What's new?

Fixed two issues:

• fix #545 --disable-avx512 tested and working
• fix #544 (same as #537) a bug in the ugrep v7.6 ~ v7.8 (since March 5, 2026) that can't handle very long lines in huge files properly, outputting uninitialized input file buffer contents as if part of the matching line or contents read after the input file buffer as if part of the matching line.

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