cntlz.asm
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上传日期:2022-08-06
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- 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 3 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. If not, see http://www.gnu.org/licenses/.
- 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()