https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89021
--- Comment #7 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> --- Author: hjl Date: Wed May 15 15:04:08 2019 New Revision: 271215 URL: https://gcc.gnu.org/viewcvs?rev=271215&root=gcc&view=rev Log: i386: Emulate MMX packsswb/packssdw/packuswb with SSE2 Emulate MMX packsswb/packssdw/packuswb with SSE packsswb/packssdw/packuswb plus moving bits 64:95 to bits 32:63 in SSE register. Only SSE register source operand is allowed. PR target/89021 * config/i386/i386-expand.c (ix86_move_vector_high_sse_to_mmx): New function. (ix86_split_mmx_pack): Likewise. * config/i386/i386-protos.h (ix86_move_vector_high_sse_to_mmx): New prototype. (ix86_split_mmx_pack): Likewise. * config/i386/i386.md (mmx_isa): New. (enabled): Also check mmx_isa. * config/i386/mmx.md (any_s_truncate): New code iterator. (s_trunsuffix): New code attr. (mmx_packsswb): Removed. (mmx_packssdw): Likewise. (mmx_packuswb): Likewise. (mmx_pack<s_trunsuffix>swb): New define_insn_and_split to emulate MMX packsswb/packuswb with SSE2. (mmx_packssdw): Likewise. * config/i386/predicates.md (register_mmxmem_operand): New. Modified: trunk/gcc/ChangeLog trunk/gcc/config/i386/i386-expand.c trunk/gcc/config/i386/i386-protos.h trunk/gcc/config/i386/i386.md trunk/gcc/config/i386/mmx.md trunk/gcc/config/i386/predicates.md
