http://llvm.org/bugs/show_bug.cgi?id=15383
Bug ID: 15383
Summary: sanitize float-cast-overflow false positive with 255.5
to uint8_t?
Product: new-bugs
Version: trunk
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Consider this C++:
-------------------
#include <stdint.h>
int main (void)
{
double d = 255.5;
uint8_t c = (uint8_t)d;
return c;
}
-------------------
then:
$ clang++ -fsanitize=float-cast-overflow test.cxx
runtime error: value 255.5 is outside the range of representable values of type
'unsigned char'
The standard seems to say "An rvalue of a floating point type can be converted
to an rvalue of an integer type. The conversion truncates; that is, the
fractional part is discarded. The behavior is undefined if the ***truncated***
value cannot be represented in the destination type." (emphasis mine)
So I believe clang is wrong to warn here.
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