diff options
Diffstat (limited to 'sysdeps/tile/tilegx/string-endian.h')
| -rw-r--r-- | sysdeps/tile/tilegx/string-endian.h | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/sysdeps/tile/tilegx/string-endian.h b/sysdeps/tile/tilegx/string-endian.h index 4733389..2dbc1e4 100644 --- a/sysdeps/tile/tilegx/string-endian.h +++ b/sysdeps/tile/tilegx/string-endian.h @@ -16,24 +16,36 @@ License along with the GNU C Library. If not, see <http://www.gnu.org/licenses/>. */ -/* Provide a mask based on the pointer alignment that +#include <endian.h> +#include <stdint.h> + +/* Provide a set of macros to help keep endianness #ifdefs out of + the string functions. + + MASK: Provide a mask based on the pointer alignment that sets up non-zero bytes before the beginning of the string. The MASK expression works because shift counts are taken mod 64. - Also, specify how to count "first" and "last" bits - when the bits have been read as a word. */ -#include <stdint.h> + NULMASK: Clear bytes beyond a given point in the string. + + CFZ: Find the first zero bit in the 8 string bytes in a long. + + REVCZ: Find the last zero bit in the 8 string bytes in a long. + + STRSHIFT: Shift N bits towards the start of the string. */ -#ifndef __BIG_ENDIAN__ +#if __BYTE_ORDER == __LITTLE_ENDIAN #define MASK(x) (__insn_shl(1ULL, (x << 3)) - 1) #define NULMASK(x) ((2ULL << x) - 1) #define CFZ(x) __insn_ctz(x) #define REVCZ(x) __insn_clz(x) +#define STRSHIFT(x,n) ((x) >> n) #else #define MASK(x) (__insn_shl(-2LL, ((-x << 3) - 1))) #define NULMASK(x) (-2LL << (63 - x)) #define CFZ(x) __insn_clz(x) #define REVCZ(x) __insn_ctz(x) +#define STRSHIFT(x,n) ((x) << n) #endif /* Create eight copies of the byte in a uint64_t. Byte Shuffle uses |