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[pull] master from google:master #261

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Merged
merged 3 commits into from
Oct 20, 2025
Merged

[pull] master from google:master #261

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731e609
Use Lanes(d) masks for target SVE2_128
MDevereau Oct 7, 2025
3ff4a94
Add comment to explain changes
MDevereau Oct 8, 2025
44685b2
Merge pull request #2752 from MDevereau:vls_128
copybara-github Oct 20, 2025
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10 changes: 10 additions & 0 deletions hwy/ops/arm_sve-inl.h
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
// Copyright 2021 Google LLC
// Copyright 2025 Arm Limited and/or its affiliates <open-source-office@arm.com>
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0 (the "License");
Expand Down Expand Up @@ -389,8 +390,17 @@ HWY_API svbool_t PFalse() { return svpfalse_b(); }
//
// This is used in functions that load/store memory; other functions (e.g.
// arithmetic) can ignore d and use PTrue instead.
//
// Always use FirstN(N) for HWY_TARGET == HWY_SVE2_128 to avoid vector length
// information loss when using PTrue(d) predicates in memory intrinsics.
//
// SVE2_256 is untested due to unavailable hardware and cannot assume
// equal minimum and maximum vector lengths as SVE2_128 can.
template <class D>
svbool_t MakeMask(D d) {
#if (HWY_TARGET == HWY_SVE2_128)
return FirstN(d, Lanes(d));
#endif
return IsFull(d) ? PTrue(d) : FirstN(d, Lanes(d));
}

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