RISC-V: Fix is_vlmax_len_p and use for strided ops.HEADtrunkmaster

This patch changes is_vlmax_len_p to handle VLS modes properly.

Before we would check if len == GET_MODE_NUNITS (mode).  This works vor
VLA modes but not necessarily for VLS modes.  We regularly have e.g.
small VLS modes where LEN equals their number of units but which do not
span a full vector.  Therefore now check if len * GET_MODE_UNIT_SIZE
(mode) equals BYTES_PER_RISCV_VECTOR * TARGET_MAX_LMUL.

Changing this uncovered an oversight in avlprop where we used
GET_MODE_NUNITS as AVL when GET_MODE_NUNITS / NF would be correct.

The testsuite is unchanged.  I didn't bother to add a dedicated test
because we would have seen the fallout any way once the gather patch
lands.

gcc/ChangeLog:

	* config/riscv/riscv-v.cc (is_vlmax_len_p): Properly handle VLS
	modes.
	(imm_avl_p): Fix VLS length check.
	(expand_strided_load): Use is_vlmax_len_p.
	(expand_strided_store): Ditto.
	* config/riscv/riscv-avlprop.cc (pass_avlprop::execute):
	Use GET_MODE_NUNITS / NF as avl.

0 files changed, 0 insertions, 0 deletions