summaryrefslogtreecommitdiff
path: root/sysdeps/mips/lshift.S
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/mips/lshift.S')
-rw-r--r--sysdeps/mips/lshift.S97
1 files changed, 97 insertions, 0 deletions
diff --git a/sysdeps/mips/lshift.S b/sysdeps/mips/lshift.S
new file mode 100644
index 0000000000..e76630310f
--- /dev/null
+++ b/sysdeps/mips/lshift.S
@@ -0,0 +1,97 @@
+/* MIPS2 __mpn_lshift --
+
+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
+ src_ptr $5
+ size $6
+ cnt $7
+*/
+#ifdef PIC
+ .option pic2
+#endif
+ENTRY (__mpn_lshift)
+ .set noreorder
+#ifdef PIC
+ .cpload t9
+#endif
+ .set nomacro
+
+ sll $2,$6,2
+ addu $5,$5,$2 /* make r5 point at end of src */
+ lw $10,-4($5) /* load first limb */
+ subu $13,$0,$7
+ addu $4,$4,$2 /* make r4 point at end of res */
+ addiu $6,$6,-1
+ and $9,$6,4-1 /* number of limbs in first loop */
+ beq $9,$0,.L0 /* if multiple of 4 limbs, skip first loop */
+ srl $2,$10,$13 /* compute function result */
+
+ subu $6,$6,$9
+
+.Loop0: lw $3,-8($5)
+ addiu $4,$4,-4
+ addiu $5,$5,-4
+ addiu $9,$9,-1
+ sll $11,$10,$7
+ srl $12,$3,$13
+ move $10,$3
+ or $8,$11,$12
+ bne $9,$0,.Loop0
+ sw $8,0($4)
+
+.L0: beq $6,$0,.Lend
+ nop
+
+.Loop: lw $3,-8($5)
+ addiu $4,$4,-16
+ addiu $6,$6,-4
+ sll $11,$10,$7
+ srl $12,$3,$13
+
+ lw $10,-12($5)
+ sll $14,$3,$7
+ or $8,$11,$12
+ sw $8,12($4)
+ srl $9,$10,$13
+
+ lw $3,-16($5)
+ sll $11,$10,$7
+ or $8,$14,$9
+ sw $8,8($4)
+ srl $12,$3,$13
+
+ lw $10,-20($5)
+ sll $14,$3,$7
+ or $8,$11,$12
+ sw $8,4($4)
+ srl $9,$10,$13
+
+ addiu $5,$5,-16
+ or $8,$14,$9
+ bgtz $6,.Loop
+ sw $8,0($4)
+
+.Lend: sll $8,$10,$7
+ j $31
+ sw $8,-4($4)