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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.
.text
@@@ Signed division
.global __i64_sdiv
__i64_sdiv:
push {r4, r5, r6, r7, r8, r10, lr}
eor r10, r1, r3 @ r10 = sign of result
mov r4, r1, asr #31 @ take absolute value of N
eor r0, r0, r4 @ N = (N ^ (N >>s 31)) - (N >>s 31)
eor r1, r1, r4
subs r0, r0, r4
sbc r1, r1, r4
mov r4, r3, asr #31 @ take absolute value of D
eor r2, r2, r4
eor r3, r3, r4
subs r2, r2, r4
sbc r3, r3, r4
bl __i64_udivmod @ do unsigned division
mov r0, r4
mov r1, r5
eor r0, r0, r10, asr#31 @ apply expected sign
eor r1, r1, r10, asr#31
subs r0, r0, r10, asr#31
sbc r1, r1, r10, asr#31
pop {r4, r5, r6, r7, r8, r10, lr}
bx lr
.type __i64_sdiv, %function
.size __i64_sdiv, . - __i64_sdiv
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