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Hyperscan fails to build with Clang when the "sometimes-unitialized"
check is switched on:
src/fdr/teddy_runtime_common.h:359:13: error: variable 'val' is used
uninitialized whenever 'if' condition is false
[-Werror,-Wsometimes-uninitialized]
if (avail >= 64) {
^~~~~~~~~~~
src/fdr/teddy_runtime_common.h:388:27: note: uninitialized use occurs
here
val = loadu_mask_m512(val, j, ptr);
^~~
src/fdr/teddy_runtime_common.h:359:9: note: remove the 'if' if its
condition is always true
if (avail >= 64) {
^~~~~~~~~~~~~~~~~
src/fdr/teddy_runtime_common.h:351:5: note: variable 'val' is declared
here
m512 val;
^
Always initialize 'val' to zero upon declaration.
Signed-off-by: Dmitry Rozhkov <dmitry.rozhkov@intel.com>
GerHobbelt
pushed a commit
to GerHobbelt/hyperscan
that referenced
this pull request
Aug 31, 2025
* Revert "Fix noodle SVE2 off by one bug" This patch was fixing the bug when it happens at the end of the buffer but it wasn't fixing it when we do scanDoubleOnce before the main loop The next patch fix this bug for both case instead This reverts commit 48dd0e5. * Fix noodle spurious match with \0 chars for SVE2 When sve2's noodle process a non full vector (before the main loop or at the end of it), a fake \0 was being parsed, trigerring a match for pattern that ended with \0. This patch fix this. Signed-off-by: Yoan Picchi <yoan.picchi@arm.com> --------- Signed-off-by: Yoan Picchi <yoan.picchi@arm.com>
GerHobbelt
pushed a commit
to GerHobbelt/hyperscan
that referenced
this pull request
Aug 31, 2025
Multiple changes since last release, this will be the last 100% ABI and API compatible with Hyperscan release. Next versions will include major refactors and API extensions, it will be mostly backwards compatible however. Without particular order, platform support is now: * Linux (x86, Arm, Power) * FreeBSD 14 (x86, Arm, Power) * MacOS 14+ (x86, Arm) In total more than 200 configurations in the CI are tested for every PR. Other features: - Fat Runtime supported for Arm as well (ASIMD/SVE/SVE2). - Initial implementations for Arm SVE/SVE2 algorithms added, thanks to Yoan Picchi from Arm. - SIMDe support added, used as an alternative backend for existing platforms, but mostly interesting for allowing Vectorscan to build in new platforms without a supported SIMD engine. - Various speedups and optimizations. - Cppcheck and clang-tidy fixes throughout the code, both have been added to CI for multiple configurations, but only cppcheck triggers a build failure for now. Various bugfixes, most important listed: - Speed up truffle with 256b TBL instructions (intel#290) - Fix Clang Tidy warnings (intel#295) - Clang 17+ is more restrictive on rebind<T> on MacOS/Boost, remove warning (intel#332) - partial_load_u64 will fail if buf == NULL/c_len == 0 (intel#331) - Bugfix/fix avx512vbmi regressions (intel#335) - fix missing hs_version.h header (closes intel#198) - hs_valid_platform: Fix check for SSE4.2 (intel#310) - Fixed out of bounds read in AVX512VBMI version of fdr_exec_fat_teddy … (intel#333) - Fix noodle SVE2 off by one bug (intel#313) - Make vectorscan accept \0 starting pattern (intel#312) - Fix 5.4.11's config step regression (intel#327) - Fix double shufti's vector end false positive (intel#325)
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Hyperscan fails to build with Clang with the "sometimes-unitialized" check switched on:
Always initialize
valto zero upon declaration.NOTE: this PR fixes the build failure only. I don't know if initializing
valto zero is harmless.