vector: constrain index load/store for eew64 and xlen32

Section 18.3 says
"The V extension supports all vector load and store instructions
(Section Vector Loads and Stores), except the V extension does not
support EEW=64 for index values when XLEN=32"

Signed-off-by: Chih-Min Chao <[email protected]>

Author: chihminchao

riscv/v_ext_macros.h

@@ -90,6 +90,7 @@ static inline bool is_overlapped_widen(const int astart, int asize,
 #define VI_CHECK_ST_INDEX(elt_width) \
   require_vector(false); \
   require(elt_width <= P.VU.ELEN); \
+  require(elt_width <= P.get_xlen()); \
   float vemul = ((float)elt_width / P.VU.vsew * P.VU.vflmul); \
   require(vemul >= 0.125 && vemul <= 8); \
   reg_t UNUSED emul = vemul < 1 ? 1 : vemul; \