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Diffstat (limited to 'compiler-rt/lib/builtins/absvdi2.c')
-rw-r--r-- | compiler-rt/lib/builtins/absvdi2.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/absvdi2.c b/compiler-rt/lib/builtins/absvdi2.c new file mode 100644 index 000000000000..b9566cd874fe --- /dev/null +++ b/compiler-rt/lib/builtins/absvdi2.c @@ -0,0 +1,25 @@ +//===-- absvdi2.c - Implement __absvdi2 -----------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// This file implements __absvdi2 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#include "int_lib.h" + +// Returns: absolute value + +// Effects: aborts if abs(x) < 0 + +COMPILER_RT_ABI di_int __absvdi2(di_int a) { + const int N = (int)(sizeof(di_int) * CHAR_BIT); + if (a == ((di_int)1 << (N - 1))) + compilerrt_abort(); + const di_int t = a >> (N - 1); + return (a ^ t) - t; +} |