/* { dg-do run } *//* { dg-options "-O1 -fno-tree-vrp -fwrapv" } *//* PR tree-optimization/22236    Avoid conversion of (signed char) {(uchar)1, +, (uchar)1}_x when    it is not possible to prove that the scev does not wrap.      In this PR, a sequence 1, 2, ..., 255 has to be converted to    signed char, but this would wrap: 1, 2, ..., 127, -128, ...  The    result should not be a linear scev {(schar)1, +, (schar)1}_x.    The conversion should be kept: (schar) {(uchar)1, +, (uchar)1}_x. */void abort(void);static inline voidfoo (signed char a){  int b = a - 0x7F;  if (b > 1)    abort();}int main(){  unsigned char b;  for(b = 0; b < 0xFF; b++)    foo (b);  return 0;}