gcc/testsuite/gcc.target/sh/pr51244-10.c

   1 /* Check that compare-branch is inverted properly.
   2    In this case the improved bit test is a side effect of compare-branch
   3    inversion patterns, even though the branch condition does not get
   4    inverted here.
   5    Example:
   6         mov.b   @(14,r9),r0     ->      mov.b   @(14,r9),r0
   7         shll    r0                      cmp/pz  r0
   8         subc    r0,r0                   bt      .L192
   9         and     #1,r0
  10         tst     r0,r0
  11         bt      .L195
  12 */
  13 /* { dg-do compile }  */
  14 /* { dg-options "-O2" } */
  15 /* { dg-final { scan-assembler-not "shll|subc|and" } } */
  16 int
  17 test_00 (int* p)
  18 {
  19   int nr = 15;
  20   volatile char* addr = (volatile char*)&p[1];
  21
  22   if ((addr[(nr >> 3) ^ 7] & (1 << (nr & 7))) == 0)
  23     return 40;
  24   else
  25     return 50;
  26 }