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File: [cvs.NetBSD.org] / src / lib / libc / arch / x86_64 / string / swab.S (download)

Revision 1.4, Thu May 22 15:01:57 2014 UTC (9 years, 9 months ago) by uebayasi
Branch: MAIN
CVS Tags: triaxx-drm, tls-maxphys-base, tls-earlyentropy-base, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, phil-wifi-20191119, phil-wifi-20190609, phil-wifi, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9-3-RELEASE, netbsd-9-2-RELEASE, netbsd-9-1-RELEASE, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, netbsd-10-base, netbsd-10-0-RC6, netbsd-10-0-RC5, netbsd-10-0-RC4, netbsd-10-0-RC3, netbsd-10-0-RC2, netbsd-10-0-RC1, netbsd-10, matt-nb8-mediatek-base, matt-nb8-mediatek, localcount-20160914, is-mlppp-base, is-mlppp, cjep_sun2x-base1, cjep_sun2x-base, cjep_sun2x, cjep_staticlib_x-base1, cjep_staticlib_x-base, cjep_staticlib_x, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, HEAD
Changes since 1.3: +2 -1 lines

Put missing END() markers to set ELF symbol size.

/*
 * Written by J.T. Conklin <jtc@NetBSD.org>.
 * Public domain.
 */

#include <machine/asm.h>

#if defined(LIBC_SCCS)
	RCSID("$NetBSD: swab.S,v 1.4 2014/05/22 15:01:57 uebayasi Exp $")
#endif

#define LOAD_SWAP_STORE_WORD \
	lodsw	; \
	xchgb	%al,%ah ; \
	stosw

ENTRY(swab)
	xchgq	%rdi,%rsi
	cld				# set direction forward

	shrq	$1,%rdx
	testq	$7,%rdx			# copy first group of 1 to 7 words
	jz	L2			# while swapping alternate bytes.
L1:	lodsw
	rorw	$8,%ax
	stosw
	decq	%rdx
	testq	$7,%rdx
	jnz	L1

L2:	shrq	$3,%rdx			# copy remainder 8 words at a time
	jz	L4			# while swapping alternate bytes.
L3:
	LOAD_SWAP_STORE_WORD
	LOAD_SWAP_STORE_WORD
	LOAD_SWAP_STORE_WORD
	LOAD_SWAP_STORE_WORD
	LOAD_SWAP_STORE_WORD
	LOAD_SWAP_STORE_WORD
	LOAD_SWAP_STORE_WORD
	LOAD_SWAP_STORE_WORD

	decq	%rdx
	jnz	L3
L4:
	ret
END(swab)