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Diffstat (limited to 'lib/builtins/absvdi2.c')
-rw-r--r-- | lib/builtins/absvdi2.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/builtins/absvdi2.c b/lib/builtins/absvdi2.c new file mode 100644 index 000000000000..682c2355d2ac --- /dev/null +++ b/lib/builtins/absvdi2.c @@ -0,0 +1,29 @@ +/*===-- absvdi2.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 __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; +} |