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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.
#include "sysdeps.h"
// Conversion float -> unsigned long
FUNCTION(__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 8(%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
.p2align 2
LC1: .long 0x5f000000 // 2^63 in single precision
ENDFUNCTION(__i64_dtou)
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