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icache: support early refill forwarding and lookups on refill #714

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icache: support early refill forwarding and lookups on refill #714

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Closes #286

piotro888 added 3 commits June 25, 2024 22:56
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WIP
d912e39
@piotro888
Remove comb forward
69fc8a9 
- result would be available in the same cycle as on bus.
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Error handling & flush
9d0bfea
@piotro888 piotro888 added optimization This is *just* an optimization! benchmark Benchmarks should be run for this change and removed benchmark Benchmarks should be run for this change labels Jun 25, 2024
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Benchmarks summary

Performance benchmarks

aha-mont64 crc32 minver nettle-sha256 nsichneu slre statemate ud
0.418 0.513 0.338 0.656 0.369 0.29 0.327 0.433

You can view all the metrics here.

Synthesis benchmarks (basic)

Device utilisation: (ECP5) LUTs used as DFF: (ECP5) LUTs used as carry: (ECP5) LUTs used as ram: (ECP5) Max clock frequency (Fmax)
21850 6009 802 976 49

Synthesis benchmarks (full)

Device utilisation: (ECP5) LUTs used as DFF: (ECP5) LUTs used as carry: (ECP5) LUTs used as ram: (ECP5) Max clock frequency (Fmax)
37472 9421 1944 1156 39

@kuznia-rdzeni kuznia-rdzeni deleted a comment from github-actions bot Jun 25, 2024
@piotro888 piotro888 force-pushed the piotro/icache-refill-lookup branch from db1ad43 to cdbd1b0 Compare June 25, 2024 22:57
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Benchmarks summary

Performance benchmarks

aha-mont64 crc32 minver nettle-sha256 nsichneu slre statemate ud
0.418 0.513 0.338 0.656 0.371 0.29 0.327 0.433

You can view all the metrics here.

Synthesis benchmarks (basic)

Device utilisation: (ECP5) LUTs used as DFF: (ECP5) LUTs used as carry: (ECP5) LUTs used as ram: (ECP5) Max clock frequency (Fmax)
25675 6172 770 976 51

Synthesis benchmarks (full)

Device utilisation: (ECP5) LUTs used as DFF: (ECP5) LUTs used as carry: (ECP5) LUTs used as ram: (ECP5) Max clock frequency (Fmax)
29543 9417 1976 1152 35

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benchmark Benchmarks should be run for this change optimization This is *just* an optimization!
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Instruction cache doesn't do lookups while refilling
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