diff options
Diffstat (limited to 'REORG.TODO/sysdeps/i386/rshift.S')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/rshift.S | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/rshift.S b/REORG.TODO/sysdeps/i386/rshift.S new file mode 100644 index 0000000000..cf179052b5 --- /dev/null +++ b/REORG.TODO/sysdeps/i386/rshift.S @@ -0,0 +1,105 @@ +/* i80386 __mpn_rshift -- + Copyright (C) 1992-2017 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, + see <http://www.gnu.org/licenses/>. */ + +#include "sysdep.h" +#include "asm-syntax.h" + +#define PARMS 4+12 /* space for 3 saved regs */ +#define RES PARMS +#define S RES+4 +#define SIZE S+4 +#define CNT SIZE+4 + + .text +ENTRY (__mpn_rshift) + + pushl %edi + cfi_adjust_cfa_offset (4) + pushl %esi + cfi_adjust_cfa_offset (4) + pushl %ebx + cfi_adjust_cfa_offset (4) + + movl RES(%esp),%edi + cfi_rel_offset (edi, 8) + movl S(%esp),%esi + cfi_rel_offset (esi, 4) + movl SIZE(%esp),%edx + movl CNT(%esp),%ecx + leal -4(%edi,%edx,4),%edi + leal (%esi,%edx,4),%esi + negl %edx + + movl (%esi,%edx,4),%ebx /* read least significant limb */ + cfi_rel_offset (ebx, 0) + cfi_remember_state + xorl %eax,%eax + shrdl %cl,%ebx,%eax /* compute carry limb */ + incl %edx + jz L(end) + pushl %eax /* push carry limb onto stack */ + cfi_adjust_cfa_offset (4) + testb $1,%dl + jnz L(1) /* enter loop in the middle */ + movl %ebx,%eax + + ALIGN (3) +L(oop): movl (%esi,%edx,4),%ebx /* load next higher limb */ + shrdl %cl,%ebx,%eax /* compute result limb */ + movl %eax,(%edi,%edx,4) /* store it */ + incl %edx +L(1): movl (%esi,%edx,4),%eax + shrdl %cl,%eax,%ebx + movl %ebx,(%edi,%edx,4) + incl %edx + jnz L(oop) + + shrl %cl,%eax /* compute most significant limb */ + movl %eax,(%edi) /* store it */ + + popl %eax /* pop carry limb */ + cfi_adjust_cfa_offset (-4) + + popl %ebx + cfi_adjust_cfa_offset (-4) + cfi_restore (ebx) + popl %esi + cfi_adjust_cfa_offset (-4) + cfi_restore (esi) + popl %edi + cfi_adjust_cfa_offset (-4) + cfi_restore (edi) + + ret + + cfi_restore_state +L(end): shrl %cl,%ebx /* compute most significant limb */ + movl %ebx,(%edi) /* store it */ + + popl %ebx + cfi_adjust_cfa_offset (-4) + cfi_restore (ebx) + popl %esi + cfi_adjust_cfa_offset (-4) + cfi_restore (esi) + popl %edi + cfi_adjust_cfa_offset (-4) + cfi_restore (edi) + + ret +END (__mpn_rshift) |