@ *****************************************************************
@
@               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
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@ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT
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@
@ *********************************************************************

@ Helper functions for 64-bit integer arithmetic.  ARM version.

        .text

@@@ Signed comparison	
	
	.global __i64_scmp
__i64_scmp:
        cmp r0, r2              @ compare low words (unsigned)
        moveq r0, #0            @ res = 0 if eq
        movhi r0, #1            @ res = 1 if unsigned higher
        mvnlo r0, #0            @ res = -1 if unsigned lower
        cmp r1, r3              @ compare high words (signed)
	addgt r0, r0, #2        @ res += 2 if signed greater
	sublt r0, r0, #2        @ res -= 2 if signed less
   @ here, r0 = 0 if X == Y
   @       r0 = -3, -2, -1 if X < Y
   @       r0 = 1, 2, 3 if X > Y
        bx      lr
	.type __i64_scmp, %function
	.size __i64_scmp, . - __i64_scmp