| %def binop(preinstr="", result="r0", chkzero="0", instr=""): | |
| /* | |
| * Generic 32-bit binary operation. Provide an "instr" line that | |
| * specifies an instruction that performs "result = r0 op r1". | |
| * This could be an ARM instruction or a function call. (If the result | |
| * comes back in a register other than r0, you can override "result".) | |
| * | |
| * If "chkzero" is set to 1, we perform a divide-by-zero check on | |
| * vCC (r1). Useful for integer division and modulus. Note that we | |
| * *don't* check for (INT_MIN / -1) here, because the ARM math lib | |
| * handles it correctly. | |
| * | |
| * For: add-int, sub-int, mul-int, div-int, rem-int, and-int, or-int, | |
| * xor-int, shl-int, shr-int, ushr-int, add-float, sub-float, | |
| * mul-float, div-float, rem-float | |
| */ | |
| /* binop vAA, vBB, vCC */ | |
| FETCH r0, 1 @ r0<- CCBB | |
| mov r9, rINST, lsr #8 @ r9<- AA | |
| mov r3, r0, lsr #8 @ r3<- CC | |
| and r2, r0, #255 @ r2<- BB | |
| GET_VREG r1, r3 @ r1<- vCC | |
| GET_VREG r0, r2 @ r0<- vBB | |
| .if $chkzero | |
| cmp r1, #0 @ is second operand zero? | |
| beq common_errDivideByZero | |
| .endif | |
| FETCH_ADVANCE_INST 2 @ advance rPC, load rINST | |
| $preinstr @ optional op; may set condition codes | |
| $instr @ $result<- op, r0-r3 changed | |
| GET_INST_OPCODE ip @ extract opcode from rINST | |
| SET_VREG $result, r9 @ vAA<- $result | |
| GOTO_OPCODE ip @ jump to next instruction | |
| /* 11-14 instructions */ |