110 lines
2.4 KiB
NASM
110 lines
2.4 KiB
NASM
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dnl ARM mpn_submul_1 -- Multiply a limb vector with a limb and subtract the
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dnl result from a second limb vector.
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dnl Copyright 1998, 2000, 2001, 2003 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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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 the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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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 Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C cycles/limb
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C StrongARM: 7.75-9.75 (dependent on vl value)
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C XScale: 8-9 (dependent on vl value, estimated)
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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(`vl',`r3')
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define(`rl',`r12')
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define(`ul',`r6')
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define(`r',`lr')
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ASM_START()
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PROLOGUE(mpn_submul_1)
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stmfd sp!, { r4-r6, lr }
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subs r4, r0, r0 C clear r4, set cy
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tst n, #1
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beq L(skip1)
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ldr ul, [up], #4
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ldr rl, [rp, #0]
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umull r5, r4, ul, vl
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subs r, rl, r5
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str r, [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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ldr ul, [up], #4
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ldr rl, [rp, #0]
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mov r5, #0
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umlal r4, r5, ul, vl
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ldr ul, [up], #4
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sbcs r, rl, r4
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ldr rl, [rp, #4]
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mov r4, #0
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umlal r5, r4, ul, vl
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str r, [rp], #4
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sbcs r, rl, r5
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str r, [rp], #4
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L(skip2):
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bics r, n, #3
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beq L(return)
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ldr ul, [up], #4
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ldr rl, [rp, #0]
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mov r5, #0
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umlal r4, r5, ul, vl
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b L(in)
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L(loop):
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ldr ul, [up], #4
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sbcs r, rl, r5
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ldr rl, [rp, #4]
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mov r5, #0
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umlal r4, r5, ul, vl
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str r, [rp], #4
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L(in): ldr ul, [up], #4
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sbcs r, rl, r4
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ldr rl, [rp, #4]
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mov r4, #0
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umlal r5, r4, ul, vl
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str r, [rp], #4
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ldr ul, [up], #4
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sbcs r, rl, r5
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ldr rl, [rp, #4]
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mov r5, #0
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umlal r4, r5, ul, vl
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str r, [rp], #4
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ldr ul, [up], #4
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sbcs r, rl, r4
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ldr rl, [rp, #4]
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mov r4, #0
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umlal r5, r4, ul, vl
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str r, [rp], #4
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sub n, n, #4
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bics r, n, #3
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bne L(loop)
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sbcs r, rl, r5
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str r, [rp], #4
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L(return):
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sbc r0, r0, r0
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sub r0, r4, r0
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ldmfd sp!, { r4-r6, pc }
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EPILOGUE(mpn_submul_1)
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