Simplify gen_matrix() and poly_rej_uniform_x4() #1112

rod-chapman · 2025-07-08T12:22:59Z

Simplify gen_matrix() and poly_rej_uniform_x4()

Simplify poly_rej_uniform_x4() API to explicitly take 4 objects to write, rather than a slice of a larger array.
Update gen_matrix() in light of that.
Update test/bench_components_mlkem.c

Proof time of poly_rej_uniform_x4() reduces from 20s to 9s on Apple M1.
Proof time of gen_matrix() unchanged at 8s

Runtime performance benchmarks show no significant change.

mlkem/src/indcpa.c

hanno-becker

@rod-chapman Can you elaborate on your motivation for making the change to poly_rej_uniform_x4()? Is it enabling further work? We should not spend time micro-optimizing proofs that are already acceptably fast (which 20s is to me).

rod-chapman · 2025-07-08T14:28:50Z

For me, it's just much more obviously correct this way. It removes the need to understand (and the reliance on) how arrays are laid out in memory and the need to write over more than one array element.

hanno-becker

The change of signature mlk_poly_rej_uniform_x4() is fine to me if it helps further experimentation on #906. Please revert the other unrelated change -- I think it's a micro-optimization that hinders readability.

rod-chapman · 2025-07-08T14:40:03Z

I will disagree-and-commit on this issue. Reverted, squashed, commit message updated, and pushed.

1. Simplify poly_rej_uniform_x4() API to explicitly take 4 objects to write, rather than a slice of a larger array. 2. Modify gen_matrix() in light of that. 3. Update test/bench_components_mlkem.c Signed-off-by: Rod Chapman <rodchap@amazon.com>

oqs-bot

Mac Mini (M1, 2020) benchmarks

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`12306` cycles	`12302` cycles	`1.00`
`ML-KEM-512 encaps`	`14704` cycles	`14894` cycles	`0.99`
`ML-KEM-512 decaps`	`19247` cycles	`19242` cycles	`1.00`
`ML-KEM-768 keypair`	`21360` cycles	`21359` cycles	`1.00`
`ML-KEM-768 encaps`	`23571` cycles	`23565` cycles	`1.00`
`ML-KEM-768 decaps`	`30139` cycles	`30141` cycles	`1.00`
`ML-KEM-1024 keypair`	`30353` cycles	`30338` cycles	`1.00`
`ML-KEM-1024 encaps`	`34539` cycles	`34661` cycles	`1.00`
`ML-KEM-1024 decaps`	`44338` cycles	`44158` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Intel Xeon 4th gen (c7i)

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`9693` cycles	`9671` cycles	`1.00`
`ML-KEM-512 encaps`	`10878` cycles	`10829` cycles	`1.00`
`ML-KEM-512 decaps`	`15067` cycles	`15038` cycles	`1.00`
`ML-KEM-768 keypair`	`16394` cycles	`16282` cycles	`1.01`
`ML-KEM-768 encaps`	`17495` cycles	`17358` cycles	`1.01`
`ML-KEM-768 decaps`	`23168` cycles	`23008` cycles	`1.01`
`ML-KEM-1024 keypair`	`21623` cycles	`21745` cycles	`0.99`
`ML-KEM-1024 encaps`	`23681` cycles	`23718` cycles	`1.00`
`ML-KEM-1024 decaps`	`31481` cycles	`31460` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Intel Xeon 4th gen (c7i) (no-opt)

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`28977` cycles	`28708` cycles	`1.01`
`ML-KEM-512 encaps`	`34410` cycles	`34633` cycles	`0.99`
`ML-KEM-512 decaps`	`44364` cycles	`44353` cycles	`1.00`
`ML-KEM-768 keypair`	`48316` cycles	`48085` cycles	`1.00`
`ML-KEM-768 encaps`	`56278` cycles	`55726` cycles	`1.01`
`ML-KEM-768 decaps`	`68193` cycles	`67492` cycles	`1.01`
`ML-KEM-1024 keypair`	`71819` cycles	`73152` cycles	`0.98`
`ML-KEM-1024 encaps`	`84168` cycles	`84937` cycles	`0.99`
`ML-KEM-1024 decaps`	`99666` cycles	`99269` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Arm Cortex-A72 (Raspberry Pi 4) benchmarks

