derek.holloway
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55 lines
2.2 KiB
C
55 lines
2.2 KiB
C
//===-- divsc3.c - Implement __divsc3 -------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements __divsc3 for the compiler_rt library.
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//
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//===----------------------------------------------------------------------===//
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#define SINGLE_PRECISION
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#include "fp_lib.h"
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#include "int_lib.h"
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#include "int_math.h"
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// Returns: the quotient of (a + ib) / (c + id)
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COMPILER_RT_ABI Fcomplex __divsc3(float __a, float __b, float __c, float __d) {
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int __ilogbw = 0;
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float __logbw =
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__compiler_rt_logbf(__compiler_rt_fmaxX(crt_fabsf(__c), crt_fabsf(__d)));
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if (crt_isfinite(__logbw)) {
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__ilogbw = (int)__logbw;
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__c = __compiler_rt_scalbnf(__c, -__ilogbw);
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__d = __compiler_rt_scalbnf(__d, -__ilogbw);
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}
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float __denom = __c * __c + __d * __d;
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Fcomplex z;
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COMPLEX_REAL(z) =
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__compiler_rt_scalbnf((__a * __c + __b * __d) / __denom, -__ilogbw);
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COMPLEX_IMAGINARY(z) =
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__compiler_rt_scalbnf((__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) && (!crt_isnan(__a) || !crt_isnan(__b))) {
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COMPLEX_REAL(z) = crt_copysignf(CRT_INFINITY, __c) * __a;
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COMPLEX_IMAGINARY(z) = crt_copysignf(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_copysignf(crt_isinf(__a) ? 1 : 0, __a);
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__b = crt_copysignf(crt_isinf(__b) ? 1 : 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 && crt_isfinite(__a) &&
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crt_isfinite(__b)) {
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__c = crt_copysignf(crt_isinf(__c) ? 1 : 0, __c);
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__d = crt_copysignf(crt_isinf(__d) ? 1 : 0, __d);
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COMPLEX_REAL(z) = 0 * (__a * __c + __b * __d);
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COMPLEX_IMAGINARY(z) = 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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