Texas Instruments TMS34010 User Manual

The TMS34010 C Language
4.7.4 Enumeration Declarations
Addi-
tional
Enumerations allow the use of named integer constants in TMS34010 C. The
syntax
of an enumeration declaration is very similar to that of a structure or
union. The keyword enum is substituted for struct or union, and a list of enu-
merators
is substituted for the list of members.
Enumeration declarations have a
"tag", as do structure and union declarations.
This tag may be used in future declarations,
without repeating the entire dec-
laration.
The list
of enumerators is simply a comma-separated list of identifiers. Each
identifier may be either alone or followed by an equal sign and an integer
constant.
If no enumerators with "=" appear, then the values of the successive
enumerators begin at zero and increase
by one for each identifier. An identifier
with an assigned value assumes that value, -and subsequent enumerators
continue
counting by one from there. The assigned value may be negative,
but counting still continues by positive one.
An object
of type enum has a size determined as follows: if any of the object's
enumerators have negative values, the object occupies
32 bits. Otherwise, the
object occupies the minimum number
of bits required to represent the largest
enumerator value
and is considered to be unsigned.
Unlike structure and union members, enumerators share their name space
with
ordinary variables and, therefore, must not conflict with variables or other en-
umerators in the same scope.
Enumerators may appear wherever integer constants are required
and, there-
fore, can participate in arithmetic expressions, case expressions, and so forth.
In addition, explicit integer expressions may be assigned to variables of type
enum. The compiler does no range checking
to insure the value will fit in the
enumeration field. The compiler does, however, issue a warning message
if
an enumerator of one type is assigned to a variable of another.
Example:
enum color (red,blue,green=10,orange,purple=-2,cyan} x;
This statement declares x as a variable of type enum The enumerators (with
their values in parentheses) are: red (0), blue (1), green (10), orange (11),
purple (-2), cyan (-1). The variable x is allocated 32 bits because of the ne-
gative values.
All the following are legal operations:
x = blue;
x = blue + red;
x 100;
ired; /*assume i has been declared an int*/
x = i + cyan;
4-7

Texas Instruments TMS34010 Specifications

General

Manufacturer	Texas Instruments
Model	TMS34010
Data Bus Width	32-bit
Operating Voltage	5 V
Year Introduced	1986
Category	Graphics Processor Unit (GPU)
Clock Speed	40 MHz (Maximum)
Instruction Set	Custom
Graphics Capabilities	2D graphics
Package	PGA
Resolution Support	up to 1024x768
Architecture	32-bit RISC

Summary

TMS34010 C Compiler Package Product Overview

Applicable Documents

Lists related Texas Instruments and C programming publications.

Documentation Conventions

Explains symbols and formatting used in the guide.

TMS34010 C Compiler Package Installation

Installation for Texas Instruments and IBM PC Systems

Details installation steps for PC systems, including hardware requirements and diskette usage.

VAX/VMS Systems Installation

Covers tape mounting, VMS commands, and setup for VAX/VMS.

VAX/ULTRIX and VAX/UNIX System V Installation

Outlines tape installation and tool verification for ULTRIX and UNIX systems.

Invocation and Operation of the TMS34010 C Compiler

The TMS34010 C Preprocessor (GSPCPP)

Describes GSPCPP's role in macro processing, include files, and conditional compilation.

The TMS34010 Parser (GSPCC)

Explains GSPCC's function in syntax checking and generating intermediate files.

The Code Generator (GSPCG)

Details GSPCG's process of converting intermediate code to assembly source.

Batch Execution of the C Compiler

Explains how to use GSPC.BAT for compiling and assembling C programs.

Linking a C Program

Covers modular code linking, object libraries, and the role of the linker.

The TMS34010 C Language

Identifiers and Keywords

Discusses identifier significance, case sensitivity, and new keywords.

TMS34010 C Data Types

Details basic and derived data types, including enum and void.

Structure and Union Declarations

Explains alignment, bit fields, and member name rules for structures and unions.

Enumeration Declarations

Describes the syntax and usage of named integer constants (enumerations).

TMS34010 C Run-Time Environment

Memory Model

Describes memory organization, including code and data placement.

Register Conventions

Outlines register usage for stack management, function calls, and general operations.

Function Call Conventions

Details how functions pass arguments, handle return values, and manage the stack.

System Initialization

Explains the creation and initialization of the C run-time environment, including stacks.

TMS34010 Run-Time Support

Memory Management

Describes C dynamic memory management routines like malloc, calloc, and free.

String Functions

Lists and describes functions for string manipulation, search, and comparison.

Character Typing and Conversion Macros

Explains macros for identifying character types and converting between cases.

Fatal Errors

Compiler Error Messages

Describes the format and common fatal error messages from the compiler.

Floating Point Facility

Single-Precision Floating-Point Format

Details the 32-bit format for single-precision floating-point numbers.

Double-Precision Floating-Point Format

Details the 64-bit format for double-precision floating-point numbers.

Floating Point Conversions

Explains conversions between integer, float, and double types.

Floating-Point Error Exception Handling

Describes how to trap and handle floating-point errors using fp-error.