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`52412` cycles	`52109` cycles	`1.01`
`ML-KEM-512 encaps`	`60198` cycles	`59857` cycles	`1.01`
`ML-KEM-512 decaps`	`76713` cycles	`76813` cycles	`1.00`
`ML-KEM-768 keypair`	`89158` cycles	`89346` cycles	`1.00`
`ML-KEM-768 encaps`	`96482` cycles	`97715` cycles	`0.99`
`ML-KEM-768 decaps`	`119992` cycles	`120612` cycles	`0.99`
`ML-KEM-1024 keypair`	`132324` cycles	`131604` cycles	`1.01`
`ML-KEM-1024 encaps`	`145133` cycles	`144921` cycles	`1.00`
`ML-KEM-1024 decaps`	`178034` cycles	`177617` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

AMD EPYC 4th gen (c7a)

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`11664` cycles	`11593` cycles	`1.01`
`ML-KEM-512 encaps`	`13307` cycles	`13263` cycles	`1.00`
`ML-KEM-512 decaps`	`18042` cycles	`18133` cycles	`0.99`
`ML-KEM-768 keypair`	`20062` cycles	`20193` cycles	`0.99`
`ML-KEM-768 encaps`	`21078` cycles	`21097` cycles	`1.00`
`ML-KEM-768 decaps`	`28216` cycles	`28317` cycles	`1.00`
`ML-KEM-1024 keypair`	`27317` cycles	`27042` cycles	`1.01`
`ML-KEM-1024 encaps`	`29063` cycles	`29073` cycles	`1.00`
`ML-KEM-1024 decaps`	`38734` cycles	`38561` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

AMD EPYC 3rd gen (c6a)

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`17248` cycles	`17106` cycles	`1.01`
`ML-KEM-512 encaps`	`18991` cycles	`18845` cycles	`1.01`
`ML-KEM-512 decaps`	`24425` cycles	`24238` cycles	`1.01`
`ML-KEM-768 keypair`	`29361` cycles	`29373` cycles	`1.00`
`ML-KEM-768 encaps`	`30528` cycles	`30558` cycles	`1.00`
`ML-KEM-768 decaps`	`38370` cycles	`38399` cycles	`1.00`
`ML-KEM-1024 keypair`	`43031` cycles	`42700` cycles	`1.01`
`ML-KEM-1024 encaps`	`44881` cycles	`44927` cycles	`1.00`
`ML-KEM-1024 decaps`	`55396` cycles	`55394` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

AMD EPYC 4th gen (c7a) (no-opt)

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`36681` cycles	`36203` cycles	`1.01`
`ML-KEM-512 encaps`	`43137` cycles	`42835` cycles	`1.01`
`ML-KEM-512 decaps`	`56101` cycles	`55853` cycles	`1.00`
`ML-KEM-768 keypair`	`59829` cycles	`59952` cycles	`1.00`
`ML-KEM-768 encaps`	`68131` cycles	`68249` cycles	`1.00`
`ML-KEM-768 decaps`	`85739` cycles	`85678` cycles	`1.00`
`ML-KEM-1024 keypair`	`87413` cycles	`87685` cycles	`1.00`
`ML-KEM-1024 encaps`	`99563` cycles	`99600` cycles	`1.00`
`ML-KEM-1024 decaps`	`121279` cycles	`121303` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Graviton2

