sub_n.asm
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- dnl SPARC mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
- dnl store difference in a third limb vector.
- dnl Copyright 1995, 1996, 2000 Free Software Foundation, Inc.
- dnl This file is part of the GNU MP Library.
- dnl The GNU MP Library is free software; you can redistribute it and/or modify
- dnl it under the terms of the GNU Lesser General Public License as published
- dnl by the Free Software Foundation; either version 3 of the License, or (at
- dnl your option) any later version.
- dnl The GNU MP Library is distributed in the hope that it will be useful, but
- dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- dnl License for more details.
- dnl You should have received a copy of the GNU Lesser General Public License
- dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
- include(`../config.m4')
- C INPUT PARAMETERS
- define(res_ptr,%o0)
- define(s1_ptr,%o1)
- define(s2_ptr,%o2)
- define(n,%o3)
- ASM_START()
- PROLOGUE(mpn_sub_n)
- xor s2_ptr,res_ptr,%g1
- andcc %g1,4,%g0
- bne L(1) C branch if alignment differs
- nop
- C ** V1a **
- andcc res_ptr,4,%g0 C res_ptr unaligned? Side effect: cy=0
- be L(v1) C if no, branch
- nop
- C Add least significant limb separately to align res_ptr and s2_ptr
- ld [s1_ptr],%g4
- add s1_ptr,4,s1_ptr
- ld [s2_ptr],%g2
- add s2_ptr,4,s2_ptr
- add n,-1,n
- subcc %g4,%g2,%o4
- st %o4,[res_ptr]
- add res_ptr,4,res_ptr
- L(v1): addx %g0,%g0,%o4 C save cy in register
- cmp n,2 C if n < 2 ...
- bl L(end2) C ... branch to tail code
- subcc %g0,%o4,%g0 C restore cy
- ld [s1_ptr+0],%g4
- addcc n,-10,n
- ld [s1_ptr+4],%g1
- ldd [s2_ptr+0],%g2
- blt L(fin1)
- subcc %g0,%o4,%g0 C restore cy
- C Add blocks of 8 limbs until less than 8 limbs remain
- L(loop1):
- subxcc %g4,%g2,%o4
- ld [s1_ptr+8],%g4
- subxcc %g1,%g3,%o5
- ld [s1_ptr+12],%g1
- ldd [s2_ptr+8],%g2
- std %o4,[res_ptr+0]
- subxcc %g4,%g2,%o4
- ld [s1_ptr+16],%g4
- subxcc %g1,%g3,%o5
- ld [s1_ptr+20],%g1
- ldd [s2_ptr+16],%g2
- std %o4,[res_ptr+8]
- subxcc %g4,%g2,%o4
- ld [s1_ptr+24],%g4
- subxcc %g1,%g3,%o5
- ld [s1_ptr+28],%g1
- ldd [s2_ptr+24],%g2
- std %o4,[res_ptr+16]
- subxcc %g4,%g2,%o4
- ld [s1_ptr+32],%g4
- subxcc %g1,%g3,%o5
- ld [s1_ptr+36],%g1
- ldd [s2_ptr+32],%g2
- std %o4,[res_ptr+24]
- addx %g0,%g0,%o4 C save cy in register
- addcc n,-8,n
- add s1_ptr,32,s1_ptr
- add s2_ptr,32,s2_ptr
- add res_ptr,32,res_ptr
- bge L(loop1)
- subcc %g0,%o4,%g0 C restore cy
- L(fin1):
- addcc n,8-2,n
- blt L(end1)
- subcc %g0,%o4,%g0 C restore cy
- C Add blocks of 2 limbs until less than 2 limbs remain
- L(loope1):
- subxcc %g4,%g2,%o4
- ld [s1_ptr+8],%g4
- subxcc %g1,%g3,%o5
- ld [s1_ptr+12],%g1
- ldd [s2_ptr+8],%g2
- std %o4,[res_ptr+0]
- addx %g0,%g0,%o4 C save cy in register
- addcc n,-2,n
- add s1_ptr,8,s1_ptr
- add s2_ptr,8,s2_ptr
- add res_ptr,8,res_ptr
- bge L(loope1)
