gcc/testsuite/gcc.dg/optimize-bswapsi-2.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target bswap } */
   3 /* { dg-require-effective-target stdint_types } */
   4 /* { dg-options "-O2 -fdump-tree-bswap" } */
   5 /* { dg-additional-options "-march=z900" { target s390*-*-* } } */
   6
   7 #include <stdint.h>
   8
   9 extern unsigned char data[4];
  10
  11 struct uint32_st {
  12   unsigned char u0, u1, u2, u3;
  13 };
  14
  15 uint32_t read_le32_1 (void)
  16 {
  17   return data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
  18 }
  19
  20 uint32_t read_le32_2 (struct uint32_st data)
  21 {
  22   return data.u0 | (data.u1 << 8) | (data.u2 << 16) | (data.u3 << 24);
  23 }
  24
  25 uint32_t read_le32_3 (unsigned char *data)
  26 {
  27   return *data | (*(data + 1) << 8) | (*(data + 2) << 16)
  28          | (*(data + 3) << 24);
  29 }
  30
  31 uint32_t read_be32_1 (void)
  32 {
  33   return data[3] | (data[2] << 8) | (data[1] << 16) | (data[0] << 24);
  34 }
  35
  36 uint32_t read_be32_2 (struct uint32_st data)
  37 {
  38   return data.u3 | (data.u2 << 8) | (data.u1 << 16) | (data.u0 << 24);
  39 }
  40
  41 uint32_t read_be32_3 (unsigned char *data)
  42 {
  43   return *(data + 3) | (*(data + 2) << 8) | (*(data + 1) << 16)
  44          | (*data << 24);
  45 }
  46
  47 /* { dg-final { scan-tree-dump-times "32 bit load in target endianness found at" 3 "bswap" } } */
  48 /* { dg-final { scan-tree-dump-times "32 bit bswap implementation found at" 3 "bswap" } } */