gcc/testsuite/gcc.dg/optimize-bswapsi-3.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 typedef int SItype __attribute__ ((mode (SI)));
   8 typedef int DItype __attribute__ ((mode (DI)));
   9
  10 /* This variant comes from optimize-bswapsi-1.c swap32_d.  It detects a missing
  11    cast of MARKER_BYTE_UNKNOWN to uint64_t for the CASE_CONVERT case for host
  12    architecture where a left shift with too big an operand gives zero.  */
  13
  14 SItype
  15 swap32 (SItype in)
  16 {
  17   return (((in >> 0) & 0xFF) << 24)
  18          | (((in >> 8) & 0xFF) << 16)
  19          | (((((DItype) in) & 0xFF00FF0000llu) >> 16) << 8)
  20          | (((in >> 24) & 0xFF) << 0);
  21 }
  22
  23 /* { dg-final { scan-tree-dump-not "32 bit bswap implementation found at" "bswap" } } */