (i[34567]86-*-*): Add clzerointrin.h,
        (x86_64-*-*): Likewise. 
        * config/i386/clzerointrin.h: New header.
        * config/i386/cpuid.h (bit_CLZERO):  Define.
        * config/i386/driver-i386.c (host_detect_local_cpu): Detect
        CLZERO support.
       * config/i386/i386.opt (clzero): New. 
       * config/i386/i386-c.c: Define __CLZERO__ if needed.
        * config/i386/i386.c (ix86_target_string): Define -mclzero option.
        (PTA_CLZERO): New.
        (ix86_option_override_internal): Handle new option.
        (processor_alias_table): Added PTA_CLZERO.
        (ix86_valid_target_attribute_inner_p): Add OPT_mclzero.
        (ix86_builtins): Add IX86_BUILTIN_CLZERO, IX86_BUILTIN_CLZERO.
        (ix86_expand_builtin): Handle IX86_BUILTIN_CLZERO and 
        IX86_BUILTIN_CLZERO  built-ins.
        * config/i386/i386.h (TARGET_CLZERO):  New.
        * config/i386/i386.md (unspecv): Add UNSPEC_CLZERO.
        (clzero):  New pattern.
        (clzero_<mode>): New pattern.
        * config/i386/x86intrin.h: Include clzerointrin.h.
       * doc/extend.texi: Document clzero builtins.
       * doc/invoke.texi: Document -mclzero option.

gcc/testsuite/ChangeLog:

2015-11-25 Victoria Stepanyan  <victoria.stepanyan@amd.com>

        * gcc.target/i386/clzero.c: New.
        * gcc.target/i386/sse-12.c: Add -mclzero.
        * gcc.target/i386/sse-13.c: Ditto.
        * gcc.target/i386/sse-14.c: Ditto.
        * gcc.target/i386/sse-22.c: Ditto.
        * gcc.target/i386/sse-23.c: Ditto.
        * g++.dg/other/i386-2.C: Ditto.
        * g++.dg/other/i386-3.C: Ditto.  
      
Ok for trunk ?

Victoria

Attachment: clzero.patch.txt
Description: clzero.patch.txt

Follow-Ups:
- Re: Add support for CLZERO ISA
  - From: Joseph Myers

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