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Flexible second operand (Operand2)
Operand2 as a constant
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IT
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MOV32 pseudo--instruction
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NEG pseudo-instruction
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RFE
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SEL
SETEND
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SMC
NOP
SMLAD and SMLSD
SMLALxy
SMLALD and SMLSLD
SMMUL, SMMLA, and SMMLS
SMUAD{X} and SMUSD{X}
SMULxy and SMLAxy
SMULWy and SMLAWy
SRS
SSAT and USAT
SSAT16 and USAT16
SUBS pc, lr
SVC
SWP and SWPB
SXT, SXTA, UXT, and UXTA
SYS
TBB and TBH
TST and TEQ
UMULL, UMLAL, SMULL, and SMLAL
UMAAL
UND pseudo-instruction
USAD8 and USADA8
VFP Programming
Directives Reference
Operand2 as a constant
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You specify an Operand2 constant in the form:
#constant
where constant
In ARM instructions, constant
In Thumb instructions, constant
any constant that can be produced by shifting an 8-bit value left by any number of bits within a 32-bit word
any constant of the form
0x00XY00XYany constant of the form
0xXY00XY00any constant of the form
0xXYXYXYXY.
Note
In the constants shown above, X and Y are
hexadecimal digits.
In addition, in a small number of instructions, constant
When an Operand2 constant is used with the instructions MOVS, MVNS, ANDS, ORRS, ORNS, EORS, BICS, TEQ or TST,
the carry flag is updated to bit[31] of the constant, if the constant
is greater than 255 and can be produced by shifting an 8-bit value.
These instructions do not affect the carry flag if Operand2 is any
other constant.
Instruction substitutionIf a value of constantconstant
For example, an assembler might assemble the instruction CMP Rd#0xFFFFFFFE as
the equivalent instruction CMN Rd#0x2.
Be aware of this when comparing disassembly listings with source code.
You can use the --diag_warning 1645 assembler
command line option to check when an instruction substitution occurs.
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