Operator Precedence. Freescale Semiconductor sc100

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Expressions

Operator Precedence

Table 3.2 Assembler Operators ( continued)

Type

Logical

Operator

&&

||

Description

Logical AND — Returns integer 1 if both operands are nonzero; otherwise returns integer 0.

Logical OR — Returns integer 1 if either operand is nonzero; otherwise returns integer 0.

Operator Precedence

The assembler evaluates expressions from left to right, following these rules of operator precedence:

1. Parenthetical expression (innermost first)

2. Unary plus, unary minus, one’s complement, logical negation

3. Multiplication, division, mod

4. Addition, subtraction

5. Shift

6. Relational operators: less, less or equal, greater, greater or equal

7. Relational operators: equal, not equal

8. Bitwise AND, OR, exclusive OR

9. Logical AND, OR

Valid operands include numeric constants, literal ASCII strings, and symbols.

You cannot apply the one’s complement, shift, or bitwise operators to floating-point operands. That is, if an expression evaluation results in a floating-point value on either side of any such operator, the assembler generates an error message.

Functions

The assembler’s built-in functions support data conversion, string comparison, and transcendental math computations. You may use functions as terms in any arbitrary expression; functions may have no arguments, one argument, or multiple arguments.

These rules apply:

• Open and close parentheses must always follow functions.

• Arguments that are expressions must be absolute expressions, except where noted.

• Arguments must not contain external references.

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Expressions

Functions

• There must not be intervening spaces between the function name and the open parenthesis, or between comma-separated arguments.

Table 3.3 lists the assembler functions of each type:

Table 3.3 Assembler Function List

Type Function

Mathematical ABS — Absolute value

ACS — Arc cosine

ASN — Arc sine

AT2 — Arc tangent

ATN — Arc tangent

CEL — Ceiling

COH — Hyperbolic cosine

COS — Cosine

FLR — Floor

L10 — Log base 10

LOG — Natural logarithm

MAX — Maximum value

MIN — Minimum value

POW — Raise to power

RND — Random value

SGN — Return sign

SIN — Sine

SNH — Hyperbolic sine

SQT — Square root

TAN — Tangent

TNH — Hyperbolic tangent

XPN — Exponential function

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Expressions

Functions

Table 3.3 Assembler Function List ( continued)

Type

Conversion

String

Macro

Assembler

Mode

Function

CVF — Convert Integer to floating point

CVI — Convert floating point to integer

CVS — Convert Memory space

FLD — Shift and mask

FRC — Convert floating point to fractional

LFR — Convert floating point to long fractional

LNG — Concatenate to double word

LUN — Convert long fractional to floating point

RVB — Reverse bits in field

UNF — Convert fractional to floating point

LEN — String length

POS — Position of substring

SCP — Compare strings

ARG — Macro argument

CNT — Macro argument count

MAC — Macro definition

MXP — Macro expansion

BIGENDIAN — Endian mode check

CCC — Cumulative cycle count

CHK — Instruction/data checksum

CTR — Location counter number

DEF — Defined symbol

EXP — Expression check

INT — Integer check

LCV — Location counter value

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