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https://github.com/jart/cosmopolitan.git
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7e0a09feec
This change ports APE Loader to Linux AARCH64, so that Raspberry Pi users can run programs like redbean, without the executable needing to modify itself. Progress has also slipped into this change on the issue of making progress better conforming to user expectations and industry standards regarding which symbols we're allowed to declare
43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/* clang-format off */
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/* ===-- ctzdi2.c - Implement __ctzdi2 -------------------------------------===
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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 __ctzdi2 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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/* Returns: the number of trailing 0-bits */
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#if !defined(__clang__) && \
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((defined(__sparc__) && defined(__arch64__)) || \
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defined(__mips64) || \
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(defined(__riscv) && __SIZEOF_POINTER__ >= 8))
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/* On 64-bit architectures with neither a native clz instruction nor a native
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* ctz instruction, gcc resolves __builtin_ctz to __ctzdi2 rather than
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* __ctzsi2, leading to infinite recursion. */
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#define __builtin_ctz(a) __ctzsi2(a)
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extern si_int __ctzsi2(si_int);
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#endif
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/* Precondition: a != 0 */
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COMPILER_RT_ABI si_int
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__ctzdi2(di_int a)
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{
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dwords x;
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x.all = a;
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const si_int f = -(x.s.low == 0);
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return __builtin_ctz((x.s.high & f) | (x.s.low & ~f)) +
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(f & ((si_int)(sizeof(si_int) * CHAR_BIT)));
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}
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