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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
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/* clang-format off */
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/* ===-- floatdixf.c - Implement __floatdixf -------------------------------===
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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 __floatdixf 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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#if !_ARCH_PPC
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#include "third_party/compiler_rt/int_lib.h"
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/* Returns: convert a to a long double, rounding toward even. */
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/* Assumption: long double is a IEEE 80 bit floating point type padded to 128 bits
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* di_int is a 64 bit integral type
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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 long double
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__floatdixf(di_int a)
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{
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if (a == 0)
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return 0.0;
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const unsigned N = sizeof(di_int) * CHAR_BIT;
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const di_int s = a >> (N-1);
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a = (a ^ s) - s;
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int clz = __builtin_clzll(a);
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int e = (N - 1) - clz ; /* exponent */
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long_double_bits fb;
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fb.u.high.s.low = ((su_int)s & 0x00008000) | /* sign */
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(e + 16383); /* exponent */
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fb.u.low.all = a << clz; /* mantissa */
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return fb.f;
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}
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#endif /* !_ARCH_PPC */
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