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crypto - threaded K12: separate context computation from thread spawning - #25793

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jedisct1 merged 2 commits into
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jedisct1:precompute-contexts
Nov 3, 2025
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crypto - threaded K12: separate context computation from thread spawning#25793
jedisct1 merged 2 commits into
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jedisct1:precompute-contexts

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@jedisct1jedisct1 commented Nov 3, 2025

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Compute all contexts and store them in a pre-allocated array, then spawn threads using the pre-computed contexts.

This ensures each context is fully materialized in memory with the correct values before any thread tries to access it.

Also unroll the permutation rounds only twice.

This appears to deliver the best performance thanks to improved cache utilization, and it’s consistent with what we already do for regular SHA3.

@jedisct1
threaded K12: separate context computation from thread spawning
06cfea7
Compute all contexts and store them in a pre-allocated array,
then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the
correct values before any thread tries to access it.
@jedisct1
kt128: unroll the permutation rounds only twice
1fb0c58
This appears to deliver the best performance thanks to improved cache
utilization, and it’s consistent with what we already do for SHA3.
@jedisct1
jedisct1 merged commit ee4df4a into ziglang:masterNov 3, 2025
9 checks passed
andrewrk added a commit that referenced this pull request Nov 22, 2025
@andrewrk
Revert std.crypto kangarootwelve addition
bb3b5d0
I would like a chance to review this before it lands, please. Feel free
to submit the work again without changes and I will make review
comments.
In the meantime, these reverts avoid intermittent CI failures, and
remove bad patterns from occurring in the standard library that other
users might copy.
Revert "std.crypto: improve KT documentation, use key_length for B3 key length (#25807)"
This reverts commit 4b593a6.
Revert "crypto - threaded K12: separate context computation from thread spawning (#25793)"
This reverts commit ee4df4a.
Revert "crypto.kt128: when using incremental hashing, use SIMD when possible (#25783)"
This reverts commit bf90825.
Revert "Add std.crypto.hash.sha3.{KT128,KT256} - RFC 9861. (#25593)"
This reverts commit 95c76b1.
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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
crypto - threaded K12: separate context computation from thread spawning by jedisct1 · Pull Request #25793 · ziglang/zig · GitHub
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crypto - threaded K12: separate context computation from thread spawning - #25793
Merged
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
Nov 3, 2025
Merged
crypto - threaded K12: separate context computation from thread spawning#25793
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
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@jedisct1jedisct1
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Nov 3, 2025

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Compute all contexts and store them in a pre-allocated array, then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the correct values before any thread tries to access it.
Also unroll the permutation rounds only twice.
This appears to deliver the best performance thanks to improved cache utilization, and it’s consistent with what we already do for regular SHA3.
@jedisct1
threaded K12: separate context computation from thread spawning
06cfea7
Compute all contexts and store them in a pre-allocated array,
then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the
correct values before any thread tries to access it.
@jedisct1
kt128: unroll the permutation rounds only twice
1fb0c58
This appears to deliver the best performance thanks to improved cache
utilization, and it’s consistent with what we already do for SHA3.
@jedisct1
jedisct1
merged commit ee4df4a
into
ziglang:masterNov 3, 2025

9 checks passed

andrewrk added a commit
that referenced
this pull request
Nov 22, 2025
@andrewrk
Revert std.crypto kangarootwelve addition
bb3b5d0
I would like a chance to review this before it lands, please. Feel free
to submit the work again without changes and I will make review
comments.
In the meantime, these reverts avoid intermittent CI failures, and
remove bad patterns from occurring in the standard library that other
users might copy.
Revert "std.crypto: improve KT documentation, use key_length for B3 key length (#25807)"
This reverts commit 4b593a6.
Revert "crypto - threaded K12: separate context computation from thread spawning (#25793)"
This reverts commit ee4df4a.
Revert "crypto.kt128: when using incremental hashing, use SIMD when possible (#25783)"
This reverts commit bf90825.
Revert "Add std.crypto.hash.sha3.{KT128,KT256} - RFC 9861. (#25593)"
This reverts commit 95c76b1.
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, 'i');
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
crypto - threaded K12: separate context computation from thread spawning by jedisct1 · Pull Request #25793 · ziglang/zig · GitHub
Skip to content
crypto - threaded K12: separate context computation from thread spawning - #25793
Merged
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
Nov 3, 2025
Merged
crypto - threaded K12: separate context computation from thread spawning#25793
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
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@jedisct1jedisct1
commented
Nov 3, 2025

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Compute all contexts and store them in a pre-allocated array, then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the correct values before any thread tries to access it.
Also unroll the permutation rounds only twice.
This appears to deliver the best performance thanks to improved cache utilization, and it’s consistent with what we already do for regular SHA3.
@jedisct1
threaded K12: separate context computation from thread spawning
06cfea7
Compute all contexts and store them in a pre-allocated array,
then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the
correct values before any thread tries to access it.
@jedisct1
kt128: unroll the permutation rounds only twice
1fb0c58
This appears to deliver the best performance thanks to improved cache
utilization, and it’s consistent with what we already do for SHA3.
@jedisct1
jedisct1
merged commit ee4df4a
into
ziglang:masterNov 3, 2025

