llvm-project

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//===-- subvti3.c - Implement __subvti3 -----------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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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#include "int_lib.h"
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#ifdef CRT_HAS_128BIT
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// Returns: a - b
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// Effects: aborts if a - b overflows
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COMPILER_RT_ABI ti_int __subvti3(ti_int a, ti_int b) {
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  ti_int s = (tu_int)a - (tu_int)b;
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  if (b >= 0) {
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    if (s > a)
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      compilerrt_abort();
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  } else {
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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 // CRT_HAS_128BIT
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