dnl ARM mpn_copyd. dnl Contributed to the GNU project by Robert Harley and Torbjörn Granlund. dnl Copyright 2003, 2012, 2013 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 1.25-1.5 C Cortex-A15 1.25 C TODO C * Consider wider unrolling. Analogous 8-way code runs 10% faster on both A9 C and A15. But it probably slows things down for 8 <= n < a few dozen. define(`rp', `r0') define(`up', `r1') define(`n', `r2') ASM_START() PROLOGUE(mpn_copyd) mov r12, n, lsl #2 sub r12, r12, #4 add rp, rp, r12 add up, up, r12 tst n, #1 beq L(skip1) ldr r3, [up], #-4 str r3, [rp], #-4 L(skip1): tst n, #2 beq L(skip2) ldmda up!, { r3,r12 } stmda rp!, { r3,r12 } L(skip2): bics n, n, #3 beq L(rtn) push { r4-r5 } subs n, n, #4 ldmda up!, { r3,r4,r5,r12 } beq L(end) L(top): subs n, n, #4 stmda rp!, { r3,r4,r5,r12 } ldmda up!, { r3,r4,r5,r12 } bne L(top) L(end): stmda rp, { r3,r4,r5,r12 } pop { r4-r5 } L(rtn): return lr EPILOGUE() |