PR target/52607
* config/i386/i386.md ("isa" attribute): Add avx2 and noavx2.
("enabled" attribute): Handle avx2 and noavx2 isas.
* config/i386/sse.md (avx2_vec_dupv8sf_1, avx2_pbroadcast<mode>_1):
New insns.
(vec_dup<mode>): Add avx2 =x,x alternative.
(vec_dup<mode> splitter): Don't split if TARGET_AVX2.
(*avx_vperm_broadcast_<mode>): Don't split V4DFmode if TARGET_AVX2.
For TARGET_AVX2, V8SFmode and elt == 0 split into vbroadcastss.
* config/i386/i386.c (expand_vec_perm_pshufb): Emit also vpermps
for V8SFmode.
(expand_vec_perm_1): For broadcasts, use avx2_pbroadcast<mode>_1
if possible, handle also V8SFmode.
From-SVN: r185577
