47 lines
1.4 KiB
NASM
47 lines
1.4 KiB
NASM
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dnl Alpha auxiliary for longlong.h's count_leading_zeros
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dnl Copyright 1997, 2000, 2002 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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ASM_START()
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EXTERN(__clz_tab)
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PROLOGUE(mpn_count_leading_zeros,gp)
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cmpbge r31, r16, r1
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LEA(r3,__clz_tab)
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sra r1, 1, r1
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xor r1, 127, r1
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srl r16, 1, r16
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addq r1, r3, r1
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ldq_u r0, 0(r1)
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lda r2, 64
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extbl r0, r1, r0
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s8subl r0, 8, r0
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srl r16, r0, r16
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addq r16, r3, r16
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ldq_u r1, 0(r16)
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extbl r1, r16, r1
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subq r2, r1, r2
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subq r2, r0, r0
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ret r31, (r26),1
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EPILOGUE(mpn_count_leading_zeros)
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ASM_END()
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