277 lines
6.4 KiB
ArmAsm
277 lines
6.4 KiB
ArmAsm
; mc88110 __gmpn_sub_n -- Subtract two limb vectors of the same length > 0 and
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; store difference in a third limb vector.
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; Copyright 1995, 1996, 2000 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, write to
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; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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; MA 02110-1301, USA.
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; INPUT PARAMETERS
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#define res_ptr r2
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#define s1_ptr r3
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#define s2_ptr r4
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#define size r5
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#include "sysdep.h"
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text
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align 16
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global C_SYMBOL_NAME(__gmpn_sub_n)
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C_SYMBOL_NAME(__gmpn_sub_n):
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subu.co r0,r0,r0 ; set cy flag
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xor r12,s2_ptr,res_ptr
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bb1 2,r12,L1
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; ** V1a **
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L0: bb0 2,res_ptr,L_v1 ; branch if res_ptr is aligned
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/* Add least significant limb separately to align res_ptr and s2_ptr */
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ld r10,s1_ptr,0
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addu s1_ptr,s1_ptr,4
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ld r8,s2_ptr,0
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addu s2_ptr,s2_ptr,4
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subu size,size,1
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subu.co r6,r10,r8
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st r6,res_ptr,0
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addu res_ptr,res_ptr,4
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L_v1: cmp r12,size,2
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bb1 lt,r12,Lend2
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ld r10,s1_ptr,0
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ld r12,s1_ptr,4
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ld.d r8,s2_ptr,0
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subu size,size,10
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bcnd lt0,size,Lfin1
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/* Add blocks of 8 limbs until less than 8 limbs remain */
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align 8
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Loop1: subu size,size,8
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subu.cio r6,r10,r8
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ld r10,s1_ptr,8
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subu.cio r7,r12,r9
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ld r12,s1_ptr,12
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ld.d r8,s2_ptr,8
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st.d r6,res_ptr,0
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subu.cio r6,r10,r8
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ld r10,s1_ptr,16
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subu.cio r7,r12,r9
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ld r12,s1_ptr,20
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ld.d r8,s2_ptr,16
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st.d r6,res_ptr,8
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subu.cio r6,r10,r8
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ld r10,s1_ptr,24
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subu.cio r7,r12,r9
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ld r12,s1_ptr,28
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ld.d r8,s2_ptr,24
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st.d r6,res_ptr,16
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subu.cio r6,r10,r8
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ld r10,s1_ptr,32
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subu.cio r7,r12,r9
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ld r12,s1_ptr,36
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addu s1_ptr,s1_ptr,32
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ld.d r8,s2_ptr,32
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addu s2_ptr,s2_ptr,32
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st.d r6,res_ptr,24
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addu res_ptr,res_ptr,32
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bcnd ge0,size,Loop1
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Lfin1: addu size,size,8-2
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bcnd lt0,size,Lend1
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/* Add blocks of 2 limbs until less than 2 limbs remain */
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Loope1: subu.cio r6,r10,r8
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ld r10,s1_ptr,8
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subu.cio r7,r12,r9
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ld r12,s1_ptr,12
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ld.d r8,s2_ptr,8
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st.d r6,res_ptr,0
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subu size,size,2
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addu s1_ptr,s1_ptr,8
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addu s2_ptr,s2_ptr,8
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addu res_ptr,res_ptr,8
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bcnd ge0,size,Loope1
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Lend1: subu.cio r6,r10,r8
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subu.cio r7,r12,r9
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st.d r6,res_ptr,0
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bb0 0,size,Lret1
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/* Add last limb */
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ld r10,s1_ptr,8
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ld r8,s2_ptr,8
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subu.cio r6,r10,r8
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st r6,res_ptr,8
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Lret1: addu.ci r2,r0,r0 ; return carry-out from most sign. limb
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jmp.n r1
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xor r2,r2,1
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L1: xor r12,s1_ptr,res_ptr
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bb1 2,r12,L2
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; ** V1b **
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bb0 2,res_ptr,L_v1b ; branch if res_ptr is aligned
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/* Add least significant limb separately to align res_ptr and s1_ptr */
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ld r10,s2_ptr,0
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addu s2_ptr,s2_ptr,4
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ld r8,s1_ptr,0
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addu s1_ptr,s1_ptr,4
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subu size,size,1
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subu.co r6,r8,r10
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st r6,res_ptr,0
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addu res_ptr,res_ptr,4
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L_v1b: cmp r12,size,2
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bb1 lt,r12,Lend2
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ld r10,s2_ptr,0
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ld r12,s2_ptr,4
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ld.d r8,s1_ptr,0
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subu size,size,10
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bcnd lt0,size,Lfin1b
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/* Add blocks of 8 limbs until less than 8 limbs remain */
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align 8
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Loop1b: subu size,size,8
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subu.cio r6,r8,r10
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ld r10,s2_ptr,8
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subu.cio r7,r9,r12
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ld r12,s2_ptr,12
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ld.d r8,s1_ptr,8
