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+dnl IBM POWER mpn_mul_1 -- Multiply a limb vector with a limb and store the
+dnl result in a second limb vector.
+
+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 s1_ptr r4
+dnl size r5
+dnl s2_limb r6
+
+dnl The POWER architecture has no unsigned 32x32->64 bit multiplication
+dnl instruction. To obtain that operation, we have to use the 32x32->64
+dnl signed multiplication instruction, and add the appropriate compensation to
+dnl the high limb of the result. We add the multiplicand if the multiplier
+dnl has its most significant bit set, and we add the multiplier if the
+dnl multiplicand has its most significant bit set. We need to preserve the
+dnl carry flag between each iteration, so we have to compute the compensation
+dnl carefully (the natural, srai+and doesn't work). Since all POWER can
+dnl branch in zero cycles, we use conditional branches for the compensation.
+
+include(`../config.m4')
+
+ASM_START()
+PROLOGUE(mpn_mul_1)
+ cal 3,-4(3)
+ l 0,0(4)
+ cmpi 0,6,0
+ mtctr 5
+ mul 9,0,6
+ srai 7,0,31
+ and 7,7,6
+ mfmq 8
+ ai 0,0,0 C reset carry
+ cax 9,9,7
+ blt Lneg
+Lpos: bdz Lend
+Lploop: lu 0,4(4)
+ stu 8,4(3)
+ cmpi 0,0,0
+ mul 10,0,6
+ mfmq 0
+ ae 8,0,9
+ bge Lp0
+ cax 10,10,6 C adjust high limb for negative limb from s1
+Lp0: bdz Lend0
+ lu 0,4(4)
+ stu 8,4(3)
+ cmpi 0,0,0
+ mul 9,0,6
+ mfmq 0
+ ae 8,0,10
+ bge Lp1
+ cax 9,9,6 C adjust high limb for negative limb from s1
+Lp1: bdn Lploop
+ b Lend
+
+Lneg: cax 9,9,0
+ bdz Lend
+Lnloop: lu 0,4(4)
+ stu 8,4(3)
+ cmpi 0,0,0
+ mul 10,0,6
+ cax 10,10,0 C adjust high limb for negative s2_limb
+ mfmq 0
+ ae 8,0,9
+ bge Ln0
+ cax 10,10,6 C adjust high limb for negative limb from s1
+Ln0: bdz Lend0
+ lu 0,4(4)
+ stu 8,4(3)
+ cmpi 0,0,0
+ mul 9,0,6
+ cax 9,9,0 C adjust high limb for negative s2_limb
+ mfmq 0
+ ae 8,0,10
+ bge Ln1
+ cax 9,9,6 C adjust high limb for negative limb from s1
+Ln1: bdn Lnloop
+ b Lend
+
+Lend0: cal 9,0(10)
+Lend: st 8,4(3)
+ aze 3,9
+ br
+EPILOGUE(mpn_mul_1)