9 checks passed

andrewrk added a commit
that referenced
this pull request
Nov 22, 2025
@andrewrk
Revert std.crypto kangarootwelve addition
bb3b5d0
I would like a chance to review this before it lands, please. Feel free
to submit the work again without changes and I will make review
comments.
In the meantime, these reverts avoid intermittent CI failures, and
remove bad patterns from occurring in the standard library that other
users might copy.
Revert "std.crypto: improve KT documentation, use key_length for B3 key length (#25807)"
This reverts commit 4b593a6.
Revert "crypto - threaded K12: separate context computation from thread spawning (#25793)"
This reverts commit ee4df4a.
Revert "crypto.kt128: when using incremental hashing, use SIMD when possible (#25783)"
This reverts commit bf90825.
Revert "Add std.crypto.hash.sha3.{KT128,KT256} - RFC 9861. (#25593)"
This reverts commit 95c76b1.
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, 'i');
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} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
crypto - threaded K12: separate context computation from thread spawning by jedisct1 · Pull Request #25793 · ziglang/zig · GitHub
Skip to content
crypto - threaded K12: separate context computation from thread spawning - #25793
Merged
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
Nov 3, 2025
Merged
crypto - threaded K12: separate context computation from thread spawning#25793
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
Conversation
@jedisct1
@jedisct1jedisct1
commented
Nov 3, 2025

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Contributor
Compute all contexts and store them in a pre-allocated array, then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the correct values before any thread tries to access it.
Also unroll the permutation rounds only twice.
This appears to deliver the best performance thanks to improved cache utilization, and it’s consistent with what we already do for regular SHA3.
@jedisct1
threaded K12: separate context computation from thread spawning
06cfea7
Compute all contexts and store them in a pre-allocated array,
then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the
correct values before any thread tries to access it.
@jedisct1
kt128: unroll the permutation rounds only twice
1fb0c58
This appears to deliver the best performance thanks to improved cache
utilization, and it’s consistent with what we already do for SHA3.
@jedisct1
jedisct1
merged commit ee4df4a
into
ziglang:masterNov 3, 2025

9 checks passed

andrewrk added a commit
that referenced
this pull request
Nov 22, 2025
@andrewrk
Revert std.crypto kangarootwelve addition
bb3b5d0
I would like a chance to review this before it lands, please. Feel free
to submit the work again without changes and I will make review
comments.
In the meantime, these reverts avoid intermittent CI failures, and
remove bad patterns from occurring in the standard library that other
users might copy.
Revert "std.crypto: improve KT documentation, use key_length for B3 key length (#25807)"
This reverts commit 4b593a6.
Revert "crypto - threaded K12: separate context computation from thread spawning (#25793)"
This reverts commit ee4df4a.
Revert "crypto.kt128: when using incremental hashing, use SIMD when possible (#25783)"
This reverts commit bf90825.
Revert "Add std.crypto.hash.sha3.{KT128,KT256} - RFC 9861. (#25593)"
This reverts commit 95c76b1.
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, 'i');
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var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
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} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
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(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
crypto - threaded K12: separate context computation from thread spawning by jedisct1 · Pull Request #25793 · ziglang/zig · GitHub
Skip to content
crypto - threaded K12: separate context computation from thread spawning - #25793
Merged
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
Nov 3, 2025
Merged
crypto - threaded K12: separate context computation from thread spawning#25793
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
Conversation
@jedisct1
@jedisct1jedisct1
commented
Nov 3, 2025

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Contributor
Compute all contexts and store them in a pre-allocated array, then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the correct values before any thread tries to access it.
Also unroll the permutation rounds only twice.
This appears to deliver the best performance thanks to improved cache utilization, and it’s consistent with what we already do for regular SHA3.
@jedisct1
threaded K12: separate context computation from thread spawning
06cfea7
Compute all contexts and store them in a pre-allocated array,
then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the
correct values before any thread tries to access it.
@jedisct1
kt128: unroll the permutation rounds only twice
1fb0c58
This appears to deliver the best performance thanks to improved cache
utilization, and it’s consistent with what we already do for SHA3.
@jedisct1
jedisct1
merged commit ee4df4a
into
ziglang:masterNov 3, 2025

