0ece074de9
This version of libcompiler_rt adds support for __mulo[sdt]i4(), which computes a multiply and its overflow flag. There are also a lot of cleanup fixes to headers that don't really affect us. Updating to this revision should make it a bit easier to contribute changes back to the LLVM developers.
41 lines
853 B
C
41 lines
853 B
C
/* ===-- subvti3.c - Implement __subvti3 -----------------------------------===
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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 __subvti3 for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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#if __x86_64
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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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ti_int
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__subvti3(ti_int a, ti_int b)
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{
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ti_int s = a - 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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#endif /* __x86_64 */
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