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`28869` cycles	`28853` cycles	`1.00`
`ML-KEM-512 encaps`	`34131` cycles	`34023` cycles	`1.00`
`ML-KEM-512 decaps`	`44556` cycles	`44635` cycles	`1.00`
`ML-KEM-768 keypair`	`49208` cycles	`49201` cycles	`1.00`
`ML-KEM-768 encaps`	`54279` cycles	`54287` cycles	`1.00`
`ML-KEM-768 decaps`	`69129` cycles	`69150` cycles	`1.00`
`ML-KEM-1024 keypair`	`71654` cycles	`71497` cycles	`1.00`
`ML-KEM-1024 encaps`	`79879` cycles	`79875` cycles	`1.00`
`ML-KEM-1024 decaps`	`99907` cycles	`100023` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Graviton4

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`17912` cycles	`17917` cycles	`1.00`
`ML-KEM-512 encaps`	`21015` cycles	`20978` cycles	`1.00`
`ML-KEM-512 decaps`	`27649` cycles	`27615` cycles	`1.00`
`ML-KEM-768 keypair`	`30898` cycles	`30900` cycles	`1.00`
`ML-KEM-768 encaps`	`33555` cycles	`33566` cycles	`1.00`
`ML-KEM-768 decaps`	`43132` cycles	`43170` cycles	`1.00`
`ML-KEM-1024 keypair`	`44618` cycles	`44636` cycles	`1.00`
`ML-KEM-1024 encaps`	`49604` cycles	`49587` cycles	`1.00`
`ML-KEM-1024 decaps`	`62595` cycles	`62606` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

AMD EPYC 3rd gen (c6a) (no-opt)

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`38419` cycles	`38511` cycles	`1.00`
`ML-KEM-512 encaps`	`46679` cycles	`46823` cycles	`1.00`
`ML-KEM-512 decaps`	`60024` cycles	`60266` cycles	`1.00`
`ML-KEM-768 keypair`	`63829` cycles	`63647` cycles	`1.00`
`ML-KEM-768 encaps`	`74355` cycles	`74267` cycles	`1.00`
`ML-KEM-768 decaps`	`92303` cycles	`92275` cycles	`1.00`
`ML-KEM-1024 keypair`	`94273` cycles	`94093` cycles	`1.00`
`ML-KEM-1024 encaps`	`108245` cycles	`107834` cycles	`1.00`
`ML-KEM-1024 decaps`	`130849` cycles	`130382` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Intel Xeon 3rd gen (c6i)

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`16089` cycles	`16066` cycles	`1.00`
`ML-KEM-512 encaps`	`18258` cycles	`18228` cycles	`1.00`
`ML-KEM-512 decaps`	`24727` cycles	`24691` cycles	`1.00`
`ML-KEM-768 keypair`	`27733` cycles	`29892` cycles	`0.93`
`ML-KEM-768 encaps`	`29418` cycles	`29462` cycles	`1.00`
`ML-KEM-768 decaps`	`38796` cycles	`38836` cycles	`1.00`
`ML-KEM-1024 keypair`	`36937` cycles	`37346` cycles	`0.99`
`ML-KEM-1024 encaps`	`40217` cycles	`39511` cycles	`1.02`
`ML-KEM-1024 decaps`	`52980` cycles	`52972` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Graviton3

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`19078` cycles	`19079` cycles	`1.00`
`ML-KEM-512 encaps`	`22313` cycles	`22323` cycles	`1.00`
`ML-KEM-512 decaps`	`29558` cycles	`29568` cycles	`1.00`
`ML-KEM-768 keypair`	`32615` cycles	`32597` cycles	`1.00`
`ML-KEM-768 encaps`	`35639` cycles	`35682` cycles	`1.00`
`ML-KEM-768 decaps`	`45969` cycles	`46008` cycles	`1.00`
`ML-KEM-1024 keypair`	`46903` cycles	`46884` cycles	`1.00`
`ML-KEM-1024 encaps`	`52137` cycles	`52150` cycles	`1.00`
`ML-KEM-1024 decaps`	`66024` cycles	`66043` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Graviton4 (no-opt)

