i386/linux/linux-2.3.21/include/asm-alpha/byteorder.h

   1 #ifndef _ALPHA_BYTEORDER_H
   2 #define _ALPHA_BYTEORDER_H
   3
   4 #include <asm/types.h>
   5
   6 /* EGCS 1.1 can, without scheduling, do just as good as we do here
   7    with the standard macros.  And since it can schedule, it does even
   8    better in the end.  */
   9
  10 #if defined(__GNUC__) && __GNUC_MINOR__ < 91
  11
  12 static __inline__ __const__ __u32 ___arch__swab32(__u32 x)
  13 {
  14         __u64 t1, t2, t3;
  15
  16         /* Break the final or's out of the block so that gcc can
  17            schedule them at will.  Further, use add not or so that
  18            we elide the sign extend gcc will put in because the
  19            return type is not a long.  */
  20
  21         __asm__(
  22         "insbl  %3,3,%1         # %1 = dd000000\n\t"
  23         "zapnot %3,2,%2         # %2 = 0000cc00\n\t"
  24         "sll    %2,8,%2         # %2 = 00cc0000\n\t"
  25         "or     %2,%1,%1        # %1 = ddcc0000\n\t"
  26         "zapnot %3,4,%2         # %2 = 00bb0000\n\t"
  27         "extbl  %3,3,%0         # %0 = 000000aa\n\t"
  28         "srl    %2,8,%2         # %2 = 0000bb00"
  29         : "=r"(t3), "=&r"(t1), "=&r"(t2)
  30         : "r"(x));
  31
  32         return t3 + t2 + t1;
  33 }
  34
  35 static __inline__ __const__ __u16 ___arch__swab16(__u16 x)
  36 {
  37         __u64 t1, t2;
  38
  39         __asm__(
  40         "insbl  %2,1,%1         # %1 = bb00\n\t"
  41         "extbl  %2,1,%0         # %0 = 00aa"
  42         : "=r"(t1), "=&r"(t2) : "r"(x));
  43
  44         return t1 | t2;
  45 }
  46
  47 #define __arch__swab32(x) ___arch__swab32(x)
  48 #define __arch__swab16(x) ___arch__swab16(x)
  49
  50 #endif /* __GNUC__ */
  51
  52 #define __BYTEORDER_HAS_U64__
  53
  54 #include <linux/byteorder/little_endian.h>
  55
  56 #endif /* _ALPHA_BYTEORDER_H */