glibc/ports/sysdeps/m68k/m680x0/m68020/addmul_1.S

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/* mc68020 __mpn_addmul_1 -- Multiply a limb vector with a limb and add
the result to a second limb vector.
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Copyright (C) 1992, 1994, 1996, 1998, 2012 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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
the Free Software Foundation; either version 2.1 of the License, or (at your
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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
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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. If not, see <http://www.gnu.org/licenses/>. */
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/*
INPUT PARAMETERS
res_ptr (sp + 4)
s1_ptr (sp + 8)
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s1_size (sp + 12)
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s2_limb (sp + 16)
*/
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#include "sysdep.h"
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#include "asm-syntax.h"
TEXT
ENTRY(__mpn_addmul_1)
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#define res_ptr a0
#define s1_ptr a1
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#define s1_size d2
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#define s2_limb d4
/* Save used registers on the stack. */
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moveml R(d2)-R(d5),MEM_PREDEC(sp)
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cfi_adjust_cfa_offset (4*4)
cfi_rel_offset (R(d2), 0)
cfi_rel_offset (R(d3), 4)
cfi_rel_offset (R(d4), 8)
cfi_rel_offset (R(d5), 12)
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/* Copy the arguments to registers. Better use movem? */
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movel MEM_DISP(sp,20),R(res_ptr)
movel MEM_DISP(sp,24),R(s1_ptr)
movel MEM_DISP(sp,28),R(s1_size)
movel MEM_DISP(sp,32),R(s2_limb)
eorw #1,R(s1_size)
clrl R(d1)
clrl R(d5)
lsrl #1,R(s1_size)
bcc L(L1)
subql #1,R(s1_size)
subl R(d0),R(d0) /* (d0,cy) <= (0,0) */
L(Loop:)
movel MEM_POSTINC(s1_ptr),R(d3)
mulul R(s2_limb),R(d1):R(d3)
addxl R(d0),R(d3)
addxl R(d5),R(d1)
addl R(d3),MEM_POSTINC(res_ptr)
L(L1:) movel MEM_POSTINC(s1_ptr),R(d3)
mulul R(s2_limb),R(d0):R(d3)
addxl R(d1),R(d3)
addxl R(d5),R(d0)
addl R(d3),MEM_POSTINC(res_ptr)
dbf R(s1_size),L(Loop)
addxl R(d5),R(d0)
subl #0x10000,R(s1_size)
bcc L(Loop)
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/* Restore used registers from stack frame. */
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moveml MEM_POSTINC(sp),R(d2)-R(d5)
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cfi_adjust_cfa_offset (-4*4)
cfi_restore (R(d2))
cfi_restore (R(d3))
cfi_restore (R(d4))
cfi_restore (R(d5))
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rts
END(__mpn_addmul_1)