| %default {"preinstr":"", "result":"a0", "chkzero":"0"} | |
| /* | |
| * Generic 32-bit "lit16" binary operation. Provide an "instr" line | |
| * that specifies an instruction that performs "result = a0 op a1". | |
| * This could be an MIPS instruction or a function call. (If the result | |
| * comes back in a register other than a0, you can override "result".) | |
| * | |
| * If "chkzero" is set to 1, we perform a divide-by-zero check on | |
| * vCC (a1). Useful for integer division and modulus. | |
| * | |
| * For: add-int/lit16, rsub-int, mul-int/lit16, div-int/lit16, | |
| * rem-int/lit16, and-int/lit16, or-int/lit16, xor-int/lit16 | |
| */ | |
| /* binop/lit16 vA, vB, +CCCC */ | |
| FETCH_S(a1, 1) # a1 <- ssssCCCC (sign-extended) | |
| GET_OPB(a2) # a2 <- B | |
| GET_OPA4(rOBJ) # rOBJ <- A+ | |
| GET_VREG(a0, a2) # a0 <- vB | |
| .if $chkzero | |
| # cmp a1, 0; is second operand zero? | |
| beqz a1, common_errDivideByZero | |
| .endif | |
| FETCH_ADVANCE_INST(2) # advance rPC, load rINST | |
| $preinstr # optional op | |
| $instr # $result <- op, a0-a3 changed | |
| GET_INST_OPCODE(t0) # extract opcode from rINST | |
| SET_VREG_GOTO($result, rOBJ, t0) # vA <- $result |