1dnl ARM mpn_lshift. 2 3dnl Contributed to the GNU project by Torbjorn Granlund. 4 5dnl Copyright 2012 Free Software Foundation, Inc. 6 7dnl This file is part of the GNU MP Library. 8 9dnl The GNU MP Library is free software; you can redistribute it and/or modify 10dnl it under the terms of the GNU Lesser General Public License as published 11dnl by the Free Software Foundation; either version 3 of the License, or (at 12dnl your option) any later version. 13 14dnl The GNU MP Library is distributed in the hope that it will be useful, but 15dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17dnl License for more details. 18 19dnl You should have received a copy of the GNU Lesser General Public License 20dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. 21 22include(`../config.m4') 23 24C cycles/limb 25C StrongARM ? 26C XScale ? 27C Cortex-A8 ? 28C Cortex-A9 3.5 29C Cortex-A15 ? 30 31define(`rp', `r0') 32define(`up', `r1') 33define(`n', `r2') 34define(`cnt', `r3') 35define(`tnc', `r12') 36 37ASM_START() 38PROLOGUE(mpn_lshift) 39 add up, up, n, lsl #2 40 push {r4, r6, r7, r8} 41 ldr r4, [up, #-4]! 42 add rp, rp, n, lsl #2 43 rsb tnc, cnt, #32 44 45 lsl r7, r4, cnt 46 tst n, #1 47 beq L(evn) C n even 48 49L(odd): subs n, n, #2 50 bcc L(1) C n = 1 51 ldr r8, [up, #-4]! 52 b L(mid) 53 54L(evn): ldr r6, [up, #-4]! 55 subs n, n, #2 56 beq L(end) 57 58L(top): ldr r8, [up, #-4]! 59 orr r7, r7, r6, lsr tnc 60 str r7, [rp, #-4]! 61 lsl r7, r6, cnt 62L(mid): ldr r6, [up, #-4]! 63 orr r7, r7, r8, lsr tnc 64 str r7, [rp, #-4]! 65 lsl r7, r8, cnt 66 subs n, n, #2 67 bgt L(top) 68 69L(end): orr r7, r7, r6, lsr tnc 70 str r7, [rp, #-4]! 71 lsl r7, r6, cnt 72L(1): str r7, [rp, #-4] 73 lsr r0, r4, tnc 74 pop {r4, r6, r7, r8} 75ifdef(`ARM_THUMB_MODE', 76` bx r14 77',` mov pc, r14 78') 79EPILOGUE() 80