| %verify "executed" |
| %verify "forward, backward, self" |
| /* |
| * Unconditional branch, 32-bit offset. |
| * |
| * The branch distance is a signed code-unit offset, which we need to |
| * double to get a byte offset. |
| * |
| * Unlike most opcodes, this one is allowed to branch to itself, so |
| * our "backward branch" test must be "<=0" instead of "<0". The ORRS |
| * instruction doesn't affect the V flag, so we need to clear it |
| * explicitly. |
| */ |
| /* goto/32 +AAAAAAAA */ |
| FETCH(r0, 1) @ r0<- aaaa (lo) |
| FETCH(r1, 2) @ r1<- AAAA (hi) |
| cmp ip, ip @ (clear V flag during stall) |
| orrs r0, r0, r1, lsl #16 @ r0<- AAAAaaaa, check sign |
| mov r9, r0, asl #1 @ r9<- byte offset |
| ble common_backwardBranch @ backward branch, do periodic checks |
| FETCH_ADVANCE_INST_RB(r9) @ update rPC, load rINST |
| GET_INST_OPCODE(ip) @ extract opcode from rINST |
| GOTO_OPCODE(ip) @ jump to next instruction |
| |
