mirror of
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
58 lines
2.3 KiB
C
58 lines
2.3 KiB
C
/* clang-format off */
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/* ===-- divdc3.c - Implement __divdc3 -------------------------------------===
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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 __divdc3 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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#define DOUBLE_PRECISION
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#include "third_party/compiler_rt/fp_lib.inc"
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#include "third_party/compiler_rt/int_lib.h"
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#include "third_party/compiler_rt/int_math.h"
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/* Returns: the quotient of (a + ib) / (c + id) */
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COMPILER_RT_ABI Dcomplex __divdc3(double __a, double __b, double __c,
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double __d) {
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int __ilogbw = 0;
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double __logbw = __compiler_rt_logb(crt_fmax(crt_fabs(__c), crt_fabs(__d)));
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if (crt_isfinite(__logbw)) {
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__ilogbw = (int)__logbw;
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__c = crt_scalbn(__c, -__ilogbw);
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__d = crt_scalbn(__d, -__ilogbw);
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}
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double __denom = __c * __c + __d * __d;
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Dcomplex z;
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COMPLEX_REAL(z) = crt_scalbn((__a * __c + __b * __d) / __denom, -__ilogbw);
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COMPLEX_IMAGINARY(z) =
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crt_scalbn((__b * __c - __a * __d) / __denom, -__ilogbw);
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if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
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if ((__denom == 0.0) && (!crt_isnan(__a) || !crt_isnan(__b))) {
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COMPLEX_REAL(z) = crt_copysign(CRT_INFINITY, __c) * __a;
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COMPLEX_IMAGINARY(z) = crt_copysign(CRT_INFINITY, __c) * __b;
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} else if ((crt_isinf(__a) || crt_isinf(__b)) && crt_isfinite(__c) &&
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crt_isfinite(__d)) {
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__a = crt_copysign(crt_isinf(__a) ? 1.0 : 0.0, __a);
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__b = crt_copysign(crt_isinf(__b) ? 1.0 : 0.0, __b);
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COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c + __b * __d);
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COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__b * __c - __a * __d);
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} else if (crt_isinf(__logbw) && __logbw > 0.0 && crt_isfinite(__a) &&
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crt_isfinite(__b)) {
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__c = crt_copysign(crt_isinf(__c) ? 1.0 : 0.0, __c);
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__d = crt_copysign(crt_isinf(__d) ? 1.0 : 0.0, __d);
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COMPLEX_REAL(z) = 0.0 * (__a * __c + __b * __d);
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COMPLEX_IMAGINARY(z) = 0.0 * (__b * __c - __a * __d);
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}
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}
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return z;
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}
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