gcc/testsuite/gcc.target/sh/pr54089-2.c

   1 /* Check that for dynamic logical right shifts with a constant the negated
   2    constant is loaded directly, instead of loading the postitive constant
   3    and negating it separately.  This was a case that happened at optimization
   4    level -O2 and looked like:
   5         cmp/eq  r6,r5
   6         mov     #30,r1
   7         neg     r1,r1
   8         shld    r1,r4
   9         mov     r4,r0
  10         rts
  11         rotcr   r0  */
  12 /* { dg-do compile { target { has_dyn_shift } } }  */
  13 /* { dg-options "-O2" } */
  14 /* { dg-final { scan-assembler-not "neg" } } */
  15
  16 unsigned int
  17 test (unsigned int a, int b, int c)
  18 {
  19   unsigned char r = b == c;
  20   return ((a >> 31) | (r << 31));
  21 }