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Title: XLS backend by vasdommes · Pull Request #1475 · fastmachinelearning/hls4ml · GitHub

Open Graph Title: XLS backend by vasdommes · Pull Request #1475 · fastmachinelearning/hls4ml

X Title: XLS backend by vasdommes · Pull Request #1475 · fastmachinelearning/hls4ml

Description: Machine learning on FPGAs using HLS. Contribute to fastmachinelearning/hls4ml development by creating an account on GitHub.

Open Graph Description: Description This PR adds XLS backend. It is based on PR #1343, with most of the code rewritten and new features added. Google XLS is an open-source (Apache 2) High Level Syntesis toolchain that pro...

X Description: Description This PR adds XLS backend. It is based on PR #1343, with most of the code rewritten and new features added. Google XLS is an open-source (Apache 2) High Level Syntesis toolchain that pro...

Opengraph URL: https://github.com/fastmachinelearning/hls4ml/pull/1475

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og:image:altDescription This PR adds XLS backend. It is based on PR #1343, with most of the code rewritten and new features added. Google XLS is an open-source (Apache 2) High Level Syntesis toolchain that pro...
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Commits118 (118)https://github.com/fastmachinelearning/hls4ml/pull/1475/commits
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XLS backendhttps://github.com/fastmachinelearning/hls4ml/pull/1475#top
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https://github.com/vasdommes
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May 14, 2026https://github.com/fastmachinelearning/hls4ml/pull/1475#issue-4448606060
Please reload this pagehttps://github.com/fastmachinelearning/hls4ml/pull/1475
#1343https://github.com/fastmachinelearning/hls4ml/pull/1343
Google XLShttps://google.github.io/xls/
DSLXhttps://google.github.io/xls/dslx_reference/
XLS IRhttps://google.github.io/xls/ir_overview/
Optimizedhttps://google.github.io/xls/optimizations/optimizations/
(System)Veriloghttps://google.github.io/xls/codegen_options/
removedhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/ed74aff263a9f31f62ffb9d74ec9ddd8c81e621b
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@calad0ihttps://github.com/calad0i
test_softmax.py does not test argmax and latency implementations; latency fails #1443https://github.com/fastmachinelearning/hls4ml/issues/1443
Addedhttps://github.com/vasdommes/hls4ml/commit/2ec9ef35e9b30c0a6c30132a4f2e84e9d4c86b36#diff-e5cc32b6085fc8e732ef06de16c8d1f6ba56688906f9a6f70bd4d6c2932d2d65R824-R828
Updatedhttps://github.com/vasdommes/hls4ml/commit/878df2402da0fa223e589479e2e5d3cb8dec58a4
xls-pythonhttps://calad0i.github.io/pyxls/
DSLX standard libraryhttps://google.github.io/xls/dslx_std/
test_pytorch_api.py/test_squeezehttps://github.com/vasdommes/hls4ml/blob/2425a5ff76906287f719bf41f0e7f1142265253a/test/pytest/test_pytorch_api.py#L653
test_keras_api.py/test_conv2dhttps://github.com/vasdommes/hls4ml/blob/70c7b7bab5c8e6b3080bfd44efcd07635405bb66/test/pytest/test_keras_api.py#L240
8578a62https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/8578a62eb17a3b08d1aea0f047d33ca480b7f930
75a04fbhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/75a04fb6ce3639f146d46f42002b12d528384276
guidelines for contributinghttps://github.com/fastmachinelearning/hls4ml/blob/main/CONTRIBUTING.md
Please reload this pagehttps://github.com/fastmachinelearning/hls4ml/pull/1475
Girjoabahttps://github.com/Girjoaba
July 16, 2025 18:04https://github.com/fastmachinelearning/hls4ml/pull/1475#commits-pushed-f88faa0
https://github.com/Girjoaba
init: xls backend (not working), implemented xls specific layer infor…https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/f88faa0093579ed722ea30ce0f89529ede32acfa
f88faa0https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/f88faa0093579ed722ea30ce0f89529ede32acfa
https://github.com/Girjoaba
testhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/4496252db8164036379504268d9db2dba9b6c3d3
4496252https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/4496252db8164036379504268d9db2dba9b6c3d3
https://github.com/Girjoaba
feat: loading weights and creating infrastructure added to writerhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/d8b2415e8d52ee304a674dd54a4a4cb011891176
d8b2415https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/d8b2415e8d52ee304a674dd54a4a4cb011891176
https://github.com/Girjoaba
feat: init writer completehttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/fbe2e8295aec67cd775087f9e42b832b8595d2f3
fbe2e82https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/fbe2e8295aec67cd775087f9e42b832b8595d2f3
https://github.com/Girjoaba
feat: first end2end working testhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/f9b28634e703742d1e3f9d966c1198b147b34e35
f9b2863https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/f9b28634e703742d1e3f9d966c1198b147b34e35
https://github.com/Girjoaba
fix: vector input support, change back to current directoryhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/0952f1bac0f46eea2246031f687c41a4611dd504
0952f1bhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/0952f1bac0f46eea2246031f687c41a4611dd504
https://github.com/Girjoaba
refactoring: predict function callhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/b32405b55740302a16de13631315e53d74dad111
b32405bhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/b32405b55740302a16de13631315e53d74dad111
https://github.com/Girjoaba
feat: solo relu activation test passhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/6d9166650d9274603cfbbc84fe98337f9fe4009d
6d91666https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/6d9166650d9274603cfbbc84fe98337f9fe4009d
https://github.com/Girjoaba
debt cleanup: split dslx templates in multiple fileshttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/86dd94acfb4d9b92de6efa199dbfc1100743be2f
