1dnl ARM mpn_cnd_add_n, mpn_cnd_sub_n 2 3dnl Copyright 2012, 2013 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6dnl 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of either: 9dnl 10dnl * the GNU Lesser General Public License as published by the Free 11dnl Software Foundation; either version 3 of the License, or (at your 12dnl option) any later version. 13dnl 14dnl or 15dnl 16dnl * the GNU General Public License as published by the Free Software 17dnl Foundation; either version 2 of the License, or (at your option) any 18dnl later version. 19dnl 20dnl or both in parallel, as here. 21dnl 22dnl The GNU MP Library is distributed in the hope that it will be useful, but 23dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 24dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 25dnl for more details. 26dnl 27dnl You should have received copies of the GNU General Public License and the 28dnl GNU Lesser General Public License along with the GNU MP Library. If not, 29dnl see https://www.gnu.org/licenses/. 30 31include(`../config.m4') 32 33C cycles/limb 34C StrongARM ? 35C XScale ? 36C Cortex-A7 ? 37C Cortex-A8 ? 38C Cortex-A9 3 39C Cortex-A15 2.5 40 41define(`cnd', `r0') 42define(`rp', `r1') 43define(`up', `r2') 44define(`vp', `r3') 45 46define(`n', `r12') 47 48 49ifdef(`OPERATION_cnd_add_n', ` 50 define(`ADDSUB', adds) 51 define(`ADDSUBC', adcs) 52 define(`INITCY', `cmn r0, #0') 53 define(`RETVAL', `adc r0, n, #0') 54 define(func, mpn_cnd_add_n)') 55ifdef(`OPERATION_cnd_sub_n', ` 56 define(`ADDSUB', subs) 57 define(`ADDSUBC', sbcs) 58 define(`INITCY', `cmp r0, #0') 59 define(`RETVAL', `adc r0, n, #0 60 rsb r0, r0, #1') 61 define(func, mpn_cnd_sub_n)') 62 63MULFUNC_PROLOGUE(mpn_cnd_add_n mpn_cnd_sub_n) 64 65ASM_START() 66PROLOGUE(func) 67 push {r4-r11} 68 ldr n, [sp, #32] 69 70 cmp cnd, #1 71 sbc cnd, cnd, cnd C conditionally set to 0xffffffff 72 73 INITCY C really only needed for n = 0 (mod 4) 74 75 ands r4, n, #3 76 beq L(top) 77 cmp r4, #2 78 bcc L(b1) 79 beq L(b2) 80 81L(b3): ldm vp!, {r4,r5,r6} 82 ldm up!, {r8,r9,r10} 83 bic r4, r4, cnd 84 bic r5, r5, cnd 85 bic r6, r6, cnd 86 ADDSUB r8, r8, r4 87 ADDSUBC r9, r9, r5 88 ADDSUBC r10, r10, r6 89 stm rp!, {r8,r9,r10} 90 sub n, n, #3 91 teq n, #0 92 bne L(top) 93 b L(end) 94 95L(b2): ldm vp!, {r4,r5} 96 ldm up!, {r8,r9} 97 bic r4, r4, cnd 98 bic r5, r5, cnd 99 ADDSUB r8, r8, r4 100 ADDSUBC r9, r9, r5 101 stm rp!, {r8,r9} 102 sub n, n, #2 103 teq n, #0 104 bne L(top) 105 b L(end) 106 107L(b1): ldr r4, [vp], #4 108 ldr r8, [up], #4 109 bic r4, r4, cnd 110 ADDSUB r8, r8, r4 111 str r8, [rp], #4 112 sub n, n, #1 113 teq n, #0 114 beq L(end) 115 116L(top): ldm vp!, {r4,r5,r6,r7} 117 ldm up!, {r8,r9,r10,r11} 118 bic r4, r4, cnd 119 bic r5, r5, cnd 120 bic r6, r6, cnd 121 bic r7, r7, cnd 122 ADDSUBC r8, r8, r4 123 ADDSUBC r9, r9, r5 124 ADDSUBC r10, r10, r6 125 ADDSUBC r11, r11, r7 126 sub n, n, #4 127 stm rp!, {r8,r9,r10,r11} 128 teq n, #0 129 bne L(top) 130 131L(end): RETVAL 132 pop {r4-r11} 133 ret r14 134EPILOGUE() 135