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dnl ARM mpn_add_n and mpn_sub_n
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dnl Contributed to the GNU project by Robert Harley.
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dnl Copyright 1997, 2000, 2001, 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 2.5 slightly fluctuating
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C Cortex-A15 2.25
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define(`rp', `r0')
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define(`up', `r1')
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define(`vp', `r2')
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define(`n', `r3')
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ifdef(`OPERATION_add_n', `
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define(`ADDSUB', adds)
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define(`ADDSUBC', adcs)
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define(`CLRCY', `cmn r0, #0')
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define(`SETCY', `cmp $1, #1')
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define(`RETVAL', `adc r0, n, #0')
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define(`func', mpn_add_n)
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define(`func_nc', mpn_add_nc)')
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ifdef(`OPERATION_sub_n', `
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define(`ADDSUB', subs)
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define(`ADDSUBC', sbcs)
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define(`CLRCY', `cmp r0, r0')
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define(`SETCY', `rsbs $1, $1, #0')
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define(`RETVAL', `sbc r0, r0, r0
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and r0, r0, #1')
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define(`func', mpn_sub_n)
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define(`func_nc', mpn_sub_nc)')
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MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc)
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ASM_START()
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PROLOGUE(func_nc)
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ldr r12, [sp, #0]
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stmfd sp!, { r8, r9, lr }
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SETCY( r12)
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b L(ent)
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EPILOGUE()
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PROLOGUE(func)
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stmfd sp!, { r8, r9, lr }
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CLRCY( r12)
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L(ent): tst n, #1
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beq L(skip1)
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ldr r12, [up], #4
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ldr lr, [vp], #4
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ADDSUBC r12, r12, lr
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str r12, [rp], #4
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L(skip1):
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tst n, #2
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beq L(skip2)
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ldmia up!, { r8, r9 }
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ldmia vp!, { r12, lr }
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ADDSUBC r8, r8, r12
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ADDSUBC r9, r9, lr
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stmia rp!, { r8, r9 }
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L(skip2):
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bics n, n, #3
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beq L(rtn)
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stmfd sp!, { r4, r5, r6, r7 }
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L(top): ldmia up!, { r4, r5, r6, r7 }
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ldmia vp!, { r8, r9, r12, lr }
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ADDSUBC r4, r4, r8
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sub n, n, #4
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ADDSUBC r5, r5, r9
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ADDSUBC r6, r6, r12
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ADDSUBC r7, r7, lr
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stmia rp!, { r4, r5, r6, r7 }
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teq n, #0
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bne L(top)
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ldmfd sp!, { r4, r5, r6, r7 }
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L(rtn): RETVAL
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ldmfd sp!, { r8, r9, pc }
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EPILOGUE()
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