Bug 115

Summary:	SIMD ALUs needed
Product:	Libre-SOC's first SoC	Reporter:	Luke Kenneth Casson Leighton <lkcl>
Component:	ALU (including IEEE754 16/32/64-bit FPU)	Assignee:	Luke Kenneth Casson Leighton <lkcl>
Status:	CONFIRMED ---
Severity:	enhancement	CC:	libre-soc-bugs
Priority:	---
Version:	unspecified
Hardware:	PC
OS:	Linux
URL:	https://libre-soc.org/3d_gpu/architecture/dynamic_simd/
See Also:	https://bugs.libre-soc.org/show_bug.cgi?id=458 https://bugs.libre-soc.org/show_bug.cgi?id=467 https://bugs.libre-soc.org/show_bug.cgi?id=132 https://bugs.libre-soc.org/show_bug.cgi?id=167 https://bugs.libre-soc.org/show_bug.cgi?id=176 https://bugs.libre-soc.org/show_bug.cgi?id=549 https://bugs.libre-soc.org/show_bug.cgi?id=384 https://bugs.libre-soc.org/show_bug.cgi?id=594 https://bugs.libre-soc.org/show_bug.cgi?id=596 https://bugs.libre-soc.org/show_bug.cgi?id=713 https://bugs.libre-soc.org/show_bug.cgi?id=707 https://bugs.libre-soc.org/show_bug.cgi?id=709
NLnet milestone:	---	total budget (EUR) for completion of task and all subtasks:	0
budget (EUR) for this task, excluding subtasks' budget:	0	parent task for budget allocation:
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Bug Depends on:	1024, 101, 132
Bug Blocks:	116, 48

Description Luke Kenneth Casson Leighton 2019-07-25 15:37:39 BST

SIMD back-end operations are needed, using the ReservationStation
infrastructure.  it would be nice to still be able to do early-out.
will need unary selection and cancellation done, first.

Comment 1 Luke Kenneth Casson Leighton 2021-10-02 17:33:13 BST

with PartitionedSignal in place, the idea here is to have a Stage API
class which automatically understands and carries the Partition Context
throughout all pipelines.

the IO Data (as defined by regspecs) is then *automatically* allocated
PartitionedSignals rather than scalar Signals and thus the ALUs, comprising
as they do of Stage API pipelines, do not need massive intrusive conversion.

a wrapper around nmigen dsl.Module can then allocate PartitionedSignals.

however this should not be "all-in", it should be dynamic runtime configureable
as to whether the ALU should be instantiated as scalar or as SIMD.