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129 lines
2.6 KiB
ArmAsm
129 lines
2.6 KiB
ArmAsm
/* AMD64 __mpn_mul_1 -- Multiply a limb vector with a limb and store
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the result in a second limb vector.
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Copyright (C) 2003-2024 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not,
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see <https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include "asm-syntax.h"
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#define rp %rdi
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#define up %rsi
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#define n_param %rdx
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#define vl %rcx
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#define n %r11
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.text
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ENTRY (__mpn_mul_1)
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push %rbx
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cfi_adjust_cfa_offset (8)
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cfi_rel_offset (%rbx, 0)
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xor %r10, %r10
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mov (up), %rax /* read first u limb early */
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mov n_param, %rbx /* move away n from rdx, mul uses it */
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mul vl
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mov %rbx, %r11
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add %r10, %rax
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adc $0, %rdx
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and $3, %ebx
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jz L(b0)
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cmp $2, %ebx
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jz L(b2)
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jg L(b3)
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L(b1): dec n
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jne L(gt1)
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mov %rax, (rp)
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jmp L(ret)
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L(gt1): lea 8(up,n,8), up
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lea -8(rp,n,8), rp
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neg n
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xor %r10, %r10
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xor %ebx, %ebx
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mov %rax, %r9
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mov (up,n,8), %rax
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mov %rdx, %r8
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jmp L(L1)
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L(b0): lea (up,n,8), up
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lea -16(rp,n,8), rp
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neg n
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xor %r10, %r10
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mov %rax, %r8
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mov %rdx, %rbx
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jmp L(L0)
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L(b3): lea -8(up,n,8), up
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lea -24(rp,n,8), rp
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neg n
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mov %rax, %rbx
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mov %rdx, %r10
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jmp L(L3)
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L(b2): lea -16(up,n,8), up
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lea -32(rp,n,8), rp
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neg n
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xor %r8, %r8
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xor %ebx, %ebx
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mov %rax, %r10
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mov 24(up,n,8), %rax
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mov %rdx, %r9
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jmp L(L2)
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.p2align 4
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L(top): mov %r10, (rp,n,8)
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add %rax, %r9
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mov (up,n,8), %rax
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adc %rdx, %r8
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mov $0, %r10d
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L(L1): mul vl
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mov %r9, 8(rp,n,8)
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add %rax, %r8
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adc %rdx, %rbx
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L(L0): mov 8(up,n,8), %rax
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mul vl
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mov %r8, 16(rp,n,8)
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add %rax, %rbx
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adc %rdx, %r10
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L(L3): mov 16(up,n,8), %rax
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mul vl
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mov %rbx, 24(rp,n,8)
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mov $0, %r8d # zero
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mov %r8, %rbx # zero
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add %rax, %r10
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mov 24(up,n,8), %rax
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mov %r8, %r9 # zero
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adc %rdx, %r9
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L(L2): mul vl
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add $4, n
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js L(top)
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mov %r10, (rp,n,8)
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add %rax, %r9
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adc %r8, %rdx
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mov %r9, 8(rp,n,8)
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add %r8, %rdx
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L(ret): mov %rdx, %rax
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pop %rbx
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cfi_adjust_cfa_offset (-8)
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cfi_restore (%rbx)
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ret
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END (__mpn_mul_1)
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