# *****************************************************************
#
#               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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#       names of its contributors may be used to endorse or promote products
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# 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