27 lines
779 B
C
27 lines
779 B
C
/* { dg-do compile } */
|
|
/* { dg-require-effective-target bswap64 } */
|
|
/* { dg-require-effective-target stdint_types } */
|
|
/* { dg-options "-O2 -fdump-tree-bswap" } */
|
|
/* { dg-additional-options "-mzarch" { target s390*-*-* } } */
|
|
|
|
#include <stdint.h>
|
|
|
|
/* A variant via unsigned short. */
|
|
|
|
uint64_t
|
|
swap64_c (uint64_t x)
|
|
{
|
|
uint16_t a0 = x >> 48;
|
|
uint16_t a1 = x >> 32;
|
|
uint16_t a2 = x >> 16;
|
|
uint16_t a3 = x;
|
|
|
|
return ((uint64_t) (((a0 >> 8) & 0xff) | ((a0 << 8) & 0xff00)))
|
|
| ((uint64_t) (((a1 >> 8) & 0xff) | ((a1 << 8) & 0xff00)) << 16)
|
|
| ((uint64_t) (((a2 >> 8) & 0xff) | ((a2 << 8) & 0xff00)) << 32)
|
|
| ((uint64_t) (((a3 >> 8) & 0xff) | ((a3 << 8) & 0xff00)) << 48);
|
|
}
|
|
|
|
|
|
/* { dg-final { scan-tree-dump-times "64 bit bswap implementation found at" 1 "bswap" } } */
|