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author | Dimitry Andric <dim@FreeBSD.org> | 2015-01-07 19:55:37 +0000 |
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committer | Dimitry Andric <dim@FreeBSD.org> | 2015-01-07 19:55:37 +0000 |
commit | ca9211ecdede9bdedb812b2243a4abdb8dacd1b9 (patch) | |
tree | 9b19e801150082c33e9152275829a6ce90614b55 /lib/builtins/ashlti3.c | |
parent | 8ef50bf3d1c287b5013c3168de77a462dfce3495 (diff) | |
download | src-ca9211ecdede9bdedb812b2243a4abdb8dacd1b9.tar.gz src-ca9211ecdede9bdedb812b2243a4abdb8dacd1b9.zip |
Import compiler-rt trunk r224034.vendor/compiler-rt/compiler-rt-r224034
Notes
Notes:
svn path=/vendor/compiler-rt/dist/; revision=276789
svn path=/vendor/compiler-rt/compiler-rt-r224034/; revision=276790; tag=vendor/compiler-rt/compiler-rt-r224034
Diffstat (limited to 'lib/builtins/ashlti3.c')
-rw-r--r-- | lib/builtins/ashlti3.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/builtins/ashlti3.c b/lib/builtins/ashlti3.c new file mode 100644 index 000000000000..638ae845ff04 --- /dev/null +++ b/lib/builtins/ashlti3.c @@ -0,0 +1,45 @@ +/* ===-- ashlti3.c - Implement __ashlti3 -----------------------------------=== + * + * 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 __ashlti3 for the compiler_rt library. + * + * ===----------------------------------------------------------------------=== + */ + +#include "int_lib.h" + +#ifdef CRT_HAS_128BIT + +/* Returns: a << b */ + +/* Precondition: 0 <= b < bits_in_tword */ + +COMPILER_RT_ABI ti_int +__ashlti3(ti_int a, si_int b) +{ + const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT); + twords input; + twords result; + input.all = a; + if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */ + { + result.s.low = 0; + result.s.high = input.s.low << (b - bits_in_dword); + } + else /* 0 <= b < bits_in_dword */ + { + if (b == 0) + return a; + result.s.low = input.s.low << b; + result.s.high = (input.s.high << b) | (input.s.low >> (bits_in_dword - b)); + } + return result.all; +} + +#endif /* CRT_HAS_128BIT */ |