https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80180
--- Comment #1 from uros at gcc dot gnu.org --- Author: uros Date: Sat Mar 25 16:34:09 2017 New Revision: 246475 URL: https://gcc.gnu.org/viewcvs?rev=246475&root=gcc&view=rev Log: PR target/80180 * config/i386/i386.c (ix86_expand_builtin) <IX86_BUILTIN_RDSEED{16,32,64}_STEP>: Do not expand arg0 between flags reg setting and flags reg using instructions. <IX86_BUILTIN_RDRAND{16,32,64}_STEP>: Ditto. Use non-flags reg clobbering instructions to zero extend op2. Modified: trunk/gcc/ChangeLog trunk/gcc/config/i386/i386.c