gcc/testsuite/gcc.dg/optimize-bswapsi-4.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target bswap } */
   3 /* { dg-options "-O2 -fdump-tree-bswap" } */
   4 /* { dg-additional-options "-march=z900" { target s390-*-* } } */
   5
   6 typedef unsigned char u8;
   7 typedef unsigned int u32;
   8 union __anonunion
   9 {
  10   u32 value;
  11   u8 bytes[4];
  12 };
  13
  14 u32
  15 acpi_ut_dword_byte_swap (u32 value)
  16 {
  17   union __anonunion in;
  18   in.value = value;
  19 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  20   return ((in.bytes[0] << 24) | (in.bytes[1] << 16)
  21           | (in.bytes[2] << 8) | in.bytes[3]);
  22 #else
  23   return ((in.bytes[3] << 24) | (in.bytes[2] << 16)
  24           | (in.bytes[1] << 8) | in.bytes[0]);
  25 #endif
  26 }
  27
  28 /* { dg-final { scan-tree-dump "32 bit bswap implementation found at" "bswap" } } */