sublsh1_n.asm revision 1.1.1.1.2.1
1 dnl AMD64 mpn_sublsh1_n -- rp[] = up[] - (vp[] << 1) 2 3 dnl Copyright 2003, 2005, 2006, 2007, 2011, 2012 Free Software Foundation, 4 dnl Inc. 5 6 dnl This file is part of the GNU MP Library. 7 8 dnl The GNU MP Library is free software; you can redistribute it and/or modify 9 dnl it under the terms of the GNU Lesser General Public License as published 10 dnl by the Free Software Foundation; either version 3 of the License, or (at 11 dnl your option) any later version. 12 13 dnl The GNU MP Library is distributed in the hope that it will be useful, but 14 dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16 dnl License for more details. 17 18 dnl You should have received a copy of the GNU Lesser General Public License 19 dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. 20 21 include(`../config.m4') 22 23 24 C cycles/limb 25 C AMD K8,K9 2.2 26 C AMD K10 2.2 27 C Intel P4 12.75 28 C Intel core2 3.45 29 C Intel corei ? 30 C Intel atom ? 31 C VIA nano 3.25 32 33 C Sometimes speed degenerates, supposedly related to that some operand 34 C alignments cause cache conflicts. 35 36 C The speed is limited by decoding/issue bandwidth. There are 26 instructions 37 C in the loop, which corresponds to 26/3/4 = 2.167 c/l. 38 39 C INPUT PARAMETERS 40 define(`rp',`%rdi') 41 define(`up',`%rsi') 42 define(`vp',`%rdx') 43 define(`n', `%rcx') 44 45 ABI_SUPPORT(DOS64) 46 ABI_SUPPORT(STD64) 47 48 ASM_START() 49 TEXT 50 ALIGN(16) 51 PROLOGUE(mpn_sublsh1_n) 52 FUNC_ENTRY(4) 53 push %rbx 54 push %rbp 55 56 mov (vp), %r8 57 mov R32(n), R32(%rax) 58 lea (rp,n,8), rp 59 lea (up,n,8), up 60 lea (vp,n,8), vp 61 neg n 62 xor R32(%rbp), R32(%rbp) 63 and $3, R32(%rax) 64 je L(b00) 65 cmp $2, R32(%rax) 66 jc L(b01) 67 je L(b10) 68 69 L(b11): add %r8, %r8 70 mov 8(vp,n,8), %r9 71 adc %r9, %r9 72 mov 16(vp,n,8), %r10 73 adc %r10, %r10 74 sbb R32(%rax), R32(%rax) C save scy 75 mov (up,n,8), %rbp 76 mov 8(up,n,8), %rbx 77 sub %r8, %rbp 78 sbb %r9, %rbx 79 mov %rbp, (rp,n,8) 80 mov %rbx, 8(rp,n,8) 81 mov 16(up,n,8), %rbp 82 sbb %r10, %rbp 83 mov %rbp, 16(rp,n,8) 84 sbb R32(%rbp), R32(%rbp) C save acy 85 add $3, n 86 jmp L(ent) 87 88 L(b10): add %r8, %r8 89 mov 8(vp,n,8), %r9 90 adc %r9, %r9 91 sbb R32(%rax), R32(%rax) C save scy 92 mov (up,n,8), %rbp 93 mov 8(up,n,8), %rbx 94 sub %r8, %rbp 95 sbb %r9, %rbx 96 mov %rbp, (rp,n,8) 97 mov %rbx, 8(rp,n,8) 98 sbb R32(%rbp), R32(%rbp) C save acy 99 add $2, n 100 jmp L(ent) 101 102 L(b01): add %r8, %r8 103 sbb R32(%rax), R32(%rax) C save scy 104 mov (up,n,8), %rbp 105 sub %r8, %rbp 106 mov %rbp, (rp,n,8) 107 sbb R32(%rbp), R32(%rbp) C save acy 108 inc n 109 L(ent): jns L(end) 110 111 ALIGN(16) 112 L(top): add R32(%rax), R32(%rax) C restore scy 113 114 mov (vp,n,8), %r8 115 L(b00): adc %r8, %r8 116 mov 8(vp,n,8), %r9 117 adc %r9, %r9 118 mov 16(vp,n,8), %r10 119 adc %r10, %r10 120 mov 24(vp,n,8), %r11 121 adc %r11, %r11 122 123 sbb R32(%rax), R32(%rax) C save scy 124 add R32(%rbp), R32(%rbp) C restore acy 125 126 mov (up,n,8), %rbp 127 mov 8(up,n,8), %rbx 128 sbb %r8, %rbp 129 sbb %r9, %rbx 130 mov %rbp, (rp,n,8) 131 mov %rbx, 8(rp,n,8) 132 mov 16(up,n,8), %rbp 133 mov 24(up,n,8), %rbx 134 sbb %r10, %rbp 135 sbb %r11, %rbx 136 mov %rbp, 16(rp,n,8) 137 mov %rbx, 24(rp,n,8) 138 139 sbb R32(%rbp), R32(%rbp) C save acy 140 add $4, n 141 js L(top) 142 143 L(end): add R32(%rbp), R32(%rax) 144 neg R32(%rax) 145 146 pop %rbp 147 pop %rbx 148 FUNC_EXIT() 149 ret 150 EPILOGUE() 151
Indexes created Sat Feb 28 05:31:39 UTC 2026