Grouping Rules And Stalls; Introduction - Sun Microsystems UltraSPARC-I User Manual

Grouping Rules and Stalls

17.1 Introduction

The chapter explains in detail how to group instructions to obtain maximum
throughput in UltraSPARC. The following subsections explain the formatting
conventions that make it easier to understand this information.
17.1.1 Textual Conventions
Rules are presented that consider instructions in three different ways:
Instructions:
Actual SPARC-V9 and UltraSPARC machine instructions. Instructions are
always written in
(Floating-point multiply double to quad — SPARC-V9)
•
FdMULq
• (Load Double Floating-Point Register — SPARC-V9)
LDDF
•
SHUTDOWN
Instruction Families:
Groups of related SPARC-V9 instructions, introduced (but not described) in The
SPARC Architecture Manual, Version 9. Instruction families are always written in
Mixed Case Bold Face Body Font
• (Branch on Integer Condition Codes with Prediction)
BPcc
— Consists of the following instructions:
,
BPGE
.
BPVS
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Mixed Case BODY FONT
(Power Down Support — UltraSPARC)
. Examples are:
, , , ,
BPGU BPL BPLE BPLEU
. Examples are:
, , , BPE,
BPA BPCC BPCS
, , ,
BPN BPNE BPNEG BPPOS
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,
BPG
, , and
BPVC
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