1dnl ARM mpn_rsh1add_n and mpn_rsh1sub_n. 2 3dnl Contributed to the GNU project by Torbjörn Granlund. 4 5dnl Copyright 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 3.64-3.7 41C Cortex-A15 2.5 42 43C TODO 44C * Not optimised. 45 46define(`rp', `r0') 47define(`up', `r1') 48define(`vp', `r2') 49define(`n', `r3') 50 51ifdef(`OPERATION_rsh1add_n', ` 52 define(`ADDSUB', adds) 53 define(`ADDSUBC', adcs) 54 define(`RSTCY', `cmn $1, $1') 55 define(`func', mpn_rsh1add_n) 56 define(`func_nc', mpn_rsh1add_nc)') 57ifdef(`OPERATION_rsh1sub_n', ` 58 define(`ADDSUB', subs) 59 define(`ADDSUBC', sbcs) 60 define(`RSTCY', 61 `mvn $2, #0x80000000 62 cmp $2, $1') 63 define(`func', mpn_rsh1sub_n) 64 define(`func_nc', mpn_rsh1sub_nc)') 65 66MULFUNC_PROLOGUE(mpn_rsh1add_n mpn_rsh1sub_n) 67 68ASM_START() 69PROLOGUE(func) 70 push {r4-r11} 71 ldr r4, [up], #4 72 ldr r8, [vp], #4 73 ADDSUB r4, r4, r8 74 movs r12, r7, rrx 75 and r11, r4, #1 C return value 76 subs n, n, #4 77 blo L(end) 78 79L(top): ldmia up!, {r5,r6,r7} 80 ldmia vp!, {r8,r9,r10} 81 cmn r12, r12 82 ADDSUBC r5, r5, r8 83 ADDSUBC r6, r6, r9 84 ADDSUBC r7, r7, r10 85 movs r12, r7, rrx 86 movs r6, r6, rrx 87 movs r5, r5, rrx 88 movs r4, r4, rrx 89 subs n, n, #3 90 stmia rp!, {r4,r5,r6} 91 mov r4, r7 92 bhs L(top) 93 94L(end): cmn n, #2 95 bls L(e2) 96 ldm up, {r5,r6} 97 ldm vp, {r8,r9} 98 cmn r12, r12 99 ADDSUBC r5, r5, r8 100 ADDSUBC r6, r6, r9 101 movs r12, r6, rrx 102 movs r5, r5, rrx 103 movs r4, r4, rrx 104 stmia rp!, {r4,r5} 105 mov r4, r6 106 b L(e1) 107 108L(e2): bne L(e1) 109 ldr r5, [up, #0] 110 ldr r8, [vp, #0] 111 cmn r12, r12 112 ADDSUBC r5, r5, r8 113 movs r12, r5, rrx 114 movs r4, r4, rrx 115 str r4, [rp], #4 116 mov r4, r5 117 118L(e1): RSTCY( r12, r1) 119 mov r4, r4, rrx 120 str r4, [rp, #0] 121 mov r0, r11 122 pop {r4-r11} 123 ret r14 124EPILOGUE() 125