| dnl PowerPC-64 mpn_com_n. |
| |
| dnl Copyright 2003, 2004, 2005 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 POWER3/PPC630: 1? |
| C POWER4/PPC970: 1.6 |
| |
| C TODO |
| C * 8-way unrolling brings timing down to about 1.3 cycles/limb. |
| |
| C INPUT PARAMETERS |
| C rp r3 |
| C up r4 |
| C n r5 |
| |
| ASM_START() |
| PROLOGUE(mpn_com_n) |
| rldic. r0, r5, 3, 59 C r0 = (r5 & 3) << 3; cr0 = (n == 4t)? |
| cmpldi cr6, r0, 16 C cr6 = (n cmp 4t + 2)? |
| |
| addi r5, r5, 3 C compute... |
| ifdef(`HAVE_ABI_mode32', |
| ` rldicl r5, r5, 62,34', C ...branch count |
| ` rldicl r5, r5, 62, 2') C ...branch count |
| mtctr r5 |
| |
| add r4, r4, r0 C offset up |
| add r3, r3, r0 C offset rp |
| |
| beq cr0, L(L00) |
| blt cr6, L(L01) |
| beq cr6, L(L10) |
| b L(L11) |
| |
| L(L00): addi r4, r4, 32 |
| addi r3, r3, 32 |
| |
| ALIGN(16) |
| L(oop): ld r6, -32(r4) |
| nor r6, r6, r6 |
| std r6, -32(r3) |
| L(L11): ld r6, -24(r4) |
| nor r6, r6, r6 |
| std r6, -24(r3) |
| L(L10): ld r6, -16(r4) |
| nor r6, r6, r6 |
| std r6, -16(r3) |
| L(L01): ld r6, -8(r4) |
| nor r6, r6, r6 |
| addi r4, r4, 32 |
| std r6, -8(r3) |
| addi r3, r3, 32 |
| bdnz L(oop) |
| |
| blr |
| EPILOGUE() |
