1 files changed, 98 insertions, 0 deletions
diff --git a/sysdeps/mips/submul_1.S b/sysdeps/mips/submul_1.S
new file mode 100644
index 0000000000..eae8ebbfaf
--- /dev/null
+++ b/sysdeps/mips/submul_1.S
@@ -0,0 +1,98 @@
+/* MIPS __mpn_submul_1 -- Multiply a limb vector with a single limb and
+subtract the product from a second limb vector.
+
+Copyright (C) 1995 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 Library General Public License as published by
+the Free Software Foundation; either version 2 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library 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.  */
+
+#include <sysdep.h>
+
+/* INPUT PARAMETERS
+   res_ptr	$4
+   s1_ptr	$5
+   size		$6
+   s2_limb	$7
+*/
+#ifdef PIC
+	.option pic2
+#endif
+ENTRY (__mpn_submul_1)
+	.set    noreorder
+#ifdef PIC
+	.cpload t9
+#endif
+	.set    nomacro
+
+	/* warm up phase 0 */
+	lw	$8,0($5)
+
+	/* warm up phase 1 */
+	addiu	$5,$5,4
+	multu	$8,$7
+
+	addiu	$6,$6,-1
+	beq	$6,$0,$LC0
+	move	$2,$0		/* zero cy2 */
+
+	addiu	$6,$6,-1
+	beq	$6,$0,$LC1
+	lw	$8,0($5)	/* load new s1 limb as early as possible */
+
+Loop:	lw	$10,0($4)
+	mflo	$3
+	mfhi	$9
+	addiu	$5,$5,4
+	addu	$3,$3,$2	/* add old carry limb to low product limb */
+	multu	$8,$7
+	lw	$8,0($5)	/* load new s1 limb as early as possible */
+	addiu	$6,$6,-1	/* decrement loop counter */
+	sltu	$2,$3,$2	/* carry from previous addition -> $2 */
+	subu	$3,$10,$3
+	sgtu	$10,$3,$10
+	addu	$2,$2,$10
+	sw	$3,0($4)
+	addiu	$4,$4,4
+	bne	$6,$0,Loop	/* should be "bnel" */
+	addu	$2,$9,$2	/* add high product limb and carry from addition */
+
+	/* cool down phase 1 */
+$LC1:	lw	$10,0($4)
+	mflo	$3
+	mfhi	$9
+	addu	$3,$3,$2
+	sltu	$2,$3,$2
+	multu	$8,$7
+	subu	$3,$10,$3
+	sgtu	$10,$3,$10
+	addu	$2,$2,$10
+	sw	$3,0($4)
+	addiu	$4,$4,4
+	addu	$2,$9,$2	/* add high product limb and carry from addition */
+
+	/* cool down phase 0 */
+$LC0:	lw	$10,0($4)
+	mflo	$3
+	mfhi	$9
+	addu	$3,$3,$2
+	sltu	$2,$3,$2
+	subu	$3,$10,$3
+	sgtu	$10,$3,$10
+	addu	$2,$2,$10
+	sw	$3,0($4)
+	j	$31
+	addu	$2,$9,$2	/* add high product limb and carry from addition */