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131 lines
2.8 KiB
NASM
131 lines
2.8 KiB
NASM
dnl S/390-64 mpn_mul_basecase.
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dnl Copyright 2011 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 z900 ?
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C z990 23
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C z9 ?
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C z10 28
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C z196 ?
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C TODO
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C * Perhaps add special case for un <= 2.
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C * Replace loops by faster code. The mul_1 and addmul_1 loops could be sped
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C up by about 10%.
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C INPUT PARAMETERS
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define(`rp', `%r2')
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define(`up', `%r3')
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define(`un', `%r4')
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define(`vp', `%r5')
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define(`vn', `%r6')
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define(`zero', `%r8')
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ASM_START()
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PROLOGUE(mpn_mul_basecase)
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cghi un, 2
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jhe L(ge2)
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C un = vn = 1
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lg %r1, 0(vp)
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mlg %r0, 0(up)
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stg %r1, 0(rp)
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stg %r0, 8(rp)
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br %r14
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L(ge2): C jne L(gen)
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L(gen):
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C mul_1 =======================================================================
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stmg %r6, %r12, 48(%r15)
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lghi zero, 0
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aghi un, -1
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lg %r7, 0(vp)
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lg %r11, 0(up)
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lghi %r12, 8 C init index register
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mlgr %r10, %r7
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lgr %r9, un
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stg %r11, 0(rp)
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cr %r15, %r15 C clear carry flag
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L(tm): lg %r1, 0(%r12,up)
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mlgr %r0, %r7
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alcgr %r1, %r10
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lgr %r10, %r0 C copy high part to carry limb
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stg %r1, 0(%r12,rp)
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la %r12, 8(%r12)
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brctg %r9, L(tm)
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alcgr %r0, zero
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stg %r0, 0(%r12,rp)
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C addmul_1 loop ===============================================================
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aghi vn, -1
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je L(outer_end)
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L(outer_loop):
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la rp, 8(rp) C rp += 1
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la vp, 8(vp) C up += 1
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lg %r7, 0(vp)
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lg %r11, 0(up)
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lghi %r12, 8 C init index register
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mlgr %r10, %r7
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lgr %r9, un
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alg %r11, 0(rp)
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stg %r11, 0(rp)
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L(tam): lg %r1, 0(%r12,up)
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lg %r11, 0(%r12,rp)
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mlgr %r0, %r7
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alcgr %r1, %r11
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alcgr %r0, zero
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algr %r1, %r10
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lgr %r10, %r0
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stg %r1, 0(%r12,rp)
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la %r12, 8(%r12)
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brctg %r9, L(tam)
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alcgr %r0, zero
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stg %r0, 0(%r12,rp)
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brctg vn, L(outer_loop)
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L(outer_end):
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lmg %r6, %r12, 48(%r15)
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br %r14
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EPILOGUE()
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