B.cond

Branch conditionally

This instruction branches conditionally to a label at a PC-relative offset. This instruction provides a hint that this is not a subroutine call or return.

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
0	1	0	1	0	1	0	0	imm19																			0	cond
																											o0

Encoding

B.<cond> <label>

Decode

let offset : bits(64) = SignExtend{}(imm19::'00'); let condition : bits(4) = cond;

Assembler Symbols

<cond>

Is one of the standard conditions, encoded in the standard way, and encoded in cond:

cond	<cond>
0000	EQ
0001	NE
0010	CS\|HS
0011	CC\|LO
0100	MI
0101	PL
0110	VS
0111	VC
1000	HI
1001	LS
1010	GE
1011	LT
1100	GT
1101	LE
1110	AL
1111	NV

<label>

Is the program label to be conditionally branched to. Its offset from the address of this instruction, in the range +/-1MB, is encoded as "imm19" times 4.

Operation

let branch_conditional : boolean = TRUE; if ConditionHolds(condition) then BranchTo{64}(PC64() + offset, BranchType_DIR, branch_conditional); else BranchNotTaken(BranchType_DIR, branch_conditional); end;

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