gcc/testsuite/gcc.dg/optimize-bswapsi-7.c

   1 /* PR tree-optimization/103376 */
   2 /* { dg-do compile } */
   3 /* { dg-require-effective-target bswap } */
   4 /* { dg-options "-O2 -fno-tree-vectorize -fdump-tree-optimized" } */
   5 /* { dg-additional-options "-march=z900" { target s390-*-* } } */
   6
   7 static unsigned int
   8 f1 (unsigned int x)
   9 {
  10   return (x << 24) | (x >> 8);
  11 }
  12
  13 unsigned int
  14 f2 (unsigned *p)
  15 {
  16   return ((f1 (p[0]) | (p[0] >> 8)) & 0xff000000U) | (p[0] >> 24) | ((p[0] & 0xff00U) << 8) | ((p[0] & 0xff0000U) >> 8);
  17 }
  18
  19 unsigned int
  20 f3 (unsigned *p)
  21 {
  22   return ((f1 (p[0]) | (p[0] & 0x00ff00ffU)) & 0xff00ff00U) | (f1 (f1 (f1 (p[0]))) & 0x00ff00ffU);
  23 }
  24
  25 unsigned int
  26 f4 (unsigned *p)
  27 {
  28   return (f1 (p[0]) ^ (p[0] >> 8)) ^ (p[0] >> 24) ^ ((p[0] & 0xff00U) << 8) ^ ((p[0] & 0xff0000U) >> 8);
  29 }
  30
  31 unsigned int
  32 f5 (unsigned *p)
  33 {
  34   return (((f1 (p[0]) | (p[0] >> 16)) ^ (p[0] >> 8)) & 0xffff0000U) ^ (p[0] >> 24) ^ ((p[0] & 0xff00U) << 8) ^ ((p[0] & 0xff0000U) >> 8);
  35 }
  36
  37 /* { dg-final { scan-tree-dump-times "= __builtin_bswap32 \\\(" 4 "optimized" } } */