86dd94ahttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/86dd94acfb4d9b92de6efa199dbfc1100743be2f
https://github.com/Girjoaba
refactoring: simplified writer -> attribute factory written as an opt…https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/0b9ad5714beff6d511cfae932cfa6541076fd842
0b9ad57https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/0b9ad5714beff6d511cfae932cfa6541076fd842
https://github.com/Girjoaba
feat: softmax xls implementation of table lookuphttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/a78bd1b452adbb539494a521bc3071926f96426c
a78bd1bhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/a78bd1b452adbb539494a521bc3071926f96426c
https://github.com/Girjoaba
integrated strategies for the softmax implementationhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/b24e5811f2110929b96344332b123662b2ede48d
b24e581https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/b24e5811f2110929b96344332b123662b2ede48d
https://github.com/Girjoaba
bugfix: softmax latency implementationhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/039c514c607e29abedc481c86c03f88a302e49b8
039c514https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/039c514c607e29abedc481c86c03f88a302e49b8
https://github.com/Girjoaba
cleanup: removed junk filehttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/dc8f5a9853ecb0fa998977f06f9763017d5c611d
dc8f5a9https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/dc8f5a9853ecb0fa998977f06f9763017d5c611d
https://github.com/Girjoaba
feat: stable softmax 1 specific precision workinghttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/248c0f02379a8815720622cce36cde3e69127acd
248c0f0https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/248c0f02379a8815720622cce36cde3e69127acd
https://github.com/Girjoaba
cleanup: removed junkhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/4ff3f949e5b1e5a1b1f6309e3c5769fa67a6a92a
4ff3f94https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/4ff3f949e5b1e5a1b1f6309e3c5769fa67a6a92a
https://github.com/Girjoaba
feat: integrated stable softmax with all layershttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/9a73968dd7d0a739b76a119a14469a3bdb16b2cc
9a73968https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/9a73968dd7d0a739b76a119a14469a3bdb16b2cc
https://github.com/Girjoaba
feat: softmax stable and argmax working any bit precision combinationhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/5684d260da6e5c805ca3cfe5ab76c9bfd9fd7d5b
5684d26https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/5684d260da6e5c805ca3cfe5ab76c9bfd9fd7d5b
https://github.com/Girjoaba
feat: xls utilization report parsing with vivadohttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/ff02a021f8439c3b2da297822f049dbaa73d15f1
ff02a02https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/ff02a021f8439c3b2da297822f049dbaa73d15f1
https://github.com/Girjoaba
wip: cnnhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/c6a9ccdd1cc19f94f2c5c5d145aeb1382761cf83
c6a9ccdhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/c6a9ccdd1cc19f94f2c5c5d145aeb1382761cf83
https://github.com/Girjoaba
feat: prepared writer weights for CNNshttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/81af6b630cbb86d80781f81088eab623996cc104
81af6b6https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/81af6b630cbb86d80781f81088eab623996cc104
https://github.com/Girjoaba
feat: conv2d_latency is now code generatedhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/5c42f5c1ba54944e02980d2ae14abe81e86d38b1
5c42f5chttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/5c42f5c1ba54944e02980d2ae14abe81e86d38b1
https://github.com/Girjoaba
reverted look_up tableshttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/092a809e022b1f3157476039903aa263d6430ee5
092a809https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/092a809e022b1f3157476039903aa263d6430ee5
https://github.com/Girjoaba
feat: timing report when building the projecthttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/90c3231b2138eed6173316caac28ca69f96532d4
90c3231https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/90c3231b2138eed6173316caac28ca69f96532d4
https://github.com/vasdommes
Fix input type for top function in DSLXhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/a7fbae35001141dff78ffb8a0c2d66f6eb3c6d01
a7fbae3https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/a7fbae35001141dff78ffb8a0c2d66f6eb3c6d01
https://github.com/vasdommes
Add fix_softmax_table_size to XLS optimization passeshttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/9e7afe0504f0ddad69b34aa16a2a3bf72b0dd2e8
9e7afe0https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/9e7afe0504f0ddad69b34aa16a2a3bf72b0dd2e8
https://github.com/vasdommes
Merge remote-tracking branch 'refs/remotes/origin/main' into xls_backendhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/912e6cc05d6d68c9d2e168eb4105a3163d9b6166
912e6cchttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/912e6cc05d6d68c9d2e168eb4105a3163d9b6166
https://github.com/vasdommes
Fix after merge: remove get_shape() and dim names from XLS.https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/a5cccbe0b783c224b4e576a1a03db7b18b7202e7
a5cccbehttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/a5cccbe0b783c224b4e576a1a03db7b18b7202e7
fastmachinelearning#1321https://github.com/fastmachinelearning/hls4ml/pull/1321
https://github.com/vasdommes
Fix test_softmax.py: replace 'strategy' with 'implementation'https://github.com/fastmachinelearning/hls4ml/pull/1475/commits/b689c7baf4c8243b7fb577876224b89bc6cfcf6d
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Merge branch 'main' into xls_backendhttps://github.com/fastmachinelearning/hls4ml/pull/1475/commits/b1aa5d0dd8ac2e2a615be3c0c0f28961991107fb
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