diff options
Diffstat (limited to 'runtime/arm/i64_smod.S')
| -rw-r--r-- | runtime/arm/i64_smod.S | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/runtime/arm/i64_smod.S b/runtime/arm/i64_smod.S new file mode 100644 index 0000000..b109ecc --- /dev/null +++ b/runtime/arm/i64_smod.S @@ -0,0 +1,61 @@ +@ ***************************************************************** +@ +@ 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) |