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-rw-r--r--ports/sysdeps/m88k/m88110/sub_n.S276
1 files changed, 276 insertions, 0 deletions
diff --git a/ports/sysdeps/m88k/m88110/sub_n.S b/ports/sysdeps/m88k/m88110/sub_n.S
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+++ b/ports/sysdeps/m88k/m88110/sub_n.S
@@ -0,0 +1,276 @@
+; mc88110 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
+; store difference in a third limb vector.
+
+; Copyright (C) 1995, 1996 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.
+
+
+; INPUT PARAMETERS
+#define res_ptr r2
+#define s1_ptr r3
+#define s2_ptr r4
+#define size r5
+
+#include "sysdep.h"
+
+ text
+ align 16
+ global C_SYMBOL_NAME(__mpn_sub_n)
+C_SYMBOL_NAME(__mpn_sub_n):
+ subu.co r0,r0,r0 ; set cy flag
+ xor r12,s2_ptr,res_ptr
+ bb1 2,r12,L1
+; ** V1a **
+L0: bb0 2,res_ptr,L_v1 ; branch if res_ptr is aligned
+/* Add least significant limb separately to align res_ptr and s2_ptr */
+ ld r10,s1_ptr,0
+ addu s1_ptr,s1_ptr,4
+ ld r8,s2_ptr,0
+ addu s2_ptr,s2_ptr,4
+ subu size,size,1
+ subu.co r6,r10,r8
+ st r6,res_ptr,0
+ addu res_ptr,res_ptr,4
+L_v1: cmp r12,size,2
+ bb1 lt,r12,Lend2
+
+ ld r10,s1_ptr,0
+ ld r12,s1_ptr,4
+ ld.d r8,s2_ptr,0
+ subu size,size,10
+ bcnd lt0,size,Lfin1
+/* Add blocks of 8 limbs until less than 8 limbs remain */
+ align 8
+Loop1: subu size,size,8
+ subu.cio r6,r10,r8
+ ld r10,s1_ptr,8
+ subu.cio r7,r12,r9
+ ld r12,s1_ptr,12
+ ld.d r8,s2_ptr,8
+ st.d r6,res_ptr,0
+ subu.cio r6,r10,r8
+ ld r10,s1_ptr,16
+ subu.cio r7,r12,r9
+ ld r12,s1_ptr,20
+ ld.d r8,s2_ptr,16
+ st.d r6,res_ptr,8
+ subu.cio r6,r10,r8
+ ld r10,s1_ptr,24
+ subu.cio r7,r12,r9
+ ld r12,s1_ptr,28
+ ld.d r8,s2_ptr,24
+ st.d r6,res_ptr,16
+ subu.cio r6,r10,r8
+ ld r10,s1_ptr,32
+ subu.cio r7,r12,r9
+ ld r12,s1_ptr,36
+ addu s1_ptr,s1_ptr,32
+ ld.d r8,s2_ptr,32
+ addu s2_ptr,s2_ptr,32
+ st.d r6,res_ptr,24
+ addu res_ptr,res_ptr,32
+ bcnd ge0,size,Loop1
+
+Lfin1: addu size,size,8-2
+ bcnd lt0,size,Lend1
+/* Add blocks of 2 limbs until less than 2 limbs remain */
+Loope1: subu.cio r6,r10,r8
+ ld r10,s1_ptr,8
+ subu.cio r7,r12,r9
+ ld r12,s1_ptr,12
+ ld.d r8,s2_ptr,8
+ st.d r6,res_ptr,0
+ subu size,size,2
+ addu s1_ptr,s1_ptr,8
+ addu s2_ptr,s2_ptr,8
+ addu res_ptr,res_ptr,8
+ bcnd ge0,size,Loope1
+Lend1: subu.cio r6,r10,r8
+ subu.cio r7,r12,r9
+ st.d r6,res_ptr,0
+
+ bb0 0,size,Lret1
+/* Add last limb */
+ ld r10,s1_ptr,8
+ ld r8,s2_ptr,8
+ subu.cio r6,r10,r8
+ st r6,res_ptr,8
+
+Lret1: addu.ci r2,r0,r0 ; return carry-out from most sign. limb
+ jmp.n r1
+ xor r2,r2,1
+
+L1: xor r12,s1_ptr,res_ptr
+ bb1 2,r12,L2
+; ** V1b **
+ bb0 2,res_ptr,L_v1b ; branch if res_ptr is aligned
+/* Add least significant limb separately to align res_ptr and s1_ptr */
+ ld r10,s2_ptr,0
+ addu s2_ptr,s2_ptr,4
+ ld r8,s1_ptr,0
+ addu s1_ptr,s1_ptr,4
+ subu size,size,1
+ subu.co r6,r8,r10
+ st r6,res_ptr,0
+ addu res_ptr,res_ptr,4
+L_v1b: cmp r12,size,2
+ bb1 lt,r12,Lend2
+
+ ld r10,s2_ptr,0
+ ld r12,s2_ptr,4
+ ld.d r8,s1_ptr,0
+ subu size,size,10
+ bcnd lt0,size,Lfin1b
+/* Add blocks of 8 limbs until less than 8 limbs remain */
