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Branch with Link branches to a PC-relative offset, setting the register X30 to PC+4. It provides a hint that this is a subroutine call.
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
1 | 0 | 0 | 1 | 0 | 1 | imm26 | |||||||||||||||||||||||||
op |
BL <label>
BranchType branch_type = if op == '1' then BranchType_DIRCALL else BranchType_DIR;
bits(64) offset = SignExtend(imm26:'00', 64);
<label> | Is the program label to be unconditionally branched to. Its offset from the address of this instruction, in the range +/-128MB, is encoded as "imm26" times 4. |
if branch_type == BranchType_DIRCALL then X[30] = PC[] + 4;
BranchTo(PC[] + offset, BranchType_DIRCALL);[] + offset, branch_type);
Internal version only: isa v30.44, AdvSIMD v27.08, pseudocode v8.5-2019-06_rc2-5-g22901f2, sve v2019-06_rc4
; Build timestamp: 2019-06-26T22:3004
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