9 checks passed

andrewrk added a commit
that referenced
this pull request
Nov 22, 2025
@andrewrk
Revert std.crypto kangarootwelve addition
bb3b5d0
I would like a chance to review this before it lands, please. Feel free
to submit the work again without changes and I will make review
comments.
In the meantime, these reverts avoid intermittent CI failures, and
remove bad patterns from occurring in the standard library that other
users might copy.
Revert "std.crypto: improve KT documentation, use key_length for B3 key length (#25807)"
This reverts commit 4b593a6.
Revert "crypto - threaded K12: separate context computation from thread spawning (#25793)"
This reverts commit ee4df4a.
Revert "crypto.kt128: when using incremental hashing, use SIMD when possible (#25783)"
This reverts commit bf90825.
Revert "Add std.crypto.hash.sha3.{KT128,KT256} - RFC 9861. (#25593)"
This reverts commit 95c76b1.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
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lastUrl = location.href;
setTimeout(tryTheater, 500);
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observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
crypto - threaded K12: separate context computation from thread spawning by jedisct1 · Pull Request #25793 · ziglang/zig · GitHub
Skip to content
crypto - threaded K12: separate context computation from thread spawning - #25793
Merged
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
Nov 3, 2025
Merged
crypto - threaded K12: separate context computation from thread spawning#25793
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
Conversation
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@jedisct1jedisct1
commented
Nov 3, 2025

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Compute all contexts and store them in a pre-allocated array, then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the correct values before any thread tries to access it.
Also unroll the permutation rounds only twice.
This appears to deliver the best performance thanks to improved cache utilization, and it’s consistent with what we already do for regular SHA3.
@jedisct1
threaded K12: separate context computation from thread spawning
06cfea7
Compute all contexts and store them in a pre-allocated array,
then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the
correct values before any thread tries to access it.
@jedisct1
kt128: unroll the permutation rounds only twice
1fb0c58
This appears to deliver the best performance thanks to improved cache
utilization, and it’s consistent with what we already do for SHA3.
@jedisct1
jedisct1
merged commit ee4df4a
into
ziglang:masterNov 3, 2025

9 checks passed

andrewrk added a commit
that referenced
this pull request
Nov 22, 2025
@andrewrk
Revert std.crypto kangarootwelve addition
bb3b5d0
I would like a chance to review this before it lands, please. Feel free
to submit the work again without changes and I will make review
comments.
In the meantime, these reverts avoid intermittent CI failures, and
remove bad patterns from occurring in the standard library that other
users might copy.
Revert "std.crypto: improve KT documentation, use key_length for B3 key length (#25807)"
This reverts commit 4b593a6.
Revert "crypto - threaded K12: separate context computation from thread spawning (#25793)"
This reverts commit ee4df4a.
Revert "crypto.kt128: when using incremental hashing, use SIMD when possible (#25783)"
This reverts commit bf90825.
Revert "Add std.crypto.hash.sha3.{KT128,KT256} - RFC 9861. (#25593)"
This reverts commit 95c76b1.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
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function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
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el.style.position = 'static';
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})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
})();
crypto - threaded K12: separate context computation from thread spawning by jedisct1 · Pull Request #25793 · ziglang/zig · GitHub
Skip to content
crypto - threaded K12: separate context computation from thread spawning - #25793
Merged
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
Nov 3, 2025
Merged
crypto - threaded K12: separate context computation from thread spawning#25793
jedisct1 merged 2 commits into
ziglang:masterfrom 
jedisct1:precompute-contexts
Conversation
@jedisct1
@jedisct1jedisct1
commented
Nov 3, 2025

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Compute all contexts and store them in a pre-allocated array, then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the correct values before any thread tries to access it.
Also unroll the permutation rounds only twice.
This appears to deliver the best performance thanks to improved cache utilization, and it’s consistent with what we already do for regular SHA3.
@jedisct1
threaded K12: separate context computation from thread spawning
06cfea7
Compute all contexts and store them in a pre-allocated array,
then spawn threads using the pre-computed contexts.
This ensures each context is fully materialized in memory with the
correct values before any thread tries to access it.
@jedisct1
kt128: unroll the permutation rounds only twice
1fb0c58
This appears to deliver the best performance thanks to improved cache
utilization, and it’s consistent with what we already do for SHA3.
@jedisct1
jedisct1
merged commit ee4df4a
into
ziglang:masterNov 3, 2025

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andrewrk added a commit
that referenced
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Nov 22, 2025
@andrewrk
Revert std.crypto kangarootwelve addition
bb3b5d0
I would like a chance to review this before it lands, please. Feel free
to submit the work again without changes and I will make review
comments.
In the meantime, these reverts avoid intermittent CI failures, and
remove bad patterns from occurring in the standard library that other
users might copy.
Revert "std.crypto: improve KT documentation, use key_length for B3 key length (#25807)"
This reverts commit 4b593a6.
Revert "crypto - threaded K12: separate context computation from thread spawning (#25793)"
This reverts commit ee4df4a.
Revert "crypto.kt128: when using incremental hashing, use SIMD when possible (#25783)"
This reverts commit bf90825.
Revert "Add std.crypto.hash.sha3.{KT128,KT256} - RFC 9861. (#25593)"
This reverts commit 95c76b1.
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@jedisct1