AXFLAG

Convert floating-point condition flags from Arm to external format

This instruction converts the state of the PSTATE.{N,Z,C,V} flags from a form representing the result of an Arm floating-point scalar compare instruction to an alternative representation required by some software.

Encoding: System

Variants: FEAT_FlagM2 (ARMv8.5)

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	1	0	1	0	1	0	1	0	0	0	0	0	0	0	0	0	1	0	0	(0)	(0)	(0)	(0)	0	1	0	1	1	1	1	1
													op1							CRm				op2			Rt

AXFLAG

Decoding algorithm

if !IsFeatureImplemented(FEAT_FlagM2) then EndOfDecode(Decode_UNDEF);

Operation

constant bit z = PSTATE.Z OR PSTATE.V;
constant bit c = PSTATE.C AND NOT(PSTATE.V);

PSTATE.<N,Z,C,V> = '0' : z : c : '0';

Explanations