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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
170 lines
3.1 KiB
NASM
170 lines
3.1 KiB
NASM
dnl S/390-64 mpn_sublsh1_n
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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 10
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C z990 5
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C z9 ?
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C z10 12
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C z196 ?
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C TODO
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C * Optimise for small n
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C * Compute RETVAL for sublsh1_n less stupidly
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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(`vp', `%r4')
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define(`n', `%r5')
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ifdef(`OPERATION_addlsh1_n',`
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define(ADSBR, algr)
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define(ADSBCR, alcgr)
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define(INITCY, `lghi %r13, -1')
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define(RETVAL, `la %r2, 2(%r1,%r13)')
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define(func, mpn_addlsh1_n)
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')
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ifdef(`OPERATION_sublsh1_n',`
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define(ADSBR, slgr)
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define(ADSBCR, slbgr)
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define(INITCY, `lghi %r13, 0')
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define(RETVAL,`dnl
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slgr %r1, %r13
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lghi %r2, 1
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algr %r2, %r1')
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define(func, mpn_sublsh1_n)
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')
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ASM_START()
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PROLOGUE(mpn_sublsh1_n)
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stmg %r6, %r13, 48(%r15)
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aghi n, 3
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lghi %r7, 3
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srlg %r0, n, 2
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ngr %r7, n C n mod 4
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je L(b1)
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cghi %r7, 2
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jl L(b2)
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jne L(b0)
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L(b3): lmg %r5, %r7, 0(up)
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la up, 24(up)
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lmg %r9, %r11, 0(vp)
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la vp, 24(vp)
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algr %r9, %r9
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alcgr %r10, %r10
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alcgr %r11, %r11
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slbgr %r1, %r1
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ADSBR %r5, %r9
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ADSBCR %r6, %r10
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ADSBCR %r7, %r11
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slbgr %r13, %r13
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stmg %r5, %r7, 0(rp)
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la rp, 24(rp)
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brctg %r0, L(top)
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j L(end)
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L(b0): lghi %r1, -1
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INITCY
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j L(top)
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L(b1): lg %r5, 0(up)
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la up, 8(up)
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lg %r9, 0(vp)
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la vp, 8(vp)
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algr %r9, %r9
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slbgr %r1, %r1
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ADSBR %r5, %r9
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slbgr %r13, %r13
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stg %r5, 0(rp)
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la rp, 8(rp)
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brctg %r0, L(top)
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j L(end)
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L(b2): lmg %r5, %r6, 0(up)
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la up, 16(up)
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lmg %r9, %r10, 0(vp)
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la vp, 16(vp)
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algr %r9, %r9
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alcgr %r10, %r10
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slbgr %r1, %r1
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ADSBR %r5, %r9
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ADSBCR %r6, %r10
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slbgr %r13, %r13
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stmg %r5, %r6, 0(rp)
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la rp, 16(rp)
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brctg %r0, L(top)
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j L(end)
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L(top): lmg %r9, %r12, 0(vp)
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la vp, 32(vp)
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aghi %r1, 1 C restore carry
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alcgr %r9, %r9
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alcgr %r10, %r10
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alcgr %r11, %r11
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alcgr %r12, %r12
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slbgr %r1, %r1 C save carry
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lmg %r5, %r8, 0(up)
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la up, 32(up)
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aghi %r13, 1 C restore carry
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ADSBCR %r5, %r9
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ADSBCR %r6, %r10
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ADSBCR %r7, %r11
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ADSBCR %r8, %r12
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slbgr %r13, %r13 C save carry
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stmg %r5, %r8, 0(rp)
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la rp, 32(rp)
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brctg %r0, L(top)
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L(end): RETVAL
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lmg %r6, %r13, 48(%r15)
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br %r14
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EPILOGUE()
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