| Bill Buzbee | 3b0b4b9 | 2016-02-02 13:45:36 +0000 | [diff] [blame] | 1 | %default {"preinstr":"", "result":"w0", "chkzero":"0"} |
| 2 | /* |
| 3 | * Generic 32-bit "lit8" binary operation. Provide an "instr" line |
| 4 | * that specifies an instruction that performs "result = w0 op w1". |
| 5 | * This could be an ARM instruction or a function call. (If the result |
| 6 | * comes back in a register other than w0, you can override "result".) |
| 7 | * |
| 8 | * If "chkzero" is set to 1, we perform a divide-by-zero check on |
| 9 | * vCC (w1). Useful for integer division and modulus. |
| 10 | * |
| 11 | * For: add-int/lit8, rsub-int/lit8, mul-int/lit8, div-int/lit8, |
| 12 | * rem-int/lit8, and-int/lit8, or-int/lit8, xor-int/lit8, |
| 13 | * shl-int/lit8, shr-int/lit8, ushr-int/lit8 |
| 14 | */ |
| 15 | /* binop/lit8 vAA, vBB, #+CC */ |
| Vladimir Marko | 20421b9 | 2016-07-26 16:38:11 +0100 | [diff] [blame] | 16 | FETCH_S w3, 1 // w3<- ssssCCBB (sign-extended for CC) |
| Bill Buzbee | 3b0b4b9 | 2016-02-02 13:45:36 +0000 | [diff] [blame] | 17 | lsr w9, wINST, #8 // w9<- AA |
| 18 | and w2, w3, #255 // w2<- BB |
| 19 | GET_VREG w0, w2 // w0<- vBB |
| 20 | asr w1, w3, #8 // w1<- ssssssCC (sign extended) |
| 21 | .if $chkzero |
| 22 | cbz w1, common_errDivideByZero |
| 23 | .endif |
| 24 | FETCH_ADVANCE_INST 2 // advance rPC, load rINST |
| 25 | $preinstr // optional op; may set condition codes |
| 26 | $instr // $result<- op, w0-w3 changed |
| 27 | GET_INST_OPCODE ip // extract opcode from rINST |
| 28 | SET_VREG $result, w9 // vAA<- $result |
| 29 | GOTO_OPCODE ip // jump to next instruction |
| 30 | /* 10-12 instructions */ |