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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/asm/swab.h


$ cat -n /usr/include/x86_64-linux-gnu/asm/swab.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _ASM_X86_SWAB_H
     3	#define _ASM_X86_SWAB_H
     4	
     5	#include <linux/types.h>
     6	
     7	
     8	static __inline__  __u32 __arch_swab32(__u32 val)
     9	{
    10		__asm__("bswapl %0" : "=r" (val) : "0" (val));
    11		return val;
    12	}
    13	#define __arch_swab32 __arch_swab32
    14	
    15	static __inline__  __u64 __arch_swab64(__u64 val)
    16	{
    17	#ifdef __i386__
    18		union {
    19			struct {
    20				__u32 a;
    21				__u32 b;
    22			} s;
    23			__u64 u;
    24		} v;
    25		v.u = val;
    26		__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
    27		    : "=r" (v.s.a), "=r" (v.s.b)
    28		    : "0" (v.s.a), "1" (v.s.b));
    29		return v.u;
    30	#else /* __i386__ */
    31		__asm__("bswapq %0" : "=r" (val) : "0" (val));
    32		return val;
    33	#endif
    34	}
    35	#define __arch_swab64 __arch_swab64
    36	
    37	#endif /* _ASM_X86_SWAB_H */