https://bugs.llvm.org/show_bug.cgi?id=40063
Bug ID: 40063
Summary: memcmp with constant string arguments produces wrong
result
Product: clang
Version: 6.0
Hardware: PC
OS: FreeBSD
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: br...@clisp.org
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
Created attachment 21244
--> https://bugs.llvm.org/attachment.cgi?id=21244&action=edit
Test case
A memcmp() call with constant arguments is apparently inlined by clang and
produces a wrong result.
How to reproduce:
$ cc foo.c
$ nm a.out | grep memcmp
$ ./a.out
Expected output: A negative number.
Actual output: 1
OS: FreeBSD 12.0 on x86_64
clang version:
$ cc --version
FreeBSD clang version 6.0.1 (tags/RELEASE_601/final 335540) (based on LLVM
6.0.1)
Target: x86_64-unknown-freebsd12.0
Thread model: posix
InstalledDir: /usr/bin
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