The attached patch limits the MEMSET (setmemsi pattern) and MEMCPY (movmemsi pattern) instructions to 0-511 bytes. There is a hardware limitation on large MEMSET, MEMCPY operations that the library versions of memset() and memcpy() deal with.
[gcc] 2015-09-29 James Bowman <james.bow...@ftdichip.com> * config/ft32/predicates.md (ft32_imm_operand): New predicate. * config/ft32/ft32.md (movmemsi, setmemsi): Use ft32_imm_operand predicate, disallow register for operand 2. Index: gcc/config/ft32/ft32.md =================================================================== --- gcc/config/ft32/ft32.md (revision 228109) +++ gcc/config/ft32/ft32.md (working copy) @@ -841,19 +841,19 @@ ) (define_insn "movmemsi" - [(set (match_operand:BLK 0 "memory_operand" "=W,W,BW") - (match_operand:BLK 1 "memory_operand" "W,W,BW")) - (use (match_operand:SI 2 "ft32_rimm_operand" "r,KA,rKA")) + [(set (match_operand:BLK 0 "memory_operand" "=W,BW") + (match_operand:BLK 1 "memory_operand" "W,BW")) + (use (match_operand:SI 2 "ft32_imm_operand" "KA,KA")) (use (match_operand:SI 3)) ] "" - "memcpy.%d3 %b0,%b1,%2 # %3!" + "memcpy.%d3 %b0,%b1,%2 " ) (define_insn "setmemsi" - [(set (match_operand:BLK 0 "memory_operand" "=BW,BW") (unspec:BLK [ - (use (match_operand:QI 2 "register_operand" "r,r")) - (use (match_operand:SI 1 "ft32_rimm_operand" "r,KA")) + [(set (match_operand:BLK 0 "memory_operand" "=BW") (unspec:BLK [ + (use (match_operand:QI 2 "register_operand" "r")) + (use (match_operand:SI 1 "ft32_imm_operand" "KA")) ] UNSPEC_SETMEM)) (use (match_operand:SI 3)) ] Index: gcc/config/ft32/predicates.md =================================================================== --- gcc/config/ft32/predicates.md (revision 228109) +++ gcc/config/ft32/predicates.md (working copy) @@ -80,6 +80,10 @@ (and (match_code "const_int") (match_test "IN_RANGE (INTVAL (op), -512, 511)")))) +(define_predicate "ft32_imm_operand" + (and (match_code "const_int") + (match_test "IN_RANGE (INTVAL (op), -512, 511)"))) + (define_predicate "ft32_bwidth_operand" (and (match_code "const_int") (match_test "IN_RANGE (INTVAL (op), 1, 16)")))