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v0.5.1
v0.5.1
https://github.com/python/cpython
Revision db95802bdfac4d13db3e2a391ec7b9e2f8d92dbe authored by Miss Islington (bot) on 22 November 2020, 17:33:09 UTC, committed by GitHub on 22 November 2020, 17:33:09 UTC
The existing volatile `left`/`right` pointers guarantee that the reads will all occur, but does not guarantee that they will be _used_. So a compiler can still short-circuit the loop, saving e.g. the overhead of doing the xors and especially the overhead of the data dependency between `result` and the reads. That would change performance depending on where the first unequal byte occurs. This change removes that optimization. (This is change GH-1 from https://bugs.python.org/issue40791 .) (cherry picked from commit 31729366e2bc09632e78f3896dbce0ae64914f28) Co-authored-by: Devin Jeanpierre <jeanpierreda@google.com>
1 parent 9ae1742
Tip revision: db95802bdfac4d13db3e2a391ec7b9e2f8d92dbe authored by Miss Islington (bot) on 22 November 2020, 17:33:09 UTC
bpo-40791: Make compare_digest more constant-time. (GH-23438)
bpo-40791: Make compare_digest more constant-time. (GH-23438)
Tip revision: db95802
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| .gitattributes | -rw-r--r-- | 1.6 KB |
| .gitignore | -rw-r--r-- | 1.5 KB |
| .travis.yml | -rw-r--r-- | 6.1 KB |
| CODE_OF_CONDUCT.rst | -rw-r--r-- | 631 bytes |
| LICENSE | -rw-r--r-- | 12.5 KB |
| Makefile.pre.in | -rw-r--r-- | 62.9 KB |
| README.rst | -rw-r--r-- | 9.6 KB |
| aclocal.m4 | -rw-r--r-- | 10.7 KB |
| config.guess | -rwxr-xr-x | 43.1 KB |
| config.sub | -rwxr-xr-x | 35.4 KB |
| configure | -rwxr-xr-x | 492.2 KB |
| configure.ac | -rw-r--r-- | 164.8 KB |
| install-sh | -rwxr-xr-x | 7.0 KB |
| pyconfig.h.in | -rw-r--r-- | 42.3 KB |
| setup.py | -rw-r--r-- | 101.3 KB |
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