dnl AMD64 mpn_copyi optimised for CPUs with fast SSE copying and SSSE3. dnl Copyright 2012, 2013, 2015 Free Software Foundation, Inc. dnl Contributed to the GNU project by Torbjörn Granlund. dnl This file is part of the GNU MP Library. dnl dnl The GNU MP Library is free software; you can redistribute it and/or modify dnl it under the terms of either: dnl dnl * the GNU Lesser General Public License as published by the Free dnl Software Foundation; either version 3 of the License, or (at your dnl option) any later version. dnl dnl or dnl dnl * the GNU General Public License as published by the Free Software dnl Foundation; either version 2 of the License, or (at your option) any dnl later version. dnl dnl or both in parallel, as here. dnl dnl The GNU MP Library is distributed in the hope that it will be useful, but dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License dnl for more details. dnl dnl You should have received copies of the GNU General Public License and the dnl GNU Lesser General Public License along with the GNU MP Library. If not, dnl see https://www.gnu.org/licenses/. include(`../config.m4') C cycles/limb cycles/limb cycles/limb good C aligned unaligned best seen for cpu? C AMD K8,K9 2.0 illop 1.0/1.0 N C AMD K10 0.85 illop Y/N C AMD bull 0.70 0.66 Y C AMD pile 0.68 0.66 Y C AMD steam ? ? C AMD excavator ? ? C AMD bobcat 1.97 8.16 1.5/1.5 N C AMD jaguar 0.77 0.93 0.65/opt N/Y C Intel P4 2.26 illop Y/N C Intel core 0.52 0.64 opt/opt Y C Intel NHM 0.52 0.71 opt/opt Y C Intel SBR 0.51 0.54 opt/0.51 Y C Intel IBR 0.50 0.54 opt/opt Y C Intel HWL 0.50 0.51 opt/opt Y C Intel BWL 0.55 0.55 opt/opt Y C Intel atom 1.16 1.61 opt/opt Y C Intel SLM 1.02 1.07 opt/opt Y C VIA nano 1.09 1.08 opt/opt Y C We use only 16-byte operations, except for unaligned top-most and bottom-most C limbs. We use the SSSE3 palignr instruction when rp - up = 8 (mod 16). That C instruction is better adapted to mpn_copyd's needs, we need to contort the C code to use it here. C C For operands of < COPYI_SSE_THRESHOLD limbs, we use a plain 64-bit loop, C taken from the x86_64 default code. C INPUT PARAMETERS define(`rp', `%rdi') define(`up', `%rsi') define(`n', `%rdx') C There are three instructions for loading an aligned 128-bit quantity. We use C movaps, since it has the shortest coding. dnl define(`movdqa', ``movaps'') ifdef(`COPYI_SSE_THRESHOLD',`',`define(`COPYI_SSE_THRESHOLD', 7)') ASM_START() TEXT ALIGN(64) PROLOGUE(mpn_copyi) FUNC_ENTRY(3) cmp $COPYI_SSE_THRESHOLD, n jbe L(bc) test $8, R8(rp) C is rp 16-byte aligned? jz L(rp_aligned) C jump if rp aligned movsq C copy one limb dec n L(rp_aligned): test $8, R8(up) jnz L(uent) ifelse(eval(COPYI_SSE_THRESHOLD >= 8),1, ` sub $8, n', ` jmp L(am)') ALIGN(16) L(atop):movdqa 0(up), %xmm0 movdqa 16(up), %xmm1 movdqa 32(up), %xmm2 movdqa 48(up), %xmm3 lea 64(up), up movdqa %xmm0, (rp) movdqa %xmm1, 16(rp) movdqa %xmm2, 32(rp) movdqa %xmm3, 48(rp) lea 64(rp), rp L(am): sub $8, n jnc L(atop) test $4, R8(n) jz 1f movdqa (up), %xmm0 movdqa 16(up), %xmm1 lea 32(up), up movdqa %xmm0, (rp) movdqa %xmm1, 16(rp) lea 32(rp), rp 1: test $2, R8(n) jz 1f movdqa (up), %xmm0 