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# *****************************************************************
#
# The Compcert verified compiler
#
# Xavier Leroy, INRIA Paris-Rocquencourt
#
# Copyright (c) 2013 Institut National de Recherche en Informatique et
# en Automatique.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the <organization> nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT
# HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# *********************************************************************
# Helper functions for 64-bit integer arithmetic. PowerPC 64 version.
.text
### Conversion from double float to unsigned long
.balign 16
.globl __compcert_i64_dtou
__compcert_i64_dtou:
lis r0, 0x5f00 # 0x5f00_0000 = 2^63 in binary32 format
stwu r0, -16(r1)
lfs f2, 0(r1) # f2 = 2^63
fcmpu cr0, f1, f2 # crbit 0 is f1 < f2
bf 0, 1f # branch if f1 >= 2^63 (or f1 is NaN)
fctidz f1, f1 # convert as signed
stfd f1, 0(r1)
lwz r3, 0(r1)
lwz r4, 4(r1)
addi r1, r1, 16
blr
1: fsub f1, f1, f2 # shift argument down by 2^63
fctidz f1, f1 # convert as signed
stfd f1, 0(r1)
lwz r3, 0(r1)
lwz r4, 4(r1)
addis r3, r3, 0x8000 # shift result up by 2^63
addi r1, r1, 16
blr
.type __compcert_i64_dtou, @function
.size __compcert_i64_dtou, .-__compcert_i64_dtou
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