Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpn / i960 / sub_n.s

diff --git a/gmp/mpn/i960/sub_n.s b/gmp/mpn/i960/sub_n.s
new file mode 100644 (file)
index 0000000..87adcbf
--- /dev/null
+++ b/gmp/mpn/i960/sub_n.s
@@ -0,0 +1,41 @@
+# I960 __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 4
+       .globl ___gmpn_sub_n
+___gmpn_sub_n:
+       mov     1,g6            # set carry-save register
+       cmpo    1,0             # clear cy
+
+Loop:  subo    1,g3,g3         # update loop counter
+       ld      (g1),g5         # load from s1_ptr
+       addo    4,g1,g1         # s1_ptr++
+       ld      (g2),g4         # load from s2_ptr
+       addo    4,g2,g2         # s2_ptr++
+       cmpo    g6,1            # restore cy from g6, relies on cy being 0
+       subc    g4,g5,g4        # main subtract
+       subc    0,0,g6          # save cy in g6
+       st      g4,(g0)         # store result to res_ptr
+       addo    4,g0,g0         # res_ptr++
+       cmpobne 0,g3,Loop       # when branch is taken, cy will be 0
+
+       mov     g6,g0
+       ret