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f133d007f9
Old version was from 2012-05-06, 6.1.2 is from 2016-12-16 A lot of support for newer processors and speedups since then See gmp/NEWS for details
96 lines
2.2 KiB
NASM
96 lines
2.2 KiB
NASM
dnl ARM mpn_lshiftc.
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dnl Contributed to the GNU project by Torbjörn Granlund.
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dnl Copyright 2012 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of either:
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dnl
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dnl * the GNU Lesser General Public License as published by the Free
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dnl Software Foundation; either version 3 of the License, or (at your
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dnl option) any later version.
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dnl
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dnl or
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dnl
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dnl * the GNU General Public License as published by the Free Software
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dnl Foundation; either version 2 of the License, or (at your option) any
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dnl later version.
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dnl
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dnl or both in parallel, as here.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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dnl for more details.
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dnl
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dnl You should have received copies of the GNU General Public License and the
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dnl GNU Lesser General Public License along with the GNU MP Library. If not,
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dnl see https://www.gnu.org/licenses/.
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include(`../config.m4')
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C cycles/limb
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C StrongARM ?
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C XScale ?
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C Cortex-A7 ?
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C Cortex-A8 ?
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C Cortex-A9 4.0
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C Cortex-A15 ?
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define(`rp', `r0')
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define(`up', `r1')
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define(`n', `r2')
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define(`cnt', `r3')
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define(`tnc', `r12')
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ASM_START()
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PROLOGUE(mpn_lshiftc)
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add up, up, n, lsl #2
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push {r4, r6, r7, r8}
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ldr r4, [up, #-4]!
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add rp, rp, n, lsl #2
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rsb tnc, cnt, #32
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mvn r6, r4
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mov r7, r6, lsl cnt
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tst n, #1
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beq L(evn) C n even
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L(odd): subs n, n, #2
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bcc L(1) C n = 1
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ldr r8, [up, #-4]!
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mvn r8, r8
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b L(mid)
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L(evn): ldr r6, [up, #-4]!
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mvn r6, r6
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subs n, n, #2
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beq L(end)
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L(top): ldr r8, [up, #-4]!
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orr r7, r7, r6, lsr tnc
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str r7, [rp, #-4]!
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mvn r8, r8
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mov r7, r6, lsl cnt
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L(mid): ldr r6, [up, #-4]!
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orr r7, r7, r8, lsr tnc
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str r7, [rp, #-4]!
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mvn r6, r6
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mov r7, r8, lsl cnt
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subs n, n, #2
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bgt L(top)
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L(end): orr r7, r7, r6, lsr tnc
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str r7, [rp, #-4]!
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mov r7, r6, lsl cnt
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L(1): mvn r6, #0
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orr r7, r7, r6, lsr tnc
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str r7, [rp, #-4]
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mov r0, r4, lsr tnc
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pop {r4, r6, r7, r8}
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ret r14
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EPILOGUE()
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