lea 16(up), up movdqa %xmm0, (rp) lea 16(rp), rp 1: test $1, R8(n) jz 1f mov (up), %r8 mov %r8, (rp) 1: FUNC_EXIT() ret L(uent): C Code handling up - rp = 8 (mod 16) cmp $16, n jc L(ued0) IFDOS(` add $-56, %rsp ') IFDOS(` movdqa %xmm6, (%rsp) ') IFDOS(` movdqa %xmm7, 16(%rsp) ') IFDOS(` movdqa %xmm8, 32(%rsp) ') movaps 120(up), %xmm7 movaps 104(up), %xmm6 movaps 88(up), %xmm5 movaps 72(up), %xmm4 movaps 56(up), %xmm3 movaps 40(up), %xmm2 lea 128(up), up sub $32, n jc L(ued1) ALIGN(16) L(utop):movaps -104(up), %xmm1 sub $16, n movaps -120(up), %xmm0 palignr($8, %xmm6, %xmm7) movaps -136(up), %xmm8 movdqa %xmm7, 112(rp) palignr($8, %xmm5, %xmm6) movaps 120(up), %xmm7 movdqa %xmm6, 96(rp) palignr($8, %xmm4, %xmm5) movaps 104(up), %xmm6 movdqa %xmm5, 80(rp) palignr($8, %xmm3, %xmm4) movaps 88(up), %xmm5 movdqa %xmm4, 64(rp) palignr($8, %xmm2, %xmm3) movaps 72(up), %xmm4 movdqa %xmm3, 48(rp) palignr($8, %xmm1, %xmm2) movaps 56(up), %xmm3 movdqa %xmm2, 32(rp) palignr($8, %xmm0, %xmm1) movaps 40(up), %xmm2 movdqa %xmm1, 16(rp) palignr($8, %xmm8, %xmm0) lea 128(up), up movdqa %xmm0, (rp) lea 128(rp), rp jnc L(utop) L(ued1):movaps -104(up), %xmm1 movaps -120(up), %xmm0 movaps -136(up), %xmm8 palignr($8, %xmm6, %xmm7) movdqa %xmm7, 112(rp) palignr($8, %xmm5, %xmm6) movdqa %xmm6, 96(rp) palignr($8, %xmm4, %xmm5) movdqa %xmm5, 80(rp) palignr($8, %xmm3, %xmm4) movdqa %xmm4, 64(rp) palignr($8, %xmm2, %xmm3) movdqa %xmm3, 48(rp) palignr($8, %xmm1, %xmm2) movdqa %xmm2, 32(rp) palignr($8, %xmm0, %xmm1) movdqa %xmm1, 16(rp) palignr($8, %xmm8, %xmm0) movdqa %xmm0, (rp) lea 128(rp), rp IFDOS(` movdqa (%rsp), %xmm6 ') IFDOS(` movdqa 16(%rsp), %xmm7 ') IFDOS(` movdqa 32(%rsp), %xmm8 ') IFDOS(` add $56, %rsp ') L(ued0):test $8, R8(n) jz 1f movaps 56(up), %xmm3 movaps 40(up), %xmm2 movaps 24(up), %xmm1 movaps 8(up), %xmm0 movaps -8(up), %xmm4 palignr($8, %xmm2, %xmm3) movdqa %xmm3, 48(rp) palignr($8, %xmm1, %xmm2) movdqa %xmm2, 32(rp) palignr($8, %xmm0, %xmm1) movdqa %xmm1, 16(rp) palignr($8, %xmm4, %xmm0) lea 64(up), up movdqa %xmm0, (rp) lea 64(rp), rp 1: test $4, R8(n) jz 1f movaps 24(up), %xmm1 movaps 8(up), %xmm0 palignr($8, %xmm0, %xmm1) movaps -8(up), %xmm3 movdqa %xmm1, 16(rp) palignr($8, %xmm3, %xmm0) lea 32(up), up movdqa %xmm0, (rp) lea 32(rp), rp 1: test $2, R8(n) jz 1f movdqa 8(up), %xmm0 movdqa -8(up), %xmm3 palignr($8, %xmm3, %xmm0) lea 16(up), up movdqa %xmm0, (rp) lea 16(rp), rp 1: test $1, R8(n) jz 1f mov (up), %r8 mov %r8, (rp) 1: FUNC_EXIT() ret C Basecase code. Needed for good small operands speed, not for C correctness as the above code is currently written. L(bc): lea -8(rp), rp sub $4, R32(n) jc L(end) ALIGN(16) L(top): mov (up), %r8 mov 8(up), %r9 lea 32(rp), rp mov 16(up), %r10 mov 24(up), %r11 lea 32(up), up mov %r8, -24(rp) mov %r9, -16(rp) ifelse(eval(COPYI_SSE_THRESHOLD >= 8),1, ` sub $4, R32(n)') mov %r10, -8(rp) mov %r11, (rp) ifelse(eval(COPYI_SSE_THRESHOLD >= 8),1, ` jnc L(top)') L(end): test $1, R8(n) jz 1f mov (up), %r8 mov %r8, 8(rp) lea 8(rp), rp lea 8(up), up 1: test $2, R8(n) jz 1f mov (up), %r8 mov 8(up), %r9 mov %r8, 8(rp) mov %r9, 16(rp) 1: FUNC_EXIT() ret EPILOGUE()