From ca9211ecdede9bdedb812b2243a4abdb8dacd1b9 Mon Sep 17 00:00:00 2001 From: Dimitry Andric Date: Wed, 7 Jan 2015 19:55:37 +0000 Subject: Import compiler-rt trunk r224034. https://llvm.org/svn/llvm-project/compiler-rt/trunk@224034 --- lib/builtins/absvti2.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 lib/builtins/absvti2.c (limited to 'lib/builtins/absvti2.c') diff --git a/lib/builtins/absvti2.c b/lib/builtins/absvti2.c new file mode 100644 index 0000000000000..7927770c9ab3d --- /dev/null +++ b/lib/builtins/absvti2.c @@ -0,0 +1,34 @@ +/* ===-- absvti2.c - Implement __absvdi2 -----------------------------------=== + * + * The LLVM Compiler Infrastructure + * + * This file is dual licensed under the MIT and the University of Illinois Open + * Source Licenses. See LICENSE.TXT for details. + * + * ===----------------------------------------------------------------------=== + * + * This file implements __absvti2 for the compiler_rt library. + * + * ===----------------------------------------------------------------------=== + */ + +#include "int_lib.h" + +#ifdef CRT_HAS_128BIT + +/* Returns: absolute value */ + +/* Effects: aborts if abs(x) < 0 */ + +COMPILER_RT_ABI ti_int +__absvti2(ti_int a) +{ + const int N = (int)(sizeof(ti_int) * CHAR_BIT); + if (a == ((ti_int)1 << (N-1))) + compilerrt_abort(); + const ti_int s = a >> (N - 1); + return (a ^ s) - s; +} + +#endif /* CRT_HAS_128BIT */ + -- cgit v1.2.3