| buzbee | 1452bee | 2015-03-06 14:43:04 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Generic one-operand compare-and-branch operation. Provide a "revcmp" |
| 3 | * fragment that specifies the *reverse* comparison to perform, e.g. |
| 4 | * for "if-le" you would use "gt". |
| 5 | * |
| 6 | * for: if-eqz, if-nez, if-ltz, if-gez, if-gtz, if-lez |
| 7 | */ |
| 8 | /* if-cmp vAA, +BBBB */ |
| 9 | #if MTERP_SUSPEND |
| 10 | mov r0, rINST, lsr #8 @ r0<- AA |
| 11 | GET_VREG r2, r0 @ r2<- vAA |
| 12 | FETCH_S r1, 1 @ r1<- branch offset, in code units |
| 13 | cmp r2, #0 @ compare (vA, 0) |
| 14 | mov${revcmp} r1, #2 @ r1<- inst branch dist for not-taken |
| 15 | adds r1, r1, r1 @ convert to bytes & set flags |
| 16 | FETCH_ADVANCE_INST_RB r1 @ update rPC, load rINST |
| 17 | ldrmi rIBASE, [rSELF, #THREAD_CURRENT_IBASE_OFFSET] @ refresh table base |
| 18 | GET_INST_OPCODE ip @ extract opcode from rINST |
| 19 | GOTO_OPCODE ip @ jump to next instruction |
| 20 | #else |
| 21 | mov r0, rINST, lsr #8 @ r0<- AA |
| 22 | GET_VREG r2, r0 @ r2<- vAA |
| 23 | FETCH_S r1, 1 @ r1<- branch offset, in code units |
| 24 | ldr lr, [rSELF, #THREAD_FLAGS_OFFSET] |
| 25 | cmp r2, #0 @ compare (vA, 0) |
| 26 | mov${revcmp} r1, #2 @ r1<- inst branch dist for not-taken |
| 27 | adds r1, r1, r1 @ convert to bytes & set flags |
| 28 | FETCH_ADVANCE_INST_RB r1 @ update rPC, load rINST |
| 29 | bmi MterpCheckSuspendAndContinue |
| 30 | GET_INST_OPCODE ip @ extract opcode from rINST |
| 31 | GOTO_OPCODE ip @ jump to next instruction |
| 32 | #endif |