dnl PowerPC-64 mpn_invert_limb -- Invert a normalized limb.
dnl Copyright 2015, 2017 Free Software Foundation,
Inc.
dnl
This file is part of the GNU MP Library.
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; you can redistribute it and/or modify
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Public License as published by the Free
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; either version 3 of the License, or (at your
dnl
option) any later
version.
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dnl
or
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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.
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dnl
or both in parallel, as here.
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include(`../config.m4
')
C cycles/limb (approximate)
C POWER3/PPC630 -
C POWER4/PPC970 -
C POWER5 -
C POWER6 -
C POWER7 ?
C POWER8 32
C
This runs on POWER7
and later, but is faster only on later CPUs.
C We might want to inline
this, considering its small footprint.
ASM_START()
PROLOGUE(mpn_invert_limb)
sldi. r4, r3, 1
neg r5, r3
divdeu( r3, r5, r3)
beq- L(1)
blr
L(1): li r3, -1
blr
EPILOGUE()
