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Linux/include/asm-alpha/byteorder.h

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  1 #ifndef _ALPHA_BYTEORDER_H
  2 #define _ALPHA_BYTEORDER_H
  3 
  4 #include <asm/types.h>
  5 #include <asm/compiler.h>
  6 
  7 #ifdef __GNUC__
  8 
  9 static __inline __u32 __attribute__((__const)) __arch__swab32(__u32 x)
 10 {
 11         /*
 12          * Unfortunately, we can't use the 6 instruction sequence
 13          * on ev6 since the latency of the UNPKBW is 3, which is
 14          * pretty hard to hide.  Just in case a future implementation
 15          * has a lower latency, here's the sequence (also by Mike Burrows)
 16          *
 17          * UNPKBW a0, v0       v0: 00AA00BB00CC00DD
 18          * SLL v0, 24, a0      a0: BB00CC00DD000000
 19          * BIS v0, a0, a0      a0: BBAACCBBDDCC00DD
 20          * EXTWL a0, 6, v0     v0: 000000000000BBAA
 21          * ZAP a0, 0xf3, a0    a0: 00000000DDCC0000
 22          * ADDL a0, v0, v0     v0: ssssssssDDCCBBAA
 23          */
 24 
 25         __u64 t0, t1, t2, t3;
 26 
 27         t0 = __kernel_inslh(x, 7);      /* t0 : 0000000000AABBCC */
 28         t1 = __kernel_inswl(x, 3);      /* t1 : 000000CCDD000000 */
 29         t1 |= t0;                       /* t1 : 000000CCDDAABBCC */
 30         t2 = t1 >> 16;                  /* t2 : 0000000000CCDDAA */
 31         t0 = t1 & 0xFF00FF00;           /* t0 : 00000000DD00BB00 */
 32         t3 = t2 & 0x00FF00FF;           /* t3 : 0000000000CC00AA */
 33         t1 = t0 + t3;                   /* t1 : ssssssssDDCCBBAA */
 34 
 35         return t1;
 36 }
 37 
 38 #define __arch__swab32 __arch__swab32
 39 
 40 #endif /* __GNUC__ */
 41 
 42 #define __BYTEORDER_HAS_U64__
 43 
 44 #include <linux/byteorder/little_endian.h>
 45 
 46 #endif /* _ALPHA_BYTEORDER_H */
 47 

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