SPV_ALTERA_fpga_memory

Name Strings

SPV_ALTERA_fpga_memory_accesses

Contact

To report problems with this extension, please open a new issue at:

https://github.com/KhronosGroup/SPIRV-Registry

Contributors

Mohammad Fawaz, Intel
Joe Garvey, Intel
Michael Kinsner, Intel
Alexey Sotkin, Intel

Notice

Status

First draft

Version

Last Modified Date

2020-02-20

Revision

1

Dependencies

This extension is written against the SPIR-V Specification, Version 1.5 Revision 2.

This extension requires SPIR-V 1.0.

Overview

This extension adds decorations, useful for FPGA targets, that explicitly request that implementation of a memory access is configured in a certain way.

Extension Name

To use this extension within a SPIR-V module, the following OpExtension must be present in the module:

OpExtension "SPV_ALTERA_fpga_memory_accesses"

New capabilities

This extension introduces a new capability:

FPGAMemoryAccessesALTERA

New Decorations

Decorations added under the FPGAMemoryAccessesALTERA capability:

BurstCoalesceALTERA
CacheSizeALTERA
DontStaticallyCoalesceALTERA
PrefetchALTERA

Token Number Assignments

FPGAMemoryAccessesALTERA	5898
BurstCoalesceALTERA	5899
CacheSizeALTERA	5900
DontStaticallyCoalesceALTERA	5901
PrefetchALTERA	5902

Modifications to the SPIR-V Specification, Version 1.5

Decoration

Modify Section 3.20, Decoration, adding these rows to the Decoration table:

Decoration	Extra Operands	Enabling Capabilities
5899	BurstCoalesceALTERA Apply to a pointer. Request, to the extent possible, that a dynamic burst coalescer be implemented when the memory pointed to by the pointer is accessed using OpLoad or OpStore.		FPGAMemoryAccessesALTERA
5900	CacheSizeALTERA Apply to a pointer. Request, to the extent possible, that a read-only cache of the specified size be implemented when the memory pointed to by the pointer is accessed using OpLoad.	Literal Number Cache Size in bytes	FPGAMemoryAccessesALTERA
5901	DontStaticallyCoalesceALTERA Apply to a pointer. Request, to the extent possible, that accesses to the pointer, using OpLoad or OpStore, should not be statically coalesced with other memory accesses at compile time.		FPGAMemoryAccessesALTERA
5902	PrefetchALTERA Apply to a pointer. Request, to the extent possible, that a prefetcher of the specified size be implemented when the memory pointed to by the pointer is accessed using OpLoad.	Literal Number Prefetcher Size in bytes	FPGAMemoryAccessesALTERA

Decoration

Extra Operands

Enabling Capabilities

5899

BurstCoalesceALTERA
Apply to a pointer. Request, to the extent possible, that a dynamic burst coalescer be implemented when the memory pointed to by the pointer is accessed using OpLoad or OpStore.

FPGAMemoryAccessesALTERA

5900

CacheSizeALTERA
Apply to a pointer. Request, to the extent possible, that a read-only cache of the specified size be implemented when the memory pointed to by the pointer is accessed using OpLoad.

Literal Number
Cache Size in bytes

FPGAMemoryAccessesALTERA

5901

DontStaticallyCoalesceALTERA
Apply to a pointer. Request, to the extent possible, that accesses to the pointer, using OpLoad or OpStore, should not be statically coalesced with other memory accesses at compile time.

FPGAMemoryAccessesALTERA

5902

PrefetchALTERA
Apply to a pointer. Request, to the extent possible, that a prefetcher of the specified size be implemented when the memory pointed to by the pointer is accessed using OpLoad.

Literal Number
Prefetcher Size in bytes

FPGAMemoryAccessesALTERA

Capability

Modify Section 3.31, Capability, adding a row to the Capability table:

Capability	Implicitly Declares
5898	FPGAMemoryAccessesALTERA

Capability

Implicitly Declares

5898

FPGAMemoryAccessesALTERA

Validation Rules

None.

Issues

None.

Revision History

Rev	Date	Author	Changes
1	2020-02-20	Mohammad Fawaz	Initial public release

Rev

Date

Author

Changes

1

2020-02-20

Mohammad Fawaz

Initial public release