# *****************************************************************
#
#               The Compcert verified compiler
#
#           Xavier Leroy, INRIA Paris-Rocquencourt
#
# Copyright (c) 2013 Institut National de Recherche en Informatique et
#  en Automatique.
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# 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