1dnl ARM mpn_add_n and mpn_sub_n 2 3dnl Contributed to the GNU project by Robert Harley. 4 5dnl Copyright 1997, 2000, 2001, 2012 Free Software Foundation, Inc. 6 7dnl This file is part of the GNU MP Library. 8dnl 9dnl The GNU MP Library is free software; you can redistribute it and/or modify 10dnl it under the terms of either: 11dnl 12dnl * the GNU Lesser General Public License as published by the Free 13dnl Software Foundation; either version 3 of the License, or (at your 14dnl option) any later version. 15dnl 16dnl or 17dnl 18dnl * the GNU General Public License as published by the Free Software 19dnl Foundation; either version 2 of the License, or (at your option) any 20dnl later version. 21dnl 22dnl or both in parallel, as here. 23dnl 24dnl The GNU MP Library is distributed in the hope that it will be useful, but 25dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 26dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 27dnl for more details. 28dnl 29dnl You should have received copies of the GNU General Public License and the 30dnl GNU Lesser General Public License along with the GNU MP Library. If not, 31dnl see https://www.gnu.org/licenses/. 32 33include(`../config.m4') 34 35C cycles/limb 36C StrongARM ? 37C XScale ? 38C Cortex-A7 ? 39C Cortex-A8 ? 40C Cortex-A9 2.5 slightly fluctuating 41C Cortex-A15 2.25 42 43define(`rp', `r0') 44define(`up', `r1') 45define(`vp', `r2') 46define(`n', `r3') 47 48ifdef(`OPERATION_add_n', ` 49 define(`ADDSUB', adds) 50 define(`ADDSUBC', adcs) 51 define(`CLRCY', `cmn r0, #0') 52 define(`SETCY', `cmp $1, #1') 53 define(`RETVAL', `adc r0, n, #0') 54 define(`func', mpn_add_n) 55 define(`func_nc', mpn_add_nc)') 56ifdef(`OPERATION_sub_n', ` 57 define(`ADDSUB', subs) 58 define(`ADDSUBC', sbcs) 59 define(`CLRCY', `cmp r0, r0') 60 define(`SETCY', `rsbs $1, $1, #0') 61 define(`RETVAL', `sbc r0, r0, r0 62 and r0, r0, #1') 63 define(`func', mpn_sub_n) 64 define(`func_nc', mpn_sub_nc)') 65 66MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc) 67 68ASM_START() 69PROLOGUE(func_nc) 70 ldr r12, [sp, #0] 71 stmfd sp!, { r8, r9, lr } 72 SETCY( r12) 73 b L(ent) 74EPILOGUE() 75PROLOGUE(func) 76 stmfd sp!, { r8, r9, lr } 77 CLRCY( r12) 78L(ent): tst n, #1 79 beq L(skip1) 80 ldr r12, [up], #4 81 ldr lr, [vp], #4 82 ADDSUBC r12, r12, lr 83 str r12, [rp], #4 84L(skip1): 85 tst n, #2 86 beq L(skip2) 87 ldmia up!, { r8, r9 } 88 ldmia vp!, { r12, lr } 89 ADDSUBC r8, r8, r12 90 ADDSUBC r9, r9, lr 91 stmia rp!, { r8, r9 } 92L(skip2): 93 bics n, n, #3 94 beq L(rtn) 95 stmfd sp!, { r4, r5, r6, r7 } 96 97L(top): ldmia up!, { r4, r5, r6, r7 } 98 ldmia vp!, { r8, r9, r12, lr } 99 ADDSUBC r4, r4, r8 100 sub n, n, #4 101 ADDSUBC r5, r5, r9 102 ADDSUBC r6, r6, r12 103 ADDSUBC r7, r7, lr 104 stmia rp!, { r4, r5, r6, r7 } 105 teq n, #0 106 bne L(top) 107 108 ldmfd sp!, { r4, r5, r6, r7 } 109 110L(rtn): RETVAL 111 ldmfd sp!, { r8, r9, pc } 112EPILOGUE() 113