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workarount for the LLVM bug https://llvm.org/bugs/show_bug.cgi?id=16404

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rustc based on LLVM and uses this builtin function, which isn't part of
our libgcc.
This commit is contained in:
Stefan Lankes 2017-07-17 22:38:00 +02:00
parent 236583a19e
commit 5c21ed73c1
1 changed files with 58 additions and 0 deletions
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libkern/muloti4.c Normal file
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/*
* Copyright (c) 2017, Stefan Lankes, RWTH Aachen University.
* All rights reserved.
*
* 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 University 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 REGENTS 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 THE REGENTS OR CONTRIBUTORS 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.
*
*/
/* HermitCore prelude */
#include <hermit/stddef.h>
#include <hermit/ctype.h>
#include <asm/limits.h>
typedef int ti_int;
/*
* Workarount for the LLVM bug https://llvm.org/bugs/show_bug.cgi?id=16404
*
* rustc based on LLVM and uses this builtin function, which isn't part of
* libgcc.
*/
ti_int
__muloti4(ti_int a, ti_int b, int* overflow)
{
size_t flags;
ti_int result;
*overflow = 0;
result = a * b;
asm volatile("pushf; pop %0": "=r"(flags) : : "memory");
if (flags & (1ULL << 11))
*overflow = 1;
return result;
}