| 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 |
| dnl The GNU MP Library is free software; you can redistribute it and/or modify |
| dnl it under the terms of either: |
| dnl |
| dnl * the GNU Lesser General Public License as published by the Free |
| dnl Software Foundation; either version 3 of the License, or (at your |
| dnl option) any later version. |
| dnl |
| dnl or |
| dnl |
| dnl * the GNU General Public License as published by the Free Software |
| dnl Foundation; either version 2 of the License, or (at your option) any |
| dnl later version. |
| dnl |
| dnl or both in parallel, as here. |
| dnl |
| 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 General Public License |
| dnl for more details. |
| dnl |
| dnl You should have received copies of the GNU General Public License and the |
| dnl GNU Lesser General Public License along with the GNU MP Library. If not, |
| dnl see https://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() |
