Arm VERSION 1.2 Manual do Utilizador descarregar pdf (Página 98)

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Assembler Reference

3.6.3 Numeric expressions

Numeric expressions consist of combinations of numeric constants, numeric variables,

ordinary numeric literals, binary operators, and parentheses. See:

• Numeric constants on page 3-13

• Variables on page 3-13

• Numeric literals on page 3-21

• Binary operators on page 3-28

• SETA, SETL, and SETS on page 7-7.

Numeric expressions can contain register-relative or program-relative expressions if the

overall expression evaluates to a value that does not include a register or the program

counter.

Numeric expressions evaluate to 32-bit integers. You can interpret them as unsigned

numbers in the range 0 to 2

– 1, or signed numbers in the range –2

to 2

– 1.

However, the assembler makes no distinction between –n and 2

– n. Relational

operators such as >= use the unsigned interpretation. This means that 0 > –1 is

{FALSE}

Example

a SETA 256*256 ; 256*256 is a numeric expression

MOV r1,#(a*22) ; (a*22) is a numeric expression

1 2 ... 93 94 95 96 97 98 99 100 101 102 103 ... 359 360

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Arm VERSION 1.2 Manual do Utilizador Página 98

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