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`35775` cycles	`35803` cycles	`1.00`
`ML-KEM-512 encaps`	`40670` cycles	`40661` cycles	`1.00`
`ML-KEM-512 decaps`	`52114` cycles	`52075` cycles	`1.00`
`ML-KEM-768 keypair`	`59529` cycles	`59552` cycles	`1.00`
`ML-KEM-768 encaps`	`66475` cycles	`66613` cycles	`1.00`
`ML-KEM-768 decaps`	`81517` cycles	`81054` cycles	`1.01`
`ML-KEM-1024 keypair`	`88515` cycles	`88499` cycles	`1.00`
`ML-KEM-1024 encaps`	`98498` cycles	`98567` cycles	`1.00`
`ML-KEM-1024 decaps`	`117306` cycles	`117295` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Intel Xeon 3rd gen (c6i) (no-opt)

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`46399` cycles	`46317` cycles	`1.00`
`ML-KEM-512 encaps`	`54832` cycles	`54579` cycles	`1.00`
`ML-KEM-512 decaps`	`70291` cycles	`70062` cycles	`1.00`
`ML-KEM-768 keypair`	`75918` cycles	`75201` cycles	`1.01`
`ML-KEM-768 encaps`	`86789` cycles	`86339` cycles	`1.01`
`ML-KEM-768 decaps`	`106772` cycles	`106477` cycles	`1.00`
`ML-KEM-1024 keypair`	`111181` cycles	`110996` cycles	`1.00`
`ML-KEM-1024 encaps`	`125003` cycles	`125147` cycles	`1.00`
`ML-KEM-1024 decaps`	`150348` cycles	`150615` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Graviton2 (no-opt)

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`59351` cycles	`59295` cycles	`1.00`
`ML-KEM-512 encaps`	`67938` cycles	`67869` cycles	`1.00`
`ML-KEM-512 decaps`	`86627` cycles	`86570` cycles	`1.00`
`ML-KEM-768 keypair`	`100193` cycles	`98822` cycles	`1.01`
`ML-KEM-768 encaps`	`110278` cycles	`109982` cycles	`1.00`
`ML-KEM-768 decaps`	`134707` cycles	`135092` cycles	`1.00`
`ML-KEM-1024 keypair`	`149548` cycles	`148315` cycles	`1.01`
`ML-KEM-1024 encaps`	`164750` cycles	`163796` cycles	`1.01`
`ML-KEM-1024 decaps`	`196178` cycles	`195279` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Graviton3 (no-opt)

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`38862` cycles	`38951` cycles	`1.00`
`ML-KEM-512 encaps`	`44668` cycles	`44913` cycles	`0.99`
`ML-KEM-512 decaps`	`56479` cycles	`56689` cycles	`1.00`
`ML-KEM-768 keypair`	`64398` cycles	`64407` cycles	`1.00`
`ML-KEM-768 encaps`	`71585` cycles	`71672` cycles	`1.00`
`ML-KEM-768 decaps`	`87533` cycles	`88074` cycles	`0.99`
`ML-KEM-1024 keypair`	`95977` cycles	`95496` cycles	`1.01`
`ML-KEM-1024 encaps`	`106223` cycles	`106325` cycles	`1.00`
`ML-KEM-1024 decaps`	`126885` cycles	`126840` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Arm Cortex-A55 (Snapdragon 888) benchmarks

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`59514` cycles	`59457` cycles	`1.00`
`ML-KEM-512 encaps`	`66792` cycles	`66622` cycles	`1.00`
`ML-KEM-512 decaps`	`85337` cycles	`85254` cycles	`1.00`
`ML-KEM-768 keypair`	`101306` cycles	`101378` cycles	`1.00`
`ML-KEM-768 encaps`	`112204` cycles	`112384` cycles	`1.00`
`ML-KEM-768 decaps`	`138953` cycles	`138766` cycles	`1.00`
`ML-KEM-1024 keypair`	`153745` cycles	`153640` cycles	`1.00`
`ML-KEM-1024 encaps`	`170807` cycles	`171122` cycles	`1.00`
`ML-KEM-1024 decaps`	`207018` cycles	`206445` cycles	`1.00`

