gcc/testsuite/gcc.dg/extract_recip_3.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-Ofast -fdump-tree-optimized-raw" } */
   3
   4 float
   5 extract_square (float *a, float *b, float x, float y)
   6 {
   7   *a = 3 / (y * y);
   8   *b = 5 / (y * y);
   9
  10   return x / (y * y);
  11 }
  12
  13 /* Don't expect the 'powmult' (calculation of y * y)
  14    to be deleted until a later pass, so look for one
  15    more multiplication than strictly necessary.  */
  16 float
  17 extract_recip (float *a, float *b, float x, float y, float z)
  18 {
  19   *a = 7 / y;
  20   *b = x / (y * y);
  21
  22   return z / y;
  23 }
  24
  25 /* 4 multiplications in 'extract_square', and 4 in 'extract_recip'.  */
  26 /* { dg-final { scan-tree-dump-times "mult_expr" 8 "optimized" } } */
  27
  28 /* 1 division in 'extract_square', 1 division in 'extract_recip'. */
  29 /* { dg-final { scan-tree-dump-times "rdiv_expr" 2 "optimized" } } */