1dnl Alpha auxiliary for longlong.h's count_leading_zeros 2 3dnl Copyright 1997, 2000, 2002 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6dnl 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of either: 9dnl 10dnl * the GNU Lesser General Public License as published by the Free 11dnl Software Foundation; either version 3 of the License, or (at your 12dnl option) any later version. 13dnl 14dnl or 15dnl 16dnl * the GNU General Public License as published by the Free Software 17dnl Foundation; either version 2 of the License, or (at your option) any 18dnl later version. 19dnl 20dnl or both in parallel, as here. 21dnl 22dnl The GNU MP Library is distributed in the hope that it will be useful, but 23dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 24dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 25dnl for more details. 26dnl 27dnl You should have received copies of the GNU General Public License and the 28dnl GNU Lesser General Public License along with the GNU MP Library. If not, 29dnl see https://www.gnu.org/licenses/. 30 31include(`../config.m4') 32 33 34ASM_START() 35EXTERN(__clz_tab) 36PROLOGUE(mpn_count_leading_zeros,gp) 37 cmpbge r31, r16, r1 38 LEA(r3,__clz_tab) 39 sra r1, 1, r1 40 xor r1, 127, r1 41 srl r16, 1, r16 42 addq r1, r3, r1 43 ldq_u r0, 0(r1) 44 lda r2, 64 45 extbl r0, r1, r0 46 s8subl r0, 8, r0 47 srl r16, r0, r16 48 addq r16, r3, r16 49 ldq_u r1, 0(r16) 50 extbl r1, r16, r1 51 subq r2, r1, r2 52 subq r2, r0, r0 53 ret r31, (r26),1 54EPILOGUE(mpn_count_leading_zeros) 55ASM_END() 56