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| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-06-15 10:41:29 -0700 |
|---|---|---|
| committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-06-15 14:25:55 -0700 |
| commit | b446822b6ae4e8149902a78cdd4a886634ad6321 (patch) | |
| tree | 417d3ee01f93bd92db817203660b6f8591f625f8 /sysdeps/x86_64 | |
| parent | 686216945a7873237bf892bbe38a2eef23aadeba (diff) | |
| download | glibc-b446822b6ae4e8149902a78cdd4a886634ad6321.tar.gz glibc-b446822b6ae4e8149902a78cdd4a886634ad6321.tar.xz glibc-b446822b6ae4e8149902a78cdd4a886634ad6321.zip | |
x86: Add bounds `x86_non_temporal_threshold`
The lower-bound (16448) and upper-bound (SIZE_MAX / 16) are assumed by memmove-vec-unaligned-erms. The lower-bound is needed because memmove-vec-unaligned-erms unrolls the loop aggressively in the L(large_memset_4x) case. The upper-bound is needed because memmove-vec-unaligned-erms right-shifts the value of `x86_non_temporal_threshold` by LOG_4X_MEMCPY_THRESH (4) which without a bound may overflow. The lack of lower-bound can be a correctness issue. The lack of upper-bound cannot.
Diffstat (limited to 'sysdeps/x86_64')
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