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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. IA32 version.
.text
# Conversion float -> unsigned long
.globl __i64_dtou
.balign 16
__i64_dtou:
subl $4, %esp
# Change rounding mode to "round towards zero"
fnstcw 0(%esp)
movw 0(%esp), %ax
movb $12, %ah
movw %ax, 2(%esp)
fldcw 2(%esp)
# Compare argument with 2^63
fldl (4+4)(%esp)
flds LC1
fucomp
fnstsw %ax
sahf
jbe 1f # branch if not (ARG < 2^63)
# Argument < 2^63: convert as is
fistpll 8(%esp)
movl 8(%esp), %eax
movl 12(%esp), %edx
jmp 2f
# Argument > 2^63: offset ARG by -2^63, then convert, then offset RES by 2^63
1: fsubs LC1
fistpll 8(%esp)
movl 8(%esp), %eax
movl 12(%esp), %edx
addl $0x80000000, %edx
# Restore rounding mode
2: fldcw 0(%esp)
addl $4, %esp
ret
.type __i64_dtou, @function
.size __i64_dtou, . - __i64_dtou
.balign 4
LC1: .long 0x5f000000 # 2^63 in single precision
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