https://bugs.llvm.org/show_bug.cgi?id=52234
Bug ID: 52234
Summary: Result of left-shifting an unsigned char is (promoted
to?) signed.
Product: new-bugs
Version: 12.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: and...@aitchison.me.uk
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
Created attachment 25378
--> https://bugs.llvm.org/attachment.cgi?id=25378&action=edit
c++ source that exhibits the problem
Compile the attached source
signed_shifts.cpp
with
clang++ -Wsign-conversion -Werror -c -o signed_shifts.o signed_shifts.cpp
With clang++9, clang++-11, clang++-12 or clang++-13, as supplied by Ubuntu
21.10
I get
error: implicit conversion changes signedness: 'int' to 'unsigned int'
[-Werror,-Wsign-conversion]
when an unsigned char is left-shifted and stored in an unsigned int,
unless the result is explicitly cast back to unsigned.
I also see this with gnu g++4,5,6,7,8,9 (9.4.0-3ubuntu1)
but not g++-10 (10.3.0-11ubuntu1 or g++-11 11.2.0-7ubuntu2.
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