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mkannwischer

Thanks @rod-chapman. The change as it stands right now makes sense to me.
It aligns the poly_rej_uniform_x4 signature with the poly_getnoise_etaX_x4 signature.

oqs-bot

SpacemiT K1 8 (Banana Pi F3) benchmarks

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`226703` cycles	`226252` cycles	`1.00`
`ML-KEM-512 encaps`	`270691` cycles	`270334` cycles	`1.00`
`ML-KEM-512 decaps`	`345000` cycles	`344528` cycles	`1.00`
`ML-KEM-768 keypair`	`375749` cycles	`377767` cycles	`0.99`
`ML-KEM-768 encaps`	`432806` cycles	`434624` cycles	`1.00`
`ML-KEM-768 decaps`	`529256` cycles	`532038` cycles	`0.99`
`ML-KEM-1024 keypair`	`556116` cycles	`556966` cycles	`1.00`
`ML-KEM-1024 encaps`	`632570` cycles	`632956` cycles	`1.00`
`ML-KEM-1024 decaps`	`754827` cycles	`754220` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

oqs-bot

Arm Cortex-A76 (Raspberry Pi 5) benchmarks

Benchmark suite	Current: `624f56d`	Previous: `65e4512`	Ratio
`ML-KEM-512 keypair`	`28832` cycles	`28848` cycles	`1.00`
`ML-KEM-512 encaps`	`34044` cycles	`34093` cycles	`1.00`
`ML-KEM-512 decaps`	`44647` cycles	`44556` cycles	`1.00`
`ML-KEM-768 keypair`	`49185` cycles	`49194` cycles	`1.00`
`ML-KEM-768 encaps`	`54269` cycles	`54242` cycles	`1.00`
`ML-KEM-768 decaps`	`69126` cycles	`69158` cycles	`1.00`
`ML-KEM-1024 keypair`	`71615` cycles	`71608` cycles	`1.00`
`ML-KEM-1024 encaps`	`79961` cycles	`79843` cycles	`1.00`
`ML-KEM-1024 decaps`	`99989` cycles	`99967` cycles	`1.00`

This comment was automatically generated by workflow using github-action-benchmark.

rod-chapman requested a review from a team as a code owner July 8, 2025 12:23

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rod-chapman force-pushed the simplify_gen_matrix branch from 5b99285 to 575696b Compare July 8, 2025 14:39

hanno-becker added the benchmark this PR should be benchmarked in CI label Jul 8, 2025

rod-chapman force-pushed the simplify_gen_matrix branch from 575696b to 5831ec5 Compare July 8, 2025 14:59

rod-chapman force-pushed the simplify_gen_matrix branch from 5831ec5 to 624f56d Compare July 8, 2025 15:15

hanno-becker removed the benchmark this PR should be benchmarked in CI label Jul 8, 2025

rod-chapman requested a review from hanno-becker July 8, 2025 18:40

mkannwischer added the benchmark this PR should be benchmarked in CI label Jul 9, 2025

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hanno-becker merged commit 1ab3bad into main Jul 9, 2025
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hanno-becker deleted the simplify_gen_matrix branch July 9, 2025 05:11

hanno-becker mentioned this pull request Jul 10, 2025

Switch mlk_polyvec and mlk_polymat to struct wrappers #1115

Open

Simplify gen_matrix() and poly_rej_uniform_x4() #1112

Simplify gen_matrix() and poly_rej_uniform_x4() #1112

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Intel Xeon 3rd gen (c6i)

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Graviton4 (no-opt)

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Intel Xeon 3rd gen (c6i) (no-opt)

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rod-chapman commented Jul 8, 2025 •

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