- subcc %g0,%o4,%g0 C restore cy
- L(end1):
- subxcc %g4,%g2,%o4
- subxcc %g1,%g3,%o5
- std %o4,[res_ptr+0]
- addx %g0,%g0,%o4 C save cy in register
- andcc n,1,%g0
- be L(ret1)
- subcc %g0,%o4,%g0 C restore cy
- C Add last limb
- ld [s1_ptr+8],%g4
- ld [s2_ptr+8],%g2
- subxcc %g4,%g2,%o4
- st %o4,[res_ptr+8]
- L(ret1):
- retl
- addx %g0,%g0,%o0 C return carry-out from most sign. limb
- L(1): xor s1_ptr,res_ptr,%g1
- andcc %g1,4,%g0
- bne L(2)
- nop
- C ** V1b **
- andcc res_ptr,4,%g0 C res_ptr unaligned? Side effect: cy=0
- be L(v1b) C if no, branch
- nop
- C Add least significant limb separately to align res_ptr and s1_ptr
- ld [s2_ptr],%g4
- add s2_ptr,4,s2_ptr
- ld [s1_ptr],%g2
- add s1_ptr,4,s1_ptr
- add n,-1,n
- subcc %g2,%g4,%o4
- st %o4,[res_ptr]
- add res_ptr,4,res_ptr
- L(v1b): addx %g0,%g0,%o4 C save cy in register
- cmp n,2 C if n < 2 ...
- bl L(end2) C ... branch to tail code
- subcc %g0,%o4,%g0 C restore cy
- ld [s2_ptr+0],%g4
- addcc n,-10,n
- ld [s2_ptr+4],%g1
- ldd [s1_ptr+0],%g2
- blt L(fin1b)
- subcc %g0,%o4,%g0 C restore cy
- C Add blocks of 8 limbs until less than 8 limbs remain
- L(loop1b):
- subxcc %g2,%g4,%o4
- ld [s2_ptr+8],%g4
- subxcc %g3,%g1,%o5
- ld [s2_ptr+12],%g1
- ldd [s1_ptr+8],%g2
- std %o4,[res_ptr+0]
- subxcc %g2,%g4,%o4
- ld [s2_ptr+16],%g4
- subxcc %g3,%g1,%o5
- ld [s2_ptr+20],%g1
- ldd [s1_ptr+16],%g2
- std %o4,[res_ptr+8]
- subxcc %g2,%g4,%o4
- ld [s2_ptr+24],%g4
- subxcc %g3,%g1,%o5
- ld [s2_ptr+28],%g1
- ldd [s1_ptr+24],%g2
- std %o4,[res_ptr+16]
- subxcc %g2,%g4,%o4
- ld [s2_ptr+32],%g4
- subxcc %g3,%g1,%o5
- ld [s2_ptr+36],%g1
- ldd [s1_ptr+32],%g2
- std %o4,[res_ptr+24]
- addx %g0,%g0,%o4 C save cy in register
- addcc n,-8,n
- add s1_ptr,32,s1_ptr
- add s2_ptr,32,s2_ptr
- add res_ptr,32,res_ptr
- bge L(loop1b)
- subcc %g0,%o4,%g0 C restore cy
- L(fin1b):
- addcc n,8-2,n
- blt L(end1b)
- subcc %g0,%o4,%g0 C restore cy
- C Add blocks of 2 limbs until less than 2 limbs remain
- L(loope1b):
- subxcc %g2,%g4,%o4
- ld [s2_ptr+8],%g4
- subxcc %g3,%g1,%o5
- ld [s2_ptr+12],%g1
- ldd [s1_ptr+8],%g2
- std %o4,[res_ptr+0]
- addx %g0,%g0,%o4 C save cy in register
- addcc n,-2,n
- add s1_ptr,8,s1_ptr
- add s2_ptr,8,s2_ptr
- add res_ptr,8,res_ptr
- bge L(loope1b)
- subcc %g0,%o4,%g0 C restore cy
- L(end1b):
- subxcc %g2,%g4,%o4
- subxcc %g3,%g1,%o5
- std %o4,[res_ptr+0]
- addx %g0,%g0,%o4 C save cy in register
- andcc n,1,%g0
- be L(ret1b)
- subcc %g0,%o4,%g0 C restore cy
- C Add last limb
- ld [s2_ptr+8],%g4
- ld [s1_ptr+8],%g2
- subxcc %g2,%g4,%o4
- st %o4,[res_ptr+8]
- L(ret1b):
- retl
- addx %g0,%g0,%o0 C return carry-out from most sign. limb
- C ** V2 **
- C If we come here, the alignment of s1_ptr and res_ptr as well as the
- C alignment of s2_ptr and res_ptr differ. Since there are only two ways
- C things can be aligned (that we care about) we now know that the alignment
- C of s1_ptr and s2_ptr are the same.
