Reorganisation of the source tree

[ghc-hetmet.git] / rts / gmp / mpn / powerpc32 / sub_n.asm

diff --git a/rts/gmp/mpn/powerpc32/sub_n.asm b/rts/gmp/mpn/powerpc32/sub_n.asm
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+dnl PowerPC-32 mpn_sub_n -- Subtract two limb vectors of the same length > 0
+dnl and store difference in a third limb vector.
+
+dnl Copyright (C) 1995, 1997, 2000 Free Software Foundation, Inc.
+
+dnl This file is part of the GNU MP Library.
+
+dnl The GNU MP Library is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU Lesser General Public License as published by
+dnl the Free Software Foundation; either version 2.1 of the License, or (at your
+dnl option) any later version.
+
+dnl The GNU MP Library is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+dnl or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+dnl License for more details.
+
+dnl You should have received a copy of the GNU Lesser General Public License
+dnl along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+dnl MA 02111-1307, USA.
+
+
+dnl INPUT PARAMETERS
+dnl res_ptr    r3
+dnl s1_ptr     r4
+dnl s2_ptr     r5
+dnl size       r6
+
+include(`../config.m4')
+
+ASM_START()
+PROLOGUE(mpn_sub_n)
+       mtctr   r6              C copy size into CTR
+       addic   r0,r6,-1        C set cy
+       lwz     r8,0(r4)        C load least significant s1 limb
+       lwz     r0,0(r5)        C load least significant s2 limb
+       addi    r3,r3,-4        C offset res_ptr, it's updated before it's used
+       bdz     .Lend           C If done, skip loop
+.Loop: lwz     r9,4(r4)        C load s1 limb
+       lwz     r10,4(r5)       C load s2 limb
+       subfe   r7,r0,r8        C subtract limbs with cy, set cy
+       stw     r7,4(r3)        C store result limb
+       bdz     .Lexit          C decrement CTR and exit if done
+       lwzu    r8,8(r4)        C load s1 limb and update s1_ptr
+       lwzu    r0,8(r5)        C load s2 limb and update s2_ptr
+       subfe   r7,r10,r9       C subtract limbs with cy, set cy
+       stwu    r7,8(r3)        C store result limb and update res_ptr
+       bdnz    .Loop           C decrement CTR and loop back
+
+.Lend: subfe   r7,r0,r8
+       stw     r7,4(r3)        C store ultimate result limb
+       subfe   r3,r0,r0        C load !cy into ...
+       subfic  r3,r3,0         C ... return value register
+       blr
+.Lexit:        subfe   r7,r10,r9
+       stw     r7,8(r3)
+       subfe   r3,r0,r0        C load !cy into ...
+       subfic  r3,r3,0         C ... return value register
+       blr
+EPILOGUE(mpn_sub_n)