+ align 8
+Loop1b: subu size,size,8
+ subu.cio r6,r8,r10
+ ld r10,s2_ptr,8
+ subu.cio r7,r9,r12
+ ld r12,s2_ptr,12
+ ld.d r8,s1_ptr,8
+ st.d r6,res_ptr,0
+ subu.cio r6,r8,r10
+ ld r10,s2_ptr,16
+ subu.cio r7,r9,r12
+ ld r12,s2_ptr,20
+ ld.d r8,s1_ptr,16
+ st.d r6,res_ptr,8
+ subu.cio r6,r8,r10
+ ld r10,s2_ptr,24
+ subu.cio r7,r9,r12
+ ld r12,s2_ptr,28
+ ld.d r8,s1_ptr,24
+ st.d r6,res_ptr,16
+ subu.cio r6,r8,r10
+ ld r10,s2_ptr,32
+ subu.cio r7,r9,r12
+ ld r12,s2_ptr,36
+ addu s2_ptr,s2_ptr,32
+ ld.d r8,s1_ptr,32
+ addu s1_ptr,s1_ptr,32
+ st.d r6,res_ptr,24
+ addu res_ptr,res_ptr,32
+ bcnd ge0,size,Loop1b
+
+Lfin1b: addu size,size,8-2
+ bcnd lt0,size,Lend1b
+/* Add blocks of 2 limbs until less than 2 limbs remain */
+Loope1b:subu.cio r6,r8,r10
+ ld r10,s2_ptr,8
+ subu.cio r7,r9,r12
+ ld r12,s2_ptr,12
+ ld.d r8,s1_ptr,8
+ st.d r6,res_ptr,0
+ subu size,size,2
+ addu s1_ptr,s1_ptr,8
+ addu s2_ptr,s2_ptr,8
+ addu res_ptr,res_ptr,8
+ bcnd ge0,size,Loope1b
+Lend1b: subu.cio r6,r8,r10
+ subu.cio r7,r9,r12
+ st.d r6,res_ptr,0
+
+ bb0 0,size,Lret1b
+/* Add last limb */
+ ld r10,s2_ptr,8
+ ld r8,s1_ptr,8
+ subu.cio r6,r8,r10
+ st r6,res_ptr,8
+
+Lret1b: addu.ci r2,r0,r0 ; return carry-out from most sign. limb
+ jmp.n r1
+ xor r2,r2,1
+
+; ** V2 **
+/* If we come here, the alignment of s1_ptr and res_ptr as well as the
+ alignment of s2_ptr and res_ptr differ. Since there are only two ways
+ things can be aligned (that we care about) we now know that the alignment
+ of s1_ptr and s2_ptr are the same. */
+
+L2: cmp r12,size,1
+ bb1 eq,r12,Ljone
+ bb0 2,s1_ptr,L_v2 ; branch if s1_ptr is aligned
+/* Add least significant limb separately to align res_ptr and s2_ptr */
+ ld r10,s1_ptr,0
+ addu s1_ptr,s1_ptr,4
+ ld r8,s2_ptr,0
+ addu s2_ptr,s2_ptr,4
+ subu size,size,1
+ subu.co r6,r10,r8
+ st r6,res_ptr,0
+ addu res_ptr,res_ptr,4
+
+L_v2: subu size,size,8
+ bcnd lt0,size,Lfin2
+/* Add blocks of 8 limbs until less than 8 limbs remain */
+ align 8
+Loop2: subu size,size,8
+ ld.d r8,s1_ptr,0
+ ld.d r6,s2_ptr,0
+ subu.cio r8,r8,r6
+ st r8,res_ptr,0
+ subu.cio r9,r9,r7
+ st r9,res_ptr,4
+ ld.d r8,s1_ptr,8
+ ld.d r6,s2_ptr,8
+ subu.cio r8,r8,r6
+ st r8,res_ptr,8
+ subu.cio r9,r9,r7
+ st r9,res_ptr,12
+ ld.d r8,s1_ptr,16
+ ld.d r6,s2_ptr,16
+ subu.cio r8,r8,r6
+ st r8,res_ptr,16
+ subu.cio r9,r9,r7
+ st r9,res_ptr,20
+ ld.d r8,s1_ptr,24
+ ld.d r6,s2_ptr,24
+ subu.cio r8,r8,r6
+ st r8,res_ptr,24
+ subu.cio r9,r9,r7
+ st r9,res_ptr,28
+ addu s1_ptr,s1_ptr,32
+ addu s2_ptr,s2_ptr,32
+ addu res_ptr,res_ptr,32
+ bcnd ge0,size,Loop2
+
+Lfin2: addu size,size,8-2
+ bcnd lt0,size,Lend2
+Loope2: ld.d r8,s1_ptr,0
+ ld.d r6,s2_ptr,0
+ subu.cio r8,r8,r6
+ st r8,res_ptr,0
+ subu.cio r9,r9,r7
+ st r9,res_ptr,4
+ subu size,size,2
+ addu s1_ptr,s1_ptr,8
+ addu s2_ptr,s2_ptr,8
+ addu res_ptr,res_ptr,8
+ bcnd ge0,size,Loope2
+Lend2: bb0 0,size,Lret2
+/* Add last limb */
+Ljone: ld r10,s1_ptr,0
+ ld r8,s2_ptr,0
+ subu.cio r6,r10,r8
+ st r6,res_ptr,0
+
+Lret2: addu.ci r2,r0,r0 ; return carry-out from most sign. limb
+ jmp.n r1
+ xor r2,r2,1
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