- L(2): cmp n,1
- be L(jone)
- nop
- andcc s1_ptr,4,%g0 C s1_ptr unaligned? Side effect: cy=0
- be L(v2) C if no, branch
- nop
- C Add least significant limb separately to align s1_ptr and s2_ptr
- ld [s1_ptr],%g4
- add s1_ptr,4,s1_ptr
- ld [s2_ptr],%g2
- add s2_ptr,4,s2_ptr
- add n,-1,n
- subcc %g4,%g2,%o4
- st %o4,[res_ptr]
- add res_ptr,4,res_ptr
- L(v2): addx %g0,%g0,%o4 C save cy in register
- addcc n,-8,n
- blt L(fin2)
- subcc %g0,%o4,%g0 C restore cy
- C Add blocks of 8 limbs until less than 8 limbs remain
- L(loop2):
- ldd [s1_ptr+0],%g2
- ldd [s2_ptr+0],%o4
- subxcc %g2,%o4,%g2
- st %g2,[res_ptr+0]
- subxcc %g3,%o5,%g3
- st %g3,[res_ptr+4]
- ldd [s1_ptr+8],%g2
- ldd [s2_ptr+8],%o4
- subxcc %g2,%o4,%g2
- st %g2,[res_ptr+8]
- subxcc %g3,%o5,%g3
- st %g3,[res_ptr+12]
- ldd [s1_ptr+16],%g2
- ldd [s2_ptr+16],%o4
- subxcc %g2,%o4,%g2
- st %g2,[res_ptr+16]
- subxcc %g3,%o5,%g3
- st %g3,[res_ptr+20]
- ldd [s1_ptr+24],%g2
- ldd [s2_ptr+24],%o4
- subxcc %g2,%o4,%g2
- st %g2,[res_ptr+24]
- subxcc %g3,%o5,%g3
- st %g3,[res_ptr+28]
- addx %g0,%g0,%o4 C save cy in register
- addcc n,-8,n
- add s1_ptr,32,s1_ptr
- add s2_ptr,32,s2_ptr
- add res_ptr,32,res_ptr
- bge L(loop2)
- subcc %g0,%o4,%g0 C restore cy
- L(fin2):
- addcc n,8-2,n
- blt L(end2)
- subcc %g0,%o4,%g0 C restore cy
- L(loope2):
- ldd [s1_ptr+0],%g2
- ldd [s2_ptr+0],%o4
- subxcc %g2,%o4,%g2
- st %g2,[res_ptr+0]
- subxcc %g3,%o5,%g3
- st %g3,[res_ptr+4]
- addx %g0,%g0,%o4 C save cy in register
- addcc n,-2,n
- add s1_ptr,8,s1_ptr
- add s2_ptr,8,s2_ptr
- add res_ptr,8,res_ptr
- bge L(loope2)
- subcc %g0,%o4,%g0 C restore cy
- L(end2):
- andcc n,1,%g0
- be L(ret2)
- subcc %g0,%o4,%g0 C restore cy
- C Add last limb
- L(jone):
- ld [s1_ptr],%g4
- ld [s2_ptr],%g2
- subxcc %g4,%g2,%o4
- st %o4,[res_ptr]
- L(ret2):
- retl
- addx %g0,%g0,%o0 C return carry-out from most sign. limb
- EPILOGUE(mpn_sub_n)