Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpn / z8000x / sub_n.s

diff --git a/gmp/mpn/z8000x/sub_n.s b/gmp/mpn/z8000x/sub_n.s
new file mode 100644 (file)
index 0000000..837ecef
--- /dev/null
+++ b/gmp/mpn/z8000x/sub_n.s
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+! Z8000 (32 bit limb version) __gmpn_sub_n -- Subtract two limb vectors of the
+! same length > 0 and store difference in a third limb vector.
+
+! Copyright 1993, 1994, 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/.
+
+
+! INPUT PARAMETERS
+! res_ptr      r7
+! s1_ptr       r6
+! s2_ptr       r5
+! size         r4
+
+! If we are really crazy, we can use push to write a few result words
+! backwards, using push just because it is faster than reg+disp.  We'd
+! then add 2x the number of words written to r7...
+
+       segm
+       .text
+       even
+       global ___gmpn_sub_n
+___gmpn_sub_n:
+       popl    rr0,@r6
+       popl    rr8,@r5
+       subl    rr0,rr8
+       ldl     @r7,rr0
+       dec     r4
+       jr      eq,Lend
+Loop:  popl    rr0,@r6
+       popl    rr8,@r5
+       sbc     r1,r9
+       sbc     r0,r8
+       inc     r7,#4
+       ldl     @r7,rr0
+       dec     r4
+       jr      ne,Loop
+Lend:  ld      r2,r4           ! use 0 already in r4
+       ld      r3,r4
+       adc     r2,r2
+       ret     t