| dnl PowerPC-32 mpn_add_n and mpn_sub_n. |
| |
| dnl Copyright 2002, 2005, 2007 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') |
| |
| C cycles/limb |
| C 603e: ? |
| C 604e: ? old: 3.25 |
| C 75x (G3): ? old: 3.5 |
| C 7400,7410 (G4): 3.25 |
| C 744x,745x (G4+): 4 |
| C power4/ppc970: ? old: 2.0 |
| C power5: ? old: 2.5 |
| |
| C INPUT PARAMETERS |
| define(`rp', `r3') |
| define(`up', `r4') |
| define(`vp', `r5') |
| define(`n', `r6') |
| define(`cy', `r7') |
| |
| ifdef(`OPERATION_add_n', ` |
| define(ADCSBC, adde) |
| define(func, mpn_add_n) |
| define(func_nc, mpn_add_nc) |
| define(IFADD, `$1') |
| define(IFSUB, `')') |
| ifdef(`OPERATION_sub_n', ` |
| define(ADCSBC, subfe) |
| define(func, mpn_sub_n) |
| define(func_nc, mpn_sub_nc) |
| define(IFADD, `') |
| define(IFSUB, `$1')') |
| |
| MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc) |
| |
| ASM_START() |
| |
| PROLOGUE(func_nc) |
| IFADD(` addic r0, cy, -1') C set carry from argument |
| IFSUB(` subfic r0, cy, 0') C set carry from argument |
| b L(ent) |
| EPILOGUE() |
| |
| PROLOGUE(func) |
| IFADD(` addic r0, n, 0') C clear carry |
| IFSUB(` addic r0, n, -1') C set carry |
| L(ent): andi. r0, n, 3 |
| addi r3, r3, -12 |
| addi n, n, 1 |
| cmpwi cr7, r0, 2 |
| srwi r0, n, 2 |
| sub r4, r4, r3 |
| sub r5, r5, r3 |
| mtctr r0 |
| bne cr0, L(n00) |
| |
| lwzx r7, r4, r3 C n = 4, 8, 12, ... |
| lwzx r8, r5, r3 |
| addi r3, r3, 4 |
| lwzx r9, r4, r3 |
| ADCSBC r7, r8, r7 |
| lwzx r10, r5, r3 |
| addi r3, r3, 4 |
| b L(00) |
| |
| L(n00): bge cr7, L(n01) |
| cmpwi cr0, r0, 0 C n = 1, 5, 9, 13, ... |
| lwzx r0, r4, r3 |
| lwzx r6, r5, r3 |
| addi r3, r3, 4 |
| ADCSBC r0, r6, r0 |
| ble L(ret) |
| L(gt1): lwzx r7, r4, r3 |
| lwzx r8, r5, r3 |
| addi r3, r3, 4 |
| b L(01) |
| |
| L(n10): |
| lwzx r9, r4, r3 C n = 3, 7, 11, 15, ... |
| lwzx r10, r5, r3 |
| addi r3, r3, 4 |
| lwzx r11, r4, r3 |
| ADCSBC r9, r10, r9 |
| lwzx r12, r5, r3 |
| addi r3, r3, 4 |
| b L(11) |
| |
| L(n01): bne cr7, L(n10) |
| cmpwi cr0, r0, 0 C n = 2, 6, 10, 14, ... |
| lwzx r11, r4, r3 |
| lwzx r12, r5, r3 |
| addi r3, r3, 4 |
| lwzx r0, r4, r3 |
| ADCSBC r11, r12, r11 |
| lwzx r6, r5, r3 |
| addi r3, r3, 4 |
| ble cr0, L(end) |
| |
| |
| L(lp): lwzx r7, r4, r3 |
| ADCSBC r0, r6, r0 |
| lwzx r8, r5, r3 |
| stwu r11, 4(r3) |
| L(01): lwzx r9, r4, r3 |
| ADCSBC r7, r8, r7 |
| lwzx r10, r5, r3 |
| stwu r0, 4(r3) |
| L(00): lwzx r11, r4, r3 |
| ADCSBC r9, r10, r9 |
| lwzx r12, r5, r3 |
| stwu r7, 4(r3) |
| L(11): lwzx r0, r4, r3 |
| ADCSBC r11, r12, r11 |
| lwzx r6, r5, r3 |
| stwu r9, 4(r3) |
| bdnz L(lp) |
| |
| L(end): ADCSBC r0, r6, r0 |
| stw r11, 4(r3) |
| L(ret): stw r0, 8(r3) |
| IFADD(` li r3, 0 ') |
| IFADD(` addze r3, r3 ') |
| IFSUB(` subfe r3, r0, r0') |
| IFSUB(` neg r3, r3') |
| blr |
| EPILOGUE() |
