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58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
/*
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* Copyright (c) 2017, Stefan Lankes, RWTH Aachen University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/* HermitCore prelude */
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#include <hermit/stddef.h>
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#include <hermit/ctype.h>
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#include <asm/limits.h>
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typedef int ti_int;
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/*
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* Workarount for the LLVM bug https://llvm.org/bugs/show_bug.cgi?id=16404
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*
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* rustc based on LLVM and uses this builtin function, which isn't part of
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* libgcc.
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*/
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ti_int
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__muloti4(ti_int a, ti_int b, int* overflow)
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{
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size_t flags;
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ti_int result;
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*overflow = 0;
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result = a * b;
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asm volatile("pushf; pop %0": "=r"(flags) : : "memory");
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if (flags & (1ULL << 11))
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*overflow = 1;
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return result;
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}
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