TTEST

Test transaction state

This instruction writes the depth of the transaction to the destination register, or the value 0 otherwise.

Encoding: System

Variants: FEAT_TME (ARMv9.0)

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	1	0	0	0	1	1	0	0	1	1	0	0	0	1	0	1	1
													op1			CRn				CRm				op2			Rt

TTEST <Xt>

Decoding algorithm

if !IsFeatureImplemented(FEAT_TME) then EndOfDecode(Decode_UNDEF);
constant integer t = UInt(Rt);

Operation

if !IsTMEEnabled() then UNDEFINED;

X[t, 64] = (TSTATE.depth)<63:0>;

Explanations

<Xt>: Is the 64-bit name of the general-purpose destination register, encoded in the "Rt" field.