https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70708
--- Comment #9 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> --- Author: hjl Date: Mon Apr 18 19:40:30 2016 New Revision: 235169 URL: https://gcc.gnu.org/viewcvs?rev=235169&root=gcc&view=rev Log: Optimize load double into xmm with zero_extend "movq" should used to load double into xmm register with zero_extend: (set (reg:V2DF 90) (vec_concat:V2DF (reg/v:DF 88 [ d ]) (const_double:DF 0.0 [0x0.0p+0]))) Unlike "movsd", which only works with load from memory, "movq" works with both memory and xmm register. gcc/ PR target/70708 * config/i386/sse.md (sse2_loadlpd): Accept load from "xm" and replace %vmovsd with "%vmovq". (vec_concatv2df): Likewise. gcc/testsuite/ PR target/70708 * gcc.target/i386/pr70708.c: New test. Added: trunk/gcc/testsuite/gcc.target/i386/pr70708.c Modified: trunk/gcc/ChangeLog trunk/gcc/config/i386/sse.md trunk/gcc/testsuite/ChangeLog
