https://bugs.llvm.org/show_bug.cgi?id=32708
Bug ID: 32708
Summary: The shift didn't carry out the value in bit-field
structure
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: shiva0...@gmail.com
CC: llvm-bugs@lists.llvm.org
According to C99 6.7.2.1
9 A bit-field is interpreted as a signed or unsigned integer type consisting of
the specified number of bits.
So the bit exceed the number of bits after shift should carry out.
In the following case,
x.b:40 initial as 0x0100 should carry out to 0 after (x.b<<32)
struct foo
{
unsigned long long b:40;
} x;
extern void abort (void);
void test1(unsigned long long res)
{
/* The shift is carried out in 40 bit precision. */
if (x.b<<32 != res)
abort ();
}
int main()
{
x.b = 0x0100;
test1(0);
return 0;
}
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
