1 %default {"result":"a0", "chkzero":"0"} 2 /* 3 * Generic 32-bit "lit16" binary operation. Provide an "instr" line 4 * that specifies an instruction that performs "result = a0 op a1". 5 * This could be an MIPS instruction or a function call. (If the result 6 * comes back in a register other than a0, you can override "result".) 7 * 8 * If "chkzero" is set to 1, we perform a divide-by-zero check on 9 * vCC (a1). Useful for integer division and modulus. 10 * 11 * For: add-int/lit16, rsub-int, mul-int/lit16, div-int/lit16, 12 * rem-int/lit16, and-int/lit16, or-int/lit16, xor-int/lit16 13 */ 14 # binop/lit16 vA, vB, /* +CCCC */ 15 FETCH_S(a1, 1) # a1 <- ssssCCCC (sign-extended) 16 GET_OPB(a2) # a2 <- B 17 GET_OPA(rOBJ) # rOBJ <- A+ 18 GET_VREG(a0, a2) # a0 <- vB 19 and rOBJ, rOBJ, 15 20 .if $chkzero 21 # cmp a1, 0; is second operand zero? 22 beqz a1, common_errDivideByZero 23 .endif 24 FETCH_ADVANCE_INST(2) # advance rPC, load rINST 25 26 $instr # $result <- op, a0-a3 changed 27 GET_INST_OPCODE(t0) # extract opcode from rINST 28 SET_VREG_GOTO($result, rOBJ, t0) # vAA <- $result 29 /* 10-13 instructions */ 30 31
