[AArch64] Support the 'crc' extension in -march and -mcpu options.

gcc/

	* config/aarch64/aarch64-option-extensions.def: Add
	AARCH64_OPT_EXTENSION of 'crc'.
	* config/aarch64/aarch64.h (AARCH64_FL_CRC): New define.
	(AARCH64_ISA_CRC): Ditto.
	* doc/invoke.texi (-march and -mcpu feature modifiers): Add
	description of the CRC extension.

From-SVN: r202275

gcc/ChangeLog

+2013-09-05  Yufeng Zhang  <yufeng.zhang@arm.com>
+
+	* config/aarch64/aarch64-option-extensions.def: Add
+	AARCH64_OPT_EXTENSION of 'crc'.
+	* config/aarch64/aarch64.h (AARCH64_FL_CRC): New define.
+	(AARCH64_ISA_CRC): Ditto.
+	* doc/invoke.texi (-march and -mcpu feature modifiers): Add
+	description of the CRC extension.
+
 2013-09-05  Alexander Ivchenko  <alexander.ivchenko@intel.com>
 
 	* config/rs6000/linux64.h: Define OPTION_BIONIC and OPTION_UCLIBC.

gcc/config/aarch64/aarch64-option-extensions.def

@@ -35,3 +35,4 @@
 AARCH64_OPT_EXTENSION("fp",	AARCH64_FL_FP,	AARCH64_FL_FPSIMD | AARCH64_FL_CRYPTO)
 AARCH64_OPT_EXTENSION("simd",	AARCH64_FL_FPSIMD,	AARCH64_FL_SIMD | AARCH64_FL_CRYPTO)
 AARCH64_OPT_EXTENSION("crypto",	AARCH64_FL_CRYPTO | AARCH64_FL_FPSIMD,	AARCH64_FL_CRYPTO)
+AARCH64_OPT_EXTENSION("crc",	AARCH64_FL_CRC,	AARCH64_FL_CRC)

gcc/config/aarch64/aarch64.h

@@ -158,6 +158,7 @@
 #define AARCH64_FL_FP         (1 << 1)	/* Has FP.  */
 #define AARCH64_FL_CRYPTO     (1 << 2)	/* Has crypto.  */
 #define AARCH64_FL_SLOWMUL    (1 << 3)	/* A slow multiply core.  */
+#define AARCH64_FL_CRC        (1 << 4)	/* Has CRC.  */
 
 /* Has FP and SIMD.  */
 #define AARCH64_FL_FPSIMD     (AARCH64_FL_FP | AARCH64_FL_SIMD)
@@ -170,6 +171,7 @@
 
 /* Macros to test ISA flags.  */
 extern unsigned long aarch64_isa_flags;
+#define AARCH64_ISA_CRC            (aarch64_isa_flags & AARCH64_FL_CRC)
 #define AARCH64_ISA_CRYPTO         (aarch64_isa_flags & AARCH64_FL_CRYPTO)
 #define AARCH64_ISA_FP             (aarch64_isa_flags & AARCH64_FL_FP)
 #define AARCH64_ISA_SIMD           (aarch64_isa_flags & AARCH64_FL_SIMD)

gcc/doc/invoke.texi

@@ -11173,6 +11173,8 @@ Feature modifiers used with @option{-march} and @option{-mcpu} can be one
 the following:
 
 @table @samp
+@item crc
+Enable CRC extension.
 @item crypto
 Enable Crypto extension.  This implies Advanced SIMD is enabled.
 @item fp