[llvm-bugs] [Bug 44317] New: -Wconversion warning not detecting potential overflow
via llvm-bugs
llvm-bugs at lists.llvm.org
Mon Dec 16 15:32:41 PST 2019
https://bugs.llvm.org/show_bug.cgi?id=44317
Bug ID: 44317
Summary: -Wconversion warning not detecting potential overflow
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: unassignedclangbugs at nondot.org
Reporter: leonardchan at google.com
CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
richard-llvm at metafoo.co.uk
Given the following code:
```
typedef short unsigned int uint16_t;
uint16_t func(uint16_t x, uint16_t mask) {
x += ~mask;
return x;
}
```
GCC is able to emit a warning with `-Wconversion` on the `x += ~mask` which can
cause an unexpected overflow. We do not get any similar warning with
`-Wconversion` on clang though, which would be nice to have.
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