115 lines
2.3 KiB
ArmAsm
115 lines
2.3 KiB
ArmAsm
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/* x86-64 __mpn_rshift --
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Copyright (C) 2007-2022 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 %rdx
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#define cnt %cl
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.text
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ENTRY (__mpn_rshift)
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mov %edx, %eax
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and $3, %eax
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jne L(nb00)
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L(b00): /* n = 4, 8, 12, ... */
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mov (up), %r10
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mov 8(up), %r11
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xor %eax, %eax
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shrd %cl, %r10, %rax
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mov 16(up), %r8
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lea 8(up), up
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lea -24(rp), rp
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sub $4, n
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jmp L(00)
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L(nb00):/* n = 1, 5, 9, ... */
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cmp $2, %eax
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jae L(nb01)
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L(b01): mov (up), %r9
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xor %eax, %eax
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shrd %cl, %r9, %rax
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sub $2, n
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jb L(le1)
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mov 8(up), %r10
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mov 16(up), %r11
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lea 16(up), up
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lea -16(rp), rp
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jmp L(01)
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L(le1): shr %cl, %r9
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mov %r9, (rp)
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ret
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L(nb01):/* n = 2, 6, 10, ... */
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jne L(b11)
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L(b10): mov (up), %r8
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mov 8(up), %r9
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xor %eax, %eax
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shrd %cl, %r8, %rax
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sub $3, n
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jb L(le2)
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mov 16(up), %r10
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lea 24(up), up
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lea -8(rp), rp
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jmp L(10)
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L(le2): shrd %cl, %r9, %r8
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mov %r8, (rp)
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shr %cl, %r9
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mov %r9, 8(rp)
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ret
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.p2align 4
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L(b11): /* n = 3, 7, 11, ... */
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mov (up), %r11
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mov 8(up), %r8
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xor %eax, %eax
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shrd %cl, %r11, %rax
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mov 16(up), %r9
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lea 32(up), up
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sub $4, n
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jb L(end)
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.p2align 4
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L(top): shrd %cl, %r8, %r11
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mov -8(up), %r10
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mov %r11, (rp)
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L(10): shrd %cl, %r9, %r8
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mov (up), %r11
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mov %r8, 8(rp)
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L(01): shrd %cl, %r10, %r9
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mov 8(up), %r8
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mov %r9, 16(rp)
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L(00): shrd %cl, %r11, %r10
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mov 16(up), %r9
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mov %r10, 24(rp)
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add $32, up
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lea 32(rp), rp
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sub $4, n
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jnc L(top)
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L(end): shrd %cl, %r8, %r11
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mov %r11, (rp)
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shrd %cl, %r9, %r8
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mov %r8, 8(rp)
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shr %cl, %r9
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mov %r9, 16(rp)
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ret
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END (__mpn_rshift)
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