Retry rdrand if the carry flag isn't valid.

gcc/

2010-07-07  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/44844
	* config/i386/i386.md (rdrand<mode>): Changed to expand to
	retry if the carry flag isn't valid.
	(rdrand<mode>_1): New.

gcc/testsuite/

2010-07-07  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/44844
	* gcc.target/i386/rdrand-1.c: Scan "jnc".
	* gcc.target/i386/rdrand-2.c: Likewise.
	* gcc.target/i386/rdrand-3.c: Likewise.

From-SVN: r161910