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authorWerner Koch <wk@gnupg.org>1998-06-25 10:19:06 +0000
committerWerner Koch <wk@gnupg.org>1998-06-25 10:19:06 +0000
commitf56f6f558368b380aac0b45a35b8bec409edb684 (patch)
treed7d2c8c861ab4d864e9323d4784890406c540f3a /mpi/mips3/mpih-sub1.S
parenta436a4553609f4c231f2c4200ad011e109a1a568 (diff)
downloadlibgcrypt-f56f6f558368b380aac0b45a35b8bec409edb684.tar.gz
nearly ready for 0.3.0
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+/* mips3 sub_n -- Subtract two limb vectors of the same length > 0 and
+ * store difference in a third limb vector.
+ * Copyright (C) 1995, 1998 Free Software Foundation, Inc.
+ *
+ * This file is part of GNUPG.
+ *
+ * GNUPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GNUPG 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+
+/*******************
+ * mpi_limb_t
+ * mpihelp_sub_n( mpi_ptr_t res_ptr, (r4)
+ * mpi_ptr_t s1_ptr, (r5)
+ * mpi_ptr_t s2_ptr, (r6)
+ * mpi_size_t size) (r7)
+ */
+
+
+ .text
+ .align 2
+ .globl mpihelp_sub_n
+ .ent mpihelp_sub_n
+mpihelp_sub_n:
+ .set noreorder
+ .set nomacro
+
+ ld $10,0($5)
+ ld $11,0($6)
+
+ daddiu $7,$7,-1
+ and $9,$7,4-1 # number of limbs in first loop
+ beq $9,$0,.L0 # if multiple of 4 limbs, skip first loop
+ move $2,$0
+
+ dsubu $7,$7,$9
+
+.Loop0: daddiu $9,$9,-1
+ ld $12,8($5)
+ daddu $11,$11,$2
+ ld $13,8($6)
+ sltu $8,$11,$2
+ dsubu $11,$10,$11
+ sltu $2,$10,$11
+ sd $11,0($4)
+ or $2,$2,$8
+
+ daddiu $5,$5,8
+ daddiu $6,$6,8
+ move $10,$12
+ move $11,$13
+ bne $9,$0,.Loop0
+ daddiu $4,$4,8
+
+.L0: beq $7,$0,.Lend
+ nop
+
+.Loop: daddiu $7,$7,-4
+
+ ld $12,8($5)
+ daddu $11,$11,$2
+ ld $13,8($6)
+ sltu $8,$11,$2
+ dsubu $11,$10,$11
+ sltu $2,$10,$11
+ sd $11,0($4)
+ or $2,$2,$8
+
+ ld $10,16($5)
+ daddu $13,$13,$2
+ ld $11,16($6)
+ sltu $8,$13,$2
+ dsubu $13,$12,$13
+ sltu $2,$12,$13
+ sd $13,8($4)
+ or $2,$2,$8
+
+ ld $12,24($5)
+ daddu $11,$11,$2
+ ld $13,24($6)
+ sltu $8,$11,$2
+ dsubu $11,$10,$11
+ sltu $2,$10,$11
+ sd $11,16($4)
+ or $2,$2,$8
+
+ ld $10,32($5)
+ daddu $13,$13,$2
+ ld $11,32($6)
+ sltu $8,$13,$2
+ dsubu $13,$12,$13
+ sltu $2,$12,$13
+ sd $13,24($4)
+ or $2,$2,$8
+
+ daddiu $5,$5,32
+ daddiu $6,$6,32
+
+ bne $7,$0,.Loop
+ daddiu $4,$4,32
+
+.Lend: daddu $11,$11,$2
+ sltu $8,$11,$2
+ dsubu $11,$10,$11
+ sltu $2,$10,$11
+ sd $11,0($4)
+ j $31
+ or $2,$2,$8
+
+ .end mpihelp_sub_n
+ n