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ec9a8c8b10
The code in {add,sub}v.i3 routines does not trap when it should, because
it performs the actual add/subtract operation in signed arithmetic,
rather than unsigned.
Patch by Francois-Xavie Coudert!
llvm-svn: 221826
37 lines
852 B
C
37 lines
852 B
C
/* ===-- subvsi3.c - Implement __subvsi3 -----------------------------------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is dual licensed under the MIT and the University of Illinois Open
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* Source Licenses. See LICENSE.TXT for details.
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*
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* ===----------------------------------------------------------------------===
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*
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* This file implements __subvsi3 for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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#include "int_lib.h"
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/* Returns: a - b */
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/* Effects: aborts if a - b overflows */
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COMPILER_RT_ABI si_int
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__subvsi3(si_int a, si_int b)
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{
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si_int s = (su_int) a - (su_int) b;
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if (b >= 0)
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{
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if (s > a)
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compilerrt_abort();
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}
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else
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{
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if (s <= a)
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compilerrt_abort();
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}
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return s;
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}
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