dnl  Alpha auxiliary for longlong.h's count_leading_zeros

dnl  Copyright 1997, 2000, 2002 Free Software Foundation, Inc.

dnl  This file is part of the GNU MP Library.

dnl  The GNU MP Library is free software; you can redistribute it and/or modify
dnl  it under the terms of the GNU Lesser General Public License as published
dnl  by the Free Software Foundation; either version 2.1 of the License, or (at
dnl  your option) any later version.

dnl  The GNU MP Library is distributed in the hope that it will be useful, but
dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
dnl  License for more details.

dnl  You should have received a copy of the GNU Lesser General Public License
dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write
dnl  to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
dnl  Boston, MA 02110-1301, USA.

include(`../config.m4')


ASM_START()
EXTERN(__clz_tab)
PROLOGUE(mpn_count_leading_zeros,gp)
	cmpbge	r31,  r16, r1
	LEA(r3,__clz_tab)
	sra	r1,   1,   r1
	xor	r1,   127, r1
	srl	r16,  1,   r16
	addq	r1,   r3,  r1
	ldq_u	r0,   0(r1)
	lda	r2,   64
	extbl	r0,   r1,   r0
	s8subl	r0,   8,    r0
	srl	r16,  r0,   r16
	addq	r16,  r3,   r16
	ldq_u	r1,   0(r16)
	extbl	r1,   r16,  r1
	subq	r2,   r1,   r2
	subq	r2,   r0,   r0
	ret	r31,  (r26),1
EPILOGUE(mpn_count_leading_zeros)
ASM_END()
