This is a regression present since the 10.x series, but the underlying issue 
has been there since the TARGET_VEC_PERM_CONST hook was implemented, in the 
form of an ICE when expanding a constant VEC_PERM_EXPR in V4QI, while the 
back-end only supports V8QI constant VEC_PERM_EXPRs.

Tested on SPARC/Solaris, applied to all active branches.


2022-05-10  Eric Botcazou  <ebotcazou@adacore.com>

	PR target/105292
	* config/sparc/sparc.cc (sparc_vectorize_vec_perm_const): Return
	true only for 8-byte vector modes.


2022-05-10  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc.target/sparc/20220510-1.c: New test.

-- 
Eric Botcazou