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