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+dnl IBM POWER mpn_rshift -- Shift a number right.
+
+dnl Copyright 1992, 1994, 1999-2001 Free Software Foundation, Inc.
+
+dnl This file is part of the GNU MP Library.
+dnl
+dnl The GNU MP Library is free software; you can redistribute it and/or modify
+dnl it under the terms of either:
+dnl
+dnl * the GNU Lesser General Public License as published by the Free
+dnl Software Foundation; either version 3 of the License, or (at your
+dnl option) any later version.
+dnl
+dnl or
+dnl
+dnl * the GNU General Public License as published by the Free Software
+dnl Foundation; either version 2 of the License, or (at your option) any
+dnl later version.
+dnl
+dnl or both in parallel, as here.
+dnl
+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 General Public License
+dnl for more details.
+dnl
+dnl You should have received copies of the GNU General Public License and the
+dnl GNU Lesser General Public License along with the GNU MP Library. If not,
+dnl see https://www.gnu.org/licenses/.
+
+
+dnl INPUT PARAMETERS
+dnl res_ptr r3
+dnl s_ptr r4
+dnl size r5
+dnl cnt r6
+
+include(`../config.m4')
+
+ASM_START()
+PROLOGUE(mpn_rshift)
+ sfi 8,6,32
+ mtctr 5 C put limb count in CTR loop register
+ l 0,0(4) C read least significant limb
+ ai 9,3,-4 C adjust res_ptr since it's offset in the stu:s
+ sle 3,0,8 C compute carry limb, and init MQ register
+ bdz Lend2 C if just one limb, skip loop
+ lu 0,4(4) C read 2:nd least significant limb
+ sleq 7,0,8 C compute least significant limb of result
+ bdz Lend C if just two limb, skip loop
+Loop: lu 0,4(4) C load next higher limb
+ stu 7,4(9) C store previous result during read latency
+ sleq 7,0,8 C compute result limb
+ bdn Loop C loop back until CTR is zero
+Lend: stu 7,4(9) C store 2:nd most significant limb
+Lend2: sre 7,0,6 C compute most significant limb
+ st 7,4(9) C store it
+ br
+EPILOGUE(mpn_rshift)