Compaq ECQD2KCTE manual Digital Unix

6.5	PALcode Effects on System Code	6–3
6.6	PALcode Replacement	6–3
6.7	Required PALcode Instructions	6–4
6.7.1	Drain Aborts	6–6
6.7.2	Halt	6–7
6.7.3	Instruction Memory Barrier	6–8

7Console Subsystem Overview

8Input/Output Overview

9OpenVMS Alpha

	9.1	Unprivileged OpenVMS Alpha PALcode	9–1
	9.2	Privileged OpenVMS Alpha Palcode	9–8
10	Digital UNIX
	10.1	Unprivileged Digital UNIX PALcode	10–1
	10.2	Privileged Digital UNIX PALcode	10–2
11	Windows NT Alpha
	11.1	Unprivileged Windows NT Alpha PALcode	11–1
	11.2	Privileged Windows NT Alpha PALcode	11–2
A	Software Considerations
	A.1	Hardware-Software Compact	A–1
	A.2	Instruction-Stream Considerations	A–2
	A.2.1	Instruction Alignment	A–2
	A.2.2	Branch Prediction and Minimizing Branch-Taken — Factor of 3	A–2
	A.2.3	Improving I-Stream Density — Factor of 3	A–4
	A.2.4	Instruction Scheduling — Factor of 3	A–4
	A.3	Data-Stream Considerations	A–4
	A.3.1	Data Alignment — Factor of 10	A–4
	A.3.2	Shared Data in Multiple Processors — Factor of 3	A–5
	A.3.3	Avoiding Cache/TB Conflicts — Factor of 1	A–6
	A.3.4	Sequential Read/Write — Factor of 1	A–8
	A.3.5	Prefetching — Factor of 3	A– 8
	A.4	Code Sequences	A–9
	A.4.1	Aligned Byte/Word (Within Register) Memory Accesses	A–9
	A.4.2	Division	A–10
	A.4.3	Byte Swap	A–11
	A.4.4	Stylized Code Forms	A–11
	A.4.4.1	NOP	A–11
	A.4.4.2	Clear a Register	A–12
	A.4.4.3	Load Literal	A–12
	A.4.4.4	Register-to-Register Move	A–13
	A.4.4.5	Negate	A–13

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