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fa20edc44d
- Remove most __ASSEMBLER__ __LINKER__ ifdefs - Rename libc/intrin/bits.h to libc/serialize.h - Block pthread cancelation in fchmodat() polyfill - Remove `clang-format off` statements in third_party
35 lines
966 B
C
35 lines
966 B
C
/* ===-- ctzti2.c - Implement __ctzti2 -------------------------------------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is dual licensed under the MIT and the University of Illinois Open
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* Source Licenses. See LICENSE.TXT for details.
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*
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* ===----------------------------------------------------------------------===
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*
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* This file implements __ctzti2 for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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__static_yoink("huge_compiler_rt_license");
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#include "third_party/compiler_rt/int_lib.h"
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#ifdef CRT_HAS_128BIT
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/* Returns: the number of trailing 0-bits */
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/* Precondition: a != 0 */
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COMPILER_RT_ABI si_int
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__ctzti2(ti_int a)
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{
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twords x;
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x.all = a;
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const di_int f = -(x.s.low == 0);
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return __builtin_ctzll((x.s.high & f) | (x.s.low & ~f)) +
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((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT)));
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}
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#endif /* CRT_HAS_128BIT */
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