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Diffstat (limited to 'sysdeps/x86_64/rshift.S')
| -rw-r--r-- | sysdeps/x86_64/rshift.S | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/sysdeps/x86_64/rshift.S b/sysdeps/x86_64/rshift.S new file mode 100644 index 0000000000..ee0c8aa15c --- /dev/null +++ b/sysdeps/x86_64/rshift.S @@ -0,0 +1,62 @@ +/* AMD64 __mpn_rshift -- + Copyright (C) 2004, 2006 Free Software Foundation, Inc. + This file is part of the GNU MP Library. + + The GNU MP Library is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or (at your + option) any later version. + + The GNU MP Library is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public + License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with the GNU MP Library; see the file COPYING.LIB. If not, write to + the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, + MA 02111-1307, USA. */ + +#include "sysdep.h" +#include "asm-syntax.h" + + .text +ENTRY (__mpn_rshift) + movq (%rsi), %mm7 + movd %ecx, %mm1 + movl $64, %eax + subl %ecx, %eax + movd %eax, %mm0 + movq %mm7, %mm3 + psllq %mm0, %mm7 + movd %mm7, %rax + leaq (%rsi,%rdx,8), %rsi + leaq (%rdi,%rdx,8), %rdi + negq %rdx + addq $2, %rdx + jg L(endo) + .p2align 2 +L(loop): + movq -8(%rsi,%rdx,8), %mm6 + movq %mm6, %mm2 + psllq %mm0, %mm6 + psrlq %mm1, %mm3 + por %mm6, %mm3 + movq %mm3, -16(%rdi,%rdx,8) + je L(ende) + movq (%rsi,%rdx,8), %mm7 + movq %mm7, %mm3 + psllq %mm0, %mm7 + psrlq %mm1, %mm2 + por %mm7, %mm2 + movq %mm2, -8(%rdi,%rdx,8) + addq $2, %rdx + jle L(loop) +L(endo): + movq %mm3, %mm2 +L(ende): + psrlq %mm1, %mm2 + movq %mm2, -8(%rdi) + emms + ret +END (__mpn_rshift) |