1 files changed, 121 insertions, 0 deletions
diff --git a/ports/sysdeps/mips/sub_n.S b/ports/sysdeps/mips/sub_n.S
new file mode 100644
index 0000000000..8f418d1a0d
--- /dev/null
+++ b/ports/sysdeps/mips/sub_n.S
@@ -0,0 +1,121 @@
+/* MIPS2 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
+store difference in a third limb vector.
+
+Copyright (C) 1995, 2000, 2002, 2003 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.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+/* INPUT PARAMETERS
+   res_ptr	$4
+   s1_ptr	$5
+   s2_ptr	$6
+   size		$7
+*/
+#ifdef __PIC__
+	.option pic2
+#endif
+ENTRY (__mpn_sub_n)
+	.set	noreorder
+#ifdef __PIC__
+	.cpload t9
+#endif
+	.set	nomacro
+
+	lw	$10,0($5)
+	lw	$11,0($6)
+
+	addiu	$7,$7,-1
+	and	$9,$7,4-1	/* number of limbs in first loop */
+	beq	$9,$0,L(L0)	/* if multiple of 4 limbs, skip first loop */
+	move	$2,$0
+
+	subu	$7,$7,$9
+
+L(Loop0):	addiu	$9,$9,-1
+	lw	$12,4($5)
+	addu	$11,$11,$2
+	lw	$13,4($6)
+	sltu	$8,$11,$2
+	subu	$11,$10,$11
+	sltu	$2,$10,$11
+	sw	$11,0($4)
+	or	$2,$2,$8
+
+	addiu	$5,$5,4
+	addiu	$6,$6,4
+	move	$10,$12
+	move	$11,$13
+	bne	$9,$0,L(Loop0)
+	addiu	$4,$4,4
+
+L(L0):	beq	$7,$0,L(Lend)
+	nop
+
+L(Loop):	addiu	$7,$7,-4
+
+	lw	$12,4($5)
+	addu	$11,$11,$2
+	lw	$13,4($6)
+	sltu	$8,$11,$2
+	subu	$11,$10,$11
+	sltu	$2,$10,$11
+	sw	$11,0($4)
+	or	$2,$2,$8
+
+	lw	$10,8($5)
+	addu	$13,$13,$2
+	lw	$11,8($6)
+	sltu	$8,$13,$2
+	subu	$13,$12,$13
+	sltu	$2,$12,$13
+	sw	$13,4($4)
+	or	$2,$2,$8
+
+	lw	$12,12($5)
+	addu	$11,$11,$2
+	lw	$13,12($6)
+	sltu	$8,$11,$2
+	subu	$11,$10,$11
+	sltu	$2,$10,$11
+	sw	$11,8($4)
+	or	$2,$2,$8
+
+	lw	$10,16($5)
+	addu	$13,$13,$2
+	lw	$11,16($6)
+	sltu	$8,$13,$2
+	subu	$13,$12,$13
+	sltu	$2,$12,$13
+	sw	$13,12($4)
+	or	$2,$2,$8
+
+	addiu	$5,$5,16
+	addiu	$6,$6,16
+
+	bne	$7,$0,L(Loop)
+	addiu	$4,$4,16
+
+L(Lend):	addu	$11,$11,$2
+	sltu	$8,$11,$2
+	subu	$11,$10,$11
+	sltu	$2,$10,$11
+	sw	$11,0($4)
+	j	$31
+	or	$2,$2,$8
+	END (__mpn_sub_n)