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diff --git a/rts/gmp/mpn/powerpc64/copyd.asm b/rts/gmp/mpn/powerpc64/copyd.asm
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+# PowerPC-64 mpn_copyd -- Copy a limb vector.
+
+# Copyright (C) 1999, 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 2.1 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; see the file COPYING.LIB. If not, write to
+# the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+# MA 02111-1307, USA.
+
+
+# INPUT PARAMETERS
+# rptr r3
+# sptr r4
+# n r5
+
+include(`../config.m4')
+
+# Unrolling this analogous to sparc64/copyi.s doesn't help for any
+# operand sizes.
+
+ASM_START()
+PROLOGUE(mpn_copyd)
+ cmpdi cr0,r5,0
+ mtctr r5
+ sldi r5,r5,3
+ add r4,r4,r5
+ add r3,r3,r5
+ beq cr0,.Lend
+.Loop: ldu r0,-8(r4)
+ stdu r0,-8(r3)
+ bdnz .Loop
+.Lend: blr
+EPILOGUE(mpn_copyd)