On 18/10/2019 19:43, AlwaysTeachingable . wrote:
> The following C code:
> unsigned int wrong(unsigned int n){
> return (n%2) ? 0 : 42;
> }
>
> should return 42 when n is odd and 0 when n is even.
No. Your code returns 42 when n is even.
It's equivalent to "return ((n%2) != 0) ? 0 : 42;"
Now i
The following C code:
unsigned int wrong(unsigned int n){
return (n%2) ? 0 : 42;
}
should return 42 when n is odd and 0 when n is even.
But ARM gcc 8.2 with -O3 produces following assembly:
tst r0, #1
moveq r0, #42
movne r0, #0
bx lr
tst r0,#1 sets Z=1 iff r0 is even, and moveq r0,#42 executes
