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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. ARM version.
#include "sysdeps.h"
@@@ Signed modulus
FUNCTION(__i64_smod)
push {r4, r5, r6, r7, r8, r10, lr}
ASR r4, r1, #31 @ r4 = sign of N
ASR r5, r3, #31 @ r5 = sign of D
MOV r10, r4 @ r10 = sign of result
EOR r0, r0, r4 @ take absolute value of N
EOR r1, r1, r4 @ N = (N ^ (N >>s 31)) - (N >>s 31)
subs r0, r0, r4
sbc r1, r1, r4
EOR r2, r2, r5 @ take absolute value of D
EOR r3, r3, r5
subs r2, r2, r5
sbc r3, r3, r5
bl __i64_udivmod @ do unsigned division
EOR r0, r0, r10 @ apply expected sign
EOR r1, r1, r10
subs r0, r0, r10
sbc r1, r1, r10
pop {r4, r5, r6, r7, r8, r10, lr}
bx lr
ENDFUNCTION(__i64_smod)
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