http://llvm.org/bugs/show_bug.cgi?id=16433
Bug ID: 16433
Summary: the unary operator shall return a 0 if the value of
its operand compares unequal to 0, and -1 (i.e. all
bits set) if the value of its operand compares equal
to 0.
Product: clang
Version: 3.3
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Static Analyzer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
#include<stdio.h>
#include <math.h>
typedef char char2 _attribute_((ext_vector_type(2)));
int main(){
char a = 0x0;
char2 b = (char2)
{0,0}
;
printf("%x\n", !a);
printf("%x\n", !b);
}
The result of this code is different between PC and MIPS.
The result is correct in PC , but error in MIPS.
So, it is Clang's bug .
For scalar types, the result of the logical unary operator is 0 if the value of
its operand
compares unequal to 0, and 1 if the value of its operand compares equal to 0.
For vector
types, the unary operator shall return a 0 if the value of its operand compares
unequal to 0,
and -1 (i.e. all bits set) if the value of its operand compares equal to 0.
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