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llvm-project/compiler-rt/lib/builtins/divtc3.c

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Add a generic version of __divtc3.c for long double complex division. Mark the unit test as applying to all platforms. llvm-svn: 253831
2015-11-23 03:13:49 +08:00
/*===-- divtc3.c - Implement __divtc3 -------------------------------------===
*
Update more file headers across all of the LLVM projects in the monorepo to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
2019-01-19 18:56:40 +08:00
* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
* See https://llvm.org/LICENSE.txt for license information.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
Add a generic version of __divtc3.c for long double complex division. Mark the unit test as applying to all platforms. llvm-svn: 253831
2015-11-23 03:13:49 +08:00
*
* ===----------------------------------------------------------------------===
*
* This file implements __divtc3 for the compiler_rt library.
*
*===----------------------------------------------------------------------===
*/
[compiler-rt] [builtins] Add logb/logbf/logbl methods to compiler-rt to avoid libm dependencies when possible. Summary: The complex division builtins (div?c3) use logb methods from libm to scale numbers during division and avoid rounding issues. However, these come from libm, meaning anyone that uses --rtlib=compiler-rt also has to include -lm. Implement logb* methods for standard ieee 754 floats so we can avoid -lm on those platforms, falling back to the old behavior (using either logb() or `__builtin_logb()`) when not supported. These new methods are defined internally as `__compiler_rt_logb` so as not to conflict with the libm definitions in any way. This fixes just the libm methods mentioned in PR32279 and PR28652. libc is still required, although that seems to not be an issue. Note: this is proposed as an alternative to just adding -lm: D49330. Reviewers: efriedma, compnerd, scanon, echristo Reviewed By: echristo Subscribers: jsji, echristo, nemanjai, dberris, mgorny, kbarton, delcypher, llvm-commits, #sanitizers Differential Revision: https://reviews.llvm.org/D49514 llvm-svn: 342917
2018-09-25 04:39:19 +08:00
#define QUAD_PRECISION
#include "fp_lib.h"
Add a generic version of __divtc3.c for long double complex division. Mark the unit test as applying to all platforms. llvm-svn: 253831
2015-11-23 03:13:49 +08:00
#include "int_lib.h"
#include "int_math.h"
/* Returns: the quotient of (a + ib) / (c + id) */
[builtins] Reformat builtins with clang-format Update formatting to use the LLVM style. This is part of the cleanup proposed in "[RFC] compiler-rt builtins cleanup and refactoring". Differential Revision: https://reviews.llvm.org/D60351 llvm-svn: 359410
2019-04-29 05:53:32 +08:00
COMPILER_RT_ABI Lcomplex __divtc3(long double __a, long double __b,
long double __c, long double __d) {
int __ilogbw = 0;
long double __logbw =
__compiler_rt_logbl(crt_fmaxl(crt_fabsl(__c), crt_fabsl(__d)));
if (crt_isfinite(__logbw)) {
__ilogbw = (int)__logbw;
__c = crt_scalbnl(__c, -__ilogbw);
__d = crt_scalbnl(__d, -__ilogbw);
}
long double __denom = __c * __c + __d * __d;
Lcomplex z;
COMPLEX_REAL(z) = crt_scalbnl((__a * __c + __b * __d) / __denom, -__ilogbw);
COMPLEX_IMAGINARY(z) =
crt_scalbnl((__b * __c - __a * __d) / __denom, -__ilogbw);
if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
if ((__denom == 0.0) && (!crt_isnan(__a) || !crt_isnan(__b))) {
COMPLEX_REAL(z) = crt_copysignl(CRT_INFINITY, __c) * __a;
COMPLEX_IMAGINARY(z) = crt_copysignl(CRT_INFINITY, __c) * __b;
} else if ((crt_isinf(__a) || crt_isinf(__b)) && crt_isfinite(__c) &&
crt_isfinite(__d)) {
__a = crt_copysignl(crt_isinf(__a) ? 1.0 : 0.0, __a);
__b = crt_copysignl(crt_isinf(__b) ? 1.0 : 0.0, __b);
COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c + __b * __d);
COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__b * __c - __a * __d);
} else if (crt_isinf(__logbw) && __logbw > 0.0 && crt_isfinite(__a) &&
crt_isfinite(__b)) {
__c = crt_copysignl(crt_isinf(__c) ? 1.0 : 0.0, __c);
__d = crt_copysignl(crt_isinf(__d) ? 1.0 : 0.0, __d);
COMPLEX_REAL(z) = 0.0 * (__a * __c + __b * __d);
COMPLEX_IMAGINARY(z) = 0.0 * (__b * __c - __a * __d);
Add a generic version of __divtc3.c for long double complex division. Mark the unit test as applying to all platforms. llvm-svn: 253831
2015-11-23 03:13:49 +08:00
}
[builtins] Reformat builtins with clang-format Update formatting to use the LLVM style. This is part of the cleanup proposed in "[RFC] compiler-rt builtins cleanup and refactoring". Differential Revision: https://reviews.llvm.org/D60351 llvm-svn: 359410
2019-04-29 05:53:32 +08:00
}
return z;
Add a generic version of __divtc3.c for long double complex division. Mark the unit test as applying to all platforms. llvm-svn: 253831
2015-11-23 03:13:49 +08:00
}