https://bugs.llvm.org/show_bug.cgi?id=44652
Bug ID: 44652
Summary: eb0e1978df7b9e7 caused msan false positive in
vectorized crc code
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: nicolaswe...@gmx.de
CC: llvm-bugs@lists.llvm.org
Created attachment 23056
--> https://bugs.llvm.org/attachment.cgi?id=23056&action=edit
crc_folding.c standalone repro
This is very similar to issue 42982, but in slightly different vectorized crc
code in zlib.
As far as I can tell, no uninitialized reads happen here, and things are happy
before eb0e1978df7b9e7
bin/clang crc_folding.c -msse4.2 -mpclmul -g -O2 -fsanitize=memory && ./a.out
==135688==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x499549 in crc_fold_512to32
/usr/local/google/home/thakis/src/chrome/src/crc_folding.c:479:16
#1 0x499549 in main
/usr/local/google/home/thakis/src/chrome/src/crc_folding.c:514:10
#2 0x7f706ab6f52a in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2352a)
#3 0x41f269 in _start
(/usr/local/google/home/thakis/src/chrome/src/a.out+0x41f269)
SUMMARY: MemorySanitizer: use-of-uninitialized-value
/usr/local/google/home/thakis/src/chrome/src/crc_folding.c:479:16 in
crc_fold_512to32
(reduced from https://crbug.com/1045291)
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