Instruction Set Summary - Motorola MPC750 User Manual

Table 2-21 summarizes the mode behavior for results.
Table 2-21. Floating-Point Result Data Type Behavior
Precision Data Type IEEE Mode (NI
=
0) Non-IEEE Mode (NI
=
1)
Single Denormalized Return single-precision denormalized number Return zero.
with trailing zeros.
Single Normalized,
Return the result.
Return the result.
infinity, zero
Single QNaN,SNaN
Return QNaN. Return QNaN.
Single INT Place integer into low word of FPR. If (Invalid Operation)
then
Place (Ox8000) into FPR[32-63]
else
Place integer into FPR[32-63].
Double Denormalized Return double-precision denormalized number. Return zero.
Double Normalized, Return the result. Return the result.
infinity, zero
Double QNaN, SNaN Return QNaN. Return QNaN.
Double INT
Not supported by MPC750 Not supported by MPC750
2.3 Instruction Set Summary
This chapter describes instructions and addressing modes defined for the MPC750. These
instructions are divided into the following functional categories:
• Integer instructions-These include arithmetic and logical instructions. For more
information, see Section 2.3.4.1, "Integer Instructions."
• Floating-point instructions-These include floating-point arithmetic instructions, as
well as instructions that affect the floating-point status and control register (FPSCR).
For more information, see Section 2.3.4.2, "Floating-Point Instructions."
• Load and store instructions-These include integer and floating-point load and store
instructions. For more information, see Section 2.3.4.3, "Load and Store
Instructions."
• Flow control instructions-These include branching instructions, condition register
logical instructions, trap instructions, and other instructions that affect the
instruction flow. For more information, see Section 2.3.4.4, "Branch and Flow
Control Instructions."
• Processor control instructions-These instructions are used for synchronizing
memory accesses and managing caches, TLBs, and segment registers. For more
information, see Section 2.3.4.6, "Processor Control Instructions-UISA,"
Section 2.3.5.1, "Processor Control Instructions-VEA," and Section 2.3.6.2,
"Processor Control Instructions-OEA."
Chapter 2. MPC750 Processor Programming Model
2-31