Inside Macintosh: PowerPC Numerics / Part 3 - Numerics in PowerPC Assembly Language

Chapter 13 - Assembly-Language Numeric Conversions

This chapter describes how you can use PowerPC assembly-language instructions to perform the conversions required by the IEEE standard (described in Chapter 5, "Conversions"). The assembler provides instructions that perform many of these conversions. The conversion instructions have two operands, both of which are floating-point registers. They are of the form

instr DST, SRC

and are interpreted as

DST \xC6 op SRC

where SRC and DST are floating-point registers and op is some operation.

For each type of conversion, this chapter lists the assembly-language instructions you can use to perform that conversion and gives an example of how to use the instructions.

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Chapter Contents

Conversions From Integer to Floating-Point Formats

Conversions From Floating-Point to Integer Formats

Conversions From Single to Double Format

Conversions From Double to Single Format