https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106022
--- Comment #18 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by H.J. Lu <h...@gcc.gnu.org>: https://gcc.gnu.org/g:f3a5e75cb66dc96efca7d494fe6060746c88acb1 commit r13-1415-gf3a5e75cb66dc96efca7d494fe6060746c88acb1 Author: H.J. Lu <hjl.to...@gmail.com> Date: Fri Jun 17 17:02:05 2022 -0700 x86: Support 2/4/8 byte constant vector stores 1. Add a predicate for constant vectors which can be converted to integer constants suitable for constant integer stores. For a 8-byte constant vector, the converted 64-bit integer must be valid for store with 64-bit immediate, which is a 64-bit integer sign-extended from a 32-bit integer. 2. Add a new pattern to allow 2-byte, 4-byte and 8-byte constant vector stores, like (set (mem:V2HI (reg:DI 84)) (const_vector:V2HI [(const_int 0 [0]) (const_int 1 [0x1])])) 3. After reload, convert constant vector stores to constant integer stores, like (set (mem:SI (reg:DI 5 di [84])) (const_int 65536 [0x10000])) For void foo (short * c) { c[0] = 0; c[1] = 1; } it generates movl $65536, (%rdi) instead of movl .LC0(%rip), %eax movl %eax, (%rdi) gcc/ PR target/106022 * config/i386/i386-protos.h (ix86_convert_const_vector_to_integer): New. * config/i386/i386.cc (ix86_convert_const_vector_to_integer): New. * config/i386/mmx.md (V_16_32_64): New. (*mov<mode>_imm): New patterns for stores with 16-bit, 32-bit and 64-bit constant vector. * config/i386/predicates.md (x86_64_const_vector_operand): New. gcc/testsuite/ PR target/106022 * gcc.target/i386/pr106022-1.c: New test. * gcc.target/i386/pr106022-2.c: Likewise. * gcc.target/i386/pr106022-3.c: Likewise. * gcc.target/i386/pr106022-4.c: Likewise.