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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 version.
### Conversion from signed long to double float
.balign 16
.globl __i64_stod
__i64_stod:
addi r1, r1, -16
lis r5, 0x4330
li r6, 0
stw r5, 0(r1)
stw r4, 4(r1) # 0(r1) = 2^52 + (double) XL
stw r5, 8(r1)
stw r6, 12(r1) # 8(r1) = 2^52
lfd f1, 0(r1)
lfd f2, 8(r1)
fsub f1, f1, f2 # f1 is XL (unsigned) as a double
lis r5, 0x4530
lis r6, 0x8000
stw r5, 0(r1) # 0(r1) = 2^84 + ((double)XH - 2^31) * 2^32
add r3, r3, r6
stw r3, 4(r1)
stw r5, 8(r1) # 8(r1) = 2^84 + 2^31 * 2^32
stw r6, 12(r1)
lfd f2, 0(r1)
lfd f3, 8(r1)
fsub f2, f2, f3 # f2 is XH (signed) * 2^32 as a double
fadd f1, f1, f2 # add both to get result
addi r1, r1, 16
blr
.type __i64_stod, @function
.size __i64_stod, .-__i64_stod
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