Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpn / clipper / sub_n.s

diff --git a/gmp/mpn/clipper/sub_n.s b/gmp/mpn/clipper/sub_n.s
new file mode 100644 (file)
index 0000000..58c2cb3
--- /dev/null
+++ b/gmp/mpn/clipper/sub_n.s
@@ -0,0 +1,46 @@
+; Clipper __gmpn_sub_n -- Subtract two limb vectors of the same length > 0 and
+; store difference in a third limb vector.
+
+; Copyright 1995, 2000 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 3 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/.
+
+.text
+       .align 16
+.globl ___gmpn_sub_n
+___gmpn_sub_n:
+       subq    $8,sp
+       storw   r6,(sp)
+       loadw   12(sp),r2
+       loadw   16(sp),r3
+       loadq   $0,r6           ; clear carry-save register
+
+.Loop: loadw   (r1),r4
+       loadw   (r2),r5
+       addwc   r6,r6           ; restore carry from r6
+       subwc   r5,r4
+       storw   r4,(r0)
+       subwc   r6,r6           ; save carry in r6
+       addq    $4,r0
+       addq    $4,r1
+       addq    $4,r2
+       subq    $1,r3
+       brne    .Loop
+
+       negw    r6,r0
+       loadw   (sp),r6
+       addq    $8,sp
+       ret     sp