Commit e5a2cac9 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Drop __arch_swab16(), arch_swab24(), _arch_swab32() and __arch_swab64() functions 



No need to keep those as inline assembly functions, the compiler now
generates the same or even better optimized code.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 7ba88a2a

arch/parisc/include/uapi/asm/swab.h

deleted100644 → 0
+0 −68
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

#ifndef _PARISC_SWAB_H

#define _PARISC_SWAB_H



#include <asm/bitsperlong.h>

#include <linux/types.h>

#include <linux/compiler.h>



#define __SWAB_64_THRU_32__



static inline __attribute_const__ __u16 __arch_swab16(__u16 x)

{

	__asm__("dep %0, 15, 8, %0\n\t"		/* deposit 00ab -> 0bab */

		"shd %%r0, %0, 8, %0"		/* shift 000000ab -> 00ba */

		: "=r" (x)

		: "0" (x));

	return x;

}

#define __arch_swab16 __arch_swab16



static inline __attribute_const__ __u32 __arch_swab24(__u32 x)

{

	__asm__("shd %0, %0, 8, %0\n\t"		/* shift xabcxabc -> cxab */

		"dep %0, 15, 8, %0\n\t"		/* deposit cxab -> cbab */

		"shd %%r0, %0, 8, %0"		/* shift 0000cbab -> 0cba */

		: "=r" (x)

		: "0" (x));

	return x;

}



static inline __attribute_const__ __u32 __arch_swab32(__u32 x)

{

	unsigned int temp;

	__asm__("shd %0, %0, 16, %1\n\t"	/* shift abcdabcd -> cdab */

		"dep %1, 15, 8, %1\n\t"		/* deposit cdab -> cbab */

		"shd %0, %1, 8, %0"		/* shift abcdcbab -> dcba */

		: "=r" (x), "=&r" (temp)

		: "0" (x));

	return x;

}

#define __arch_swab32 __arch_swab32



#if __BITS_PER_LONG > 32

/*

** From "PA-RISC 2.0 Architecture", HP Professional Books.

** See Appendix I page 8 , "Endian Byte Swapping".

**

** Pretty cool algorithm: (* == zero'd bits)

**      PERMH   01234567 -> 67452301 into %0

**      HSHL    67452301 -> 7*5*3*1* into %1

**      HSHR    67452301 -> *6*4*2*0 into %0

**      OR      %0 | %1  -> 76543210 into %0 (all done!)

*/

static inline __attribute_const__ __u64 __arch_swab64(__u64 x)

{

	__u64 temp;

	__asm__("permh,3210 %0, %0\n\t"

		"hshl %0, 8, %1\n\t"

		"hshr,u %0, 8, %0\n\t"

		"or %1, %0, %0"

		: "=r" (x), "=&r" (temp)

		: "0" (x));

	return x;

}

#define __arch_swab64 __arch_swab64

#endif /* __BITS_PER_LONG > 32 */



#endif /* _PARISC_SWAB_H */