| dnl ARM mpn_add_n and mpn_sub_n |
| |
| dnl Contributed to the GNU project by Robert Harley. |
| |
| dnl Copyright 1997, 2000, 2001, 2012 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') |
| |
| C cycles/limb |
| C StrongARM ? |
| C XScale ? |
| C Cortex-A7 ? |
| C Cortex-A8 ? |
| C Cortex-A9 2.5 slightly fluctuating |
| C Cortex-A15 2.25 |
| |
| define(`rp', `r0') |
| define(`up', `r1') |
| define(`vp', `r2') |
| define(`n', `r3') |
| |
| ifdef(`OPERATION_add_n', ` |
| define(`ADDSUB', adds) |
| define(`ADDSUBC', adcs) |
| define(`CLRCY', `cmn r0, #0') |
| define(`SETCY', `cmp $1, #1') |
| define(`RETVAL', `adc r0, n, #0') |
| define(`func', mpn_add_n) |
| define(`func_nc', mpn_add_nc)') |
| ifdef(`OPERATION_sub_n', ` |
| define(`ADDSUB', subs) |
| define(`ADDSUBC', sbcs) |
| define(`CLRCY', `cmp r0, r0') |
| define(`SETCY', `rsbs $1, $1, #0') |
| define(`RETVAL', `sbc r0, r0, r0 |
| and r0, r0, #1') |
| define(`func', mpn_sub_n) |
| define(`func_nc', mpn_sub_nc)') |
| |
| MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc) |
| |
| ASM_START() |
| PROLOGUE(func_nc) |
| ldr r12, [sp, #0] |
| stmfd sp!, { r8, r9, lr } |
| SETCY( r12) |
| b L(ent) |
| EPILOGUE() |
| PROLOGUE(func) |
| stmfd sp!, { r8, r9, lr } |
| CLRCY( r12) |
| L(ent): tst n, #1 |
| beq L(skip1) |
| ldr r12, [up], #4 |
| ldr lr, [vp], #4 |
| ADDSUBC r12, r12, lr |
| str r12, [rp], #4 |
| L(skip1): |
| tst n, #2 |
| beq L(skip2) |
| ldmia up!, { r8, r9 } |
| ldmia vp!, { r12, lr } |
| ADDSUBC r8, r8, r12 |
| ADDSUBC r9, r9, lr |
| stmia rp!, { r8, r9 } |
| L(skip2): |
| bics n, n, #3 |
| beq L(rtn) |
| stmfd sp!, { r4, r5, r6, r7 } |
| |
| L(top): ldmia up!, { r4, r5, r6, r7 } |
| ldmia vp!, { r8, r9, r12, lr } |
| ADDSUBC r4, r4, r8 |
| sub n, n, #4 |
| ADDSUBC r5, r5, r9 |
| ADDSUBC r6, r6, r12 |
| ADDSUBC r7, r7, lr |
| stmia rp!, { r4, r5, r6, r7 } |
| teq n, #0 |
| bne L(top) |
| |
| ldmfd sp!, { r4, r5, r6, r7 } |
| |
| L(rtn): RETVAL |
| ldmfd sp!, { r8, r9, pc } |
| EPILOGUE() |