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st.d r6,res_ptr,0
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subu.cio r6,r8,r10
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ld r10,s2_ptr,16
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subu.cio r7,r9,r12
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ld r12,s2_ptr,20
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ld.d r8,s1_ptr,16
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st.d r6,res_ptr,8
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subu.cio r6,r8,r10
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ld r10,s2_ptr,24
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subu.cio r7,r9,r12
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ld r12,s2_ptr,28
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ld.d r8,s1_ptr,24
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st.d r6,res_ptr,16
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subu.cio r6,r8,r10
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ld r10,s2_ptr,32
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subu.cio r7,r9,r12
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ld r12,s2_ptr,36
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addu s2_ptr,s2_ptr,32
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ld.d r8,s1_ptr,32
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addu s1_ptr,s1_ptr,32
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st.d r6,res_ptr,24
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addu res_ptr,res_ptr,32
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bcnd ge0,size,Loop1b
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Lfin1b: addu size,size,8-2
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bcnd lt0,size,Lend1b
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/* Add blocks of 2 limbs until less than 2 limbs remain */
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Loope1b:subu.cio r6,r8,r10
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ld r10,s2_ptr,8
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subu.cio r7,r9,r12
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ld r12,s2_ptr,12
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ld.d r8,s1_ptr,8
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st.d r6,res_ptr,0
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subu size,size,2
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addu s1_ptr,s1_ptr,8
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addu s2_ptr,s2_ptr,8
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addu res_ptr,res_ptr,8
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bcnd ge0,size,Loope1b
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Lend1b: subu.cio r6,r8,r10
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subu.cio r7,r9,r12
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st.d r6,res_ptr,0
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bb0 0,size,Lret1b
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/* Add last limb */
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ld r10,s2_ptr,8
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ld r8,s1_ptr,8
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subu.cio r6,r8,r10
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st r6,res_ptr,8
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Lret1b: addu.ci r2,r0,r0 ; return carry-out from most sign. limb
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jmp.n r1
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xor r2,r2,1
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; ** V2 **
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/* If we come here, the alignment of s1_ptr and res_ptr as well as the
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alignment of s2_ptr and res_ptr differ. Since there are only two ways
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things can be aligned (that we care about) we now know that the alignment
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of s1_ptr and s2_ptr are the same. */
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L2: cmp r12,size,1
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bb1 eq,r12,Ljone
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bb0 2,s1_ptr,L_v2 ; branch if s1_ptr is aligned
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/* Add least significant limb separately to align res_ptr and s2_ptr */
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ld r10,s1_ptr,0
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addu s1_ptr,s1_ptr,4
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ld r8,s2_ptr,0
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addu s2_ptr,s2_ptr,4
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subu size,size,1
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subu.co r6,r10,r8
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st r6,res_ptr,0
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addu res_ptr,res_ptr,4
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L_v2: subu size,size,8
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bcnd lt0,size,Lfin2
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/* Add blocks of 8 limbs until less than 8 limbs remain */
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align 8
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Loop2: subu size,size,8
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ld.d r8,s1_ptr,0
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ld.d r6,s2_ptr,0
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subu.cio r8,r8,r6
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st r8,res_ptr,0
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subu.cio r9,r9,r7
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st r9,res_ptr,4
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ld.d r8,s1_ptr,8
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ld.d r6,s2_ptr,8
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subu.cio r8,r8,r6
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st r8,res_ptr,8
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subu.cio r9,r9,r7
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st r9,res_ptr,12
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ld.d r8,s1_ptr,16
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ld.d r6,s2_ptr,16
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subu.cio r8,r8,r6
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st r8,res_ptr,16
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subu.cio r9,r9,r7
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st r9,res_ptr,20
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ld.d r8,s1_ptr,24
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ld.d r6,s2_ptr,24
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subu.cio r8,r8,r6
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st r8,res_ptr,24
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subu.cio r9,r9,r7
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st r9,res_ptr,28
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addu s1_ptr,s1_ptr,32
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addu s2_ptr,s2_ptr,32
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addu res_ptr,res_ptr,32
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bcnd ge0,size,Loop2
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Lfin2: addu size,size,8-2
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bcnd lt0,size,Lend2
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Loope2: ld.d r8,s1_ptr,0
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ld.d r6,s2_ptr,0
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subu.cio r8,r8,r6
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st r8,res_ptr,0
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subu.cio r9,r9,r7
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st r9,res_ptr,4
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subu size,size,2
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addu s1_ptr,s1_ptr,8
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addu s2_ptr,s2_ptr,8
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addu res_ptr,res_ptr,8
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bcnd ge0,size,Loope2
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Lend2: bb0 0,size,Lret2
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/* Add last limb */
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Ljone: ld r10,s1_ptr,0
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ld r8,s2_ptr,0
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subu.cio r6,r10,r8
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st r6,res_ptr,0
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Lret2: addu.ci r2,r0,r0 ; return carry-out from most sign. limb
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jmp.n r1
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xor r2,r2,1
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