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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
55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/* clang-format off */
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/* ===-- fixxfdi.c - Implement __fixxfdi -----------------------------------===
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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 __fixxfdi for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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#include "libc/math.h"
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#if !(LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024)
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__static_yoink("huge_compiler_rt_license");
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#if !_ARCH_PPC
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#include "third_party/compiler_rt/int_lib.h"
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/* Returns: convert a to a signed long long, rounding toward zero. */
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/* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes
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* di_int is a 64 bit integral type
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* value in long double is representable in di_int (no range checking performed)
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*/
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/* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee |
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* 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
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*/
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COMPILER_RT_ABI di_int
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__fixxfdi(long double a)
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{
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const di_int di_max = (di_int)((~(du_int)0) / 2);
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const di_int di_min = -di_max - 1;
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long_double_bits fb;
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fb.f = a;
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int e = (fb.u.high.s.low & 0x00007FFF) - 16383;
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if (e < 0)
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return 0;
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if ((unsigned)e >= sizeof(di_int) * CHAR_BIT)
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return a > 0 ? di_max : di_min;
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di_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15);
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di_int r = fb.u.low.all;
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r = (du_int)r >> (63 - e);
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return (r ^ s) - s;
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}
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#endif /* !_ARCH_PPC */
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#endif /* long double is long */
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