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 iff Z=1, therefore it sets r0 to 42 when r0 is even, which is wrong given the C code above ( it should return 0 ).
