* [libre-riscv-dev] [Bug 338] New: CompUnitALU needs go_die to be wired to ALU shadow mask
@ 2020-05-22 16:16 bugzilla-daemon
2020-05-22 16:17 ` [libre-riscv-dev] [Bug 338] " bugzilla-daemon
0 siblings, 1 reply; 2+ messages in thread
From: bugzilla-daemon @ 2020-05-22 16:16 UTC (permalink / raw)
To: libre-riscv-dev
https://bugs.libre-soc.org/show_bug.cgi?id=338
Bug ID: 338
Summary: CompUnitALU needs go_die to be wired to ALU shadow
mask
Product: Libre-SOC's first SoC
Version: unspecified
Hardware: PC
OS: Mac OS
Status: CONFIRMED
Severity: enhancement
Priority: ---
Component: Source Code
Assignee: lkcl@lkcl.net
Reporter: lkcl@lkcl.net
CC: libre-riscv-dev@lists.libre-riscv.org
NLnet milestone: ---
this is for ALU cancellation. when go_die is pulled on a Comp Unit, it
indicates
that the result - computed or in transit to *be* computed - is no longer
required
and must be dropped on the floor, immediately.
ALU pipelines are to be set up with "cancellation" capability. this is set
from nmutil.concurrentunit.ReservationStations "maskwid" parameter, which is
set one per CompUnit. with the cancellation mask being N bits wide,
N go_die CompUnits may be connected together on the front, one go_die signal
to each cancellation mask bit.
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2020-05-22 16:16 [libre-riscv-dev] [Bug 338] New: CompUnitALU needs go_die to be wired to ALU shadow mask bugzilla-daemon
2020-05-22 16:17 ` [libre-riscv-dev] [Bug 338] " bugzilla-daemon
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