| buzbee | 1452bee | 2015-03-06 14:43:04 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Generic two-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-eq, if-ne, if-lt, if-ge, if-gt, if-le |
| 7 | */ |
| 8 | /* if-cmp vA, vB, +CCCC */ |
| 9 | #if MTERP_SUSPEND |
| 10 | mov r1, rINST, lsr #12 @ r1<- B |
| 11 | ubfx r0, rINST, #8, #4 @ r0<- A |
| 12 | GET_VREG r3, r1 @ r3<- vB |
| 13 | GET_VREG r2, r0 @ r2<- vA |
| 14 | FETCH_S r1, 1 @ r1<- branch offset, in code units |
| 15 | cmp r2, r3 @ compare (vA, vB) |
| 16 | mov${revcmp} r1, #2 @ r1<- BYTE branch dist for not-taken |
| 17 | adds r2, r1, r1 @ convert to bytes, check sign |
| 18 | FETCH_ADVANCE_INST_RB r2 @ update rPC, load rINST |
| 19 | ldrmi rIBASE, [rSELF, #THREAD_CURRENT_IBASE_OFFSET] @ refresh rIBASE |
| 20 | GET_INST_OPCODE ip @ extract opcode from rINST |
| 21 | GOTO_OPCODE ip @ jump to next instruction |
| 22 | #else |
| 23 | mov r1, rINST, lsr #12 @ r1<- B |
| 24 | ubfx r0, rINST, #8, #4 @ r0<- A |
| 25 | GET_VREG r3, r1 @ r3<- vB |
| 26 | GET_VREG r2, r0 @ r2<- vA |
| 27 | ldr lr, [rSELF, #THREAD_FLAGS_OFFSET] |
| 28 | FETCH_S r1, 1 @ r1<- branch offset, in code units |
| 29 | cmp r2, r3 @ compare (vA, vB) |
| 30 | mov${revcmp} r1, #2 @ r1<- BYTE branch dist for not-taken |
| 31 | adds r2, r1, r1 @ convert to bytes, check sign |
| 32 | FETCH_ADVANCE_INST_RB r2 @ update rPC, load rINST |
| 33 | bmi MterpCheckSuspendAndContinue |
| 34 | GET_INST_OPCODE ip @ extract opcode from rINST |
| 35 | GOTO_OPCODE ip @ jump to next instruction |
| 36 | #endif |