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Diffstat (limited to 'runtime/arm/i64_sdiv.s')
| -rw-r--r-- | runtime/arm/i64_sdiv.s | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/runtime/arm/i64_sdiv.s b/runtime/arm/i64_sdiv.s new file mode 100644 index 0000000..e96008d --- /dev/null +++ b/runtime/arm/i64_sdiv.s @@ -0,0 +1,66 @@ +@ ***************************************************************** +@ +@ 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 + |