http://llvm.org/bugs/show_bug.cgi?id=22253
Bug ID: 22253
Summary: -Wdivision-by-zero does not warn on "1000 / (unsigned
char)(a << 8)"
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
I think the current -Wdivision-by-zero can be improved by considering to
support the following case, where "(unsigned char)(a << 8)" is zero.
$: cat s.c
int a;
int fn1() {
return 1000 / (unsigned char)(a << 8);
}
$:
$: gcc-trunk -c s.c -Wdiv-by-zero
s.c: In function ‘fn1’:
s.c:3:15: warning: division by zero [-Wdiv-by-zero]
return 1000 / (unsigned char)(a << 8);
^
$:
$: clang-trunk -c s.c -Wdivision-by-zero
$:
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