ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Assembler syntax
TST , {,}
where:
See Standard assembler syntax fields on page A8-7.
The first operand register.
The register that is optionally shifted and used as the second operand.
Instruction Details
The shift to apply to the value read from . If present, encoding T1 is not permitted. If
absent, no shift is applied and all encodings are permitted. Shifts applied to a register on
page A8-10 describes the shifts and how they are encoded.
Operation
if ConditionPassed() then
EncodingSpecificOperations();
(shifted, carry) = Shift_C(R[m], shift_t, shift_n, APSR.C);
result = R[n] AND shifted;
APSR.N = result;
APSR.Z = IsZeroBit(result);
APSR.C = carry;
// APSR.V unchanged
Exceptions
None.
ARM DDI 0406B Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. A8-457