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@wxhwyr wxhwyr commented Jan 15, 2026

What problem does this PR solve?

Issue Number: close #126

Type of Change

  • πŸ› Bug fix (non-breaking change which fixes an issue)
  • ✨ New feature (non-breaking change which adds functionality)
  • πŸš€ Performance improvement (optimization)
  • ⚠️ Breaking change (fix or feature that would cause existing functionality to change)
  • πŸ”¨ Refactoring (no logic changes)
  • πŸ”§ Build/CI or Infrastructure changes
  • πŸ“ Documentation only

Description

Added an SVE vectorized implementation for facebook::velox::functions::stringCore::isAscii.

Performance Impact

  • No Impact: This change does not affect the critical path (e.g., build system, doc, error handling).
  • Positive Impact: I have run benchmarks with Velox, and will run with Bolt soon.
  • Negative Impact: Explained below (e.g., trade-off for correctness).

Release Note

Please describe the changes in this PR

Release Note:

Release Note:
- Added an SVE vectorized implementation for facebook::velox::functions::stringCore::isAscii.

Checklist (For Author)

  • I have added/updated unit tests (ctest).
  • I have verified the code with local build (Release/Debug).
  • I have run clang-format / linters.
  • (Optional) I have run Sanitizers (ASAN/TSAN) locally for complex C++ changes.
  • No need to test or manual test.

Breaking Changes

  • No
  • Yes

size_t i = 0;
const size_t sve_vector_size = svcntb();
while (i < length) {
svbool_t pgTail = svwhilelt_b8(i, length);
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Does svwhilelt_b8 need a header file ?

return true;
return true;
#else
for (auto i = 0; i < length; i++) {
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add a x86 implements using _mm256_loadu_si256 and _mm256_movemask_epi8 ?

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[Feature] Add SVE (Scalable Vector Extension) support for StringCore.h

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