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| author | Gui Andrade <guiand@google.com> | 2020-08-10 19:03:40 +0000 |
|---|---|---|
| committer | Gui Andrade <guiand@google.com> | 2020-08-10 19:22:27 +0000 |
| commit | c0b5000bd848303320c03f80fbf84d71e74518c9 (patch) | |
| tree | e68d24497dc47c75ef0cffdac307ae98cd69ef18 /llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp | |
| parent | ab6a517ea41e1cb63856cce6f7fa4a196ffca368 (diff) | |
| download | llvm-c0b5000bd848303320c03f80fbf84d71e74518c9.zip llvm-c0b5000bd848303320c03f80fbf84d71e74518c9.tar.gz llvm-c0b5000bd848303320c03f80fbf84d71e74518c9.tar.bz2 | |
[MSAN RT] Use __sanitizer::mem_is_zero in __msan_test_shadow
The former function is particularly optimized for exactly the
use case we're interested in: an all-zero buffer.
This reduces the overhead of calling this function some 80% or
more. This is particularly for instrumenting code heavy with
string processing functions, like grep. An invocation of grep
with the pattern '[aeiou]k[aeiou]' has its runtime reduced by
~75% with this patch
Differential Revision: https://reviews.llvm.org/D84961
Diffstat (limited to 'llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp')
0 files changed, 0 insertions, 0 deletions