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[libc][complex] implement different flavors of creal and cimag functions (#113300)
I have commented out the test for `neg_zero`(creal) because : 1. real(neg_zero + 0.0i) equals zero. 2. real(neg_zero - 0.0i) equals neg_zero. I am not sure if this is the intended behaviour. [EDIT] I have updated tests for `neg_zero` (creal) to be : ``` EXPECT_FP_EQ(func(CFPT(neg_zero - zero * 1.0i)), neg_zero); EXPECT_FP_EQ(func(CFPT(neg_zero + zero * 1.0i)), zero); ``` because all three [gcc, clang and GNU MPC] also give the same result. https://godbolt.org/z/hxhcn6aof and it seems that it is indeed the correct behaviour since Imaginary types are not supported yet, refer #113671
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‎libc/config/linux/aarch64/entrypoints.txt

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@@ -356,6 +356,14 @@ if(LLVM_LIBC_INCLUDE_SCUDO)
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endif()
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set(TARGET_LIBM_ENTRYPOINTS
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# complex.h entrypoints
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libc.src.complex.creal
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libc.src.complex.crealf
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libc.src.complex.creall
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libc.src.complex.cimag
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libc.src.complex.cimagf
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libc.src.complex.cimagl
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# fenv.h entrypoints
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libc.src.fenv.feclearexcept
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libc.src.fenv.fedisableexcept
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if(LIBC_TYPES_HAS_FLOAT16)
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list(APPEND TARGET_LIBM_ENTRYPOINTS
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# complex.h C23 _Complex _Float16 entrypoints
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libc.src.complex.crealf16
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libc.src.complex.cimagf16
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# math.h C23 _Float16 entrypoints
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libc.src.math.canonicalizef16
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libc.src.math.ceilf16
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if(LIBC_TYPES_HAS_FLOAT128)
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list(APPEND TARGET_LIBM_ENTRYPOINTS
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# complex.h C23 _Complex _Float128 entrypoints
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libc.src.complex.crealf128
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libc.src.complex.cimagf128
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# math.h C23 _Float128 entrypoints
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libc.src.math.canonicalizef128
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libc.src.math.ceilf128

‎libc/config/linux/arm/entrypoints.txt

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@@ -197,6 +197,14 @@ if(LLVM_LIBC_INCLUDE_SCUDO)
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endif()
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set(TARGET_LIBM_ENTRYPOINTS
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# complex.h entrypoints
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libc.src.complex.creal
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libc.src.complex.crealf
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libc.src.complex.creall
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libc.src.complex.cimag
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libc.src.complex.cimagf
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libc.src.complex.cimagl
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# fenv.h entrypoints
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libc.src.fenv.feclearexcept
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libc.src.fenv.fedisableexcept

‎libc/config/linux/riscv/entrypoints.txt

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endif()
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set(TARGET_LIBM_ENTRYPOINTS
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# complex.h entrypoints
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libc.src.complex.creal
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libc.src.complex.crealf
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libc.src.complex.creall
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libc.src.complex.cimag
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libc.src.complex.cimagf
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libc.src.complex.cimagl
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# fenv.h entrypoints
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libc.src.fenv.feclearexcept
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libc.src.fenv.fedisableexcept
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if(LIBC_TYPES_HAS_FLOAT128)
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list(APPEND TARGET_LIBM_ENTRYPOINTS
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# complex.h C23 _Complex _Float128 entrypoints
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libc.src.complex.crealf128
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libc.src.complex.cimagf128
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# math.h C23 _Float128 entrypoints
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libc.src.math.canonicalizef128
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libc.src.math.ceilf128

‎libc/config/linux/x86_64/entrypoints.txt

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endif()
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set(TARGET_LIBM_ENTRYPOINTS
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# complex.h entrypoints
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libc.src.complex.creal
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libc.src.complex.crealf
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libc.src.complex.creall
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libc.src.complex.cimag
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libc.src.complex.cimagf
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libc.src.complex.cimagl
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# fenv.h entrypoints
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libc.src.fenv.feclearexcept
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libc.src.fenv.fedisableexcept
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if(LIBC_TYPES_HAS_FLOAT16)
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list(APPEND TARGET_LIBM_ENTRYPOINTS
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# complex.h C23 _Complex _Float16 entrypoints
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libc.src.complex.crealf16
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libc.src.complex.cimagf16
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# math.h C23 _Float16 entrypoints
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libc.src.math.canonicalizef16
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libc.src.math.ceilf16
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if(LIBC_TYPES_HAS_FLOAT128)
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list(APPEND TARGET_LIBM_ENTRYPOINTS
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# complex.h C23 _Complex _Float128 entrypoints
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libc.src.complex.crealf128
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libc.src.complex.cimagf128
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# math.h C23 _Float128 entrypoints
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libc.src.math.canonicalizef128
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libc.src.math.ceilf128

‎libc/docs/complex.rst

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+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| carg | | | | | | 7.3.9.1 | N/A |
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+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| cimag | | | | | | 7.3.9.2 | N/A |
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| cimag | |check| | |check| | |check| | |check| | |check| | 7.3.9.2 | N/A |
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+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| conj | | | | | | 7.3.9.4 | N/A |
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+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| cproj | | | | | | 7.3.9.5 | N/A |
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+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| creal | | | | | | 7.3.9.6 | N/A |
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| creal | |check| | |check| | |check| | |check| | |check| | 7.3.9.6 | N/A |
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+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+

‎libc/src/CMakeLists.txt

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add_subdirectory(__support)
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add_subdirectory(complex)
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add_subdirectory(ctype)
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add_subdirectory(dlfcn)
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add_subdirectory(errno)

‎libc/src/__support/CMakeLists.txt

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libc.src.__support.CPP.limits
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)
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add_header_library(
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complex_type
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HDRS
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complex_type.h
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)
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add_header_library(
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integer_operations
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HDRS

‎libc/src/__support/complex_type.h

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//===-- complex type --------------------------------------------*- C++ -*-===//
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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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#ifndef LLVM_LIBC_SRC___SUPPORT_COMPLEX_TYPE_H
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#define LLVM_LIBC_SRC___SUPPORT_COMPLEX_TYPE_H
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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template <typename T> struct Complex {
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T real;
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T imag;
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};
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC___SUPPORT_COMPLEX_TYPE_H

‎libc/src/complex/CMakeLists.txt

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add_subdirectory(generic)
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function(add_complex_entrypoint_object name)
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get_fq_target_name("generic.${name}" fq_generic_target_name)
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if(TARGET ${fq_generic_target_name})
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add_entrypoint_object(
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${name}
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ALIAS
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DEPENDS
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.generic.${name}
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)
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return()
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endif()
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endfunction()
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add_complex_entrypoint_object(creal)
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add_complex_entrypoint_object(crealf)
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add_complex_entrypoint_object(creall)
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add_complex_entrypoint_object(crealf16)
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add_complex_entrypoint_object(crealf128)
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add_complex_entrypoint_object(cimag)
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add_complex_entrypoint_object(cimagf)
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add_complex_entrypoint_object(cimagl)
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add_complex_entrypoint_object(cimagf16)
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add_complex_entrypoint_object(cimagf128)

‎libc/src/complex/cimag.h

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//===-- Implementation header for cimag -------------------------*- C++ -*-===//
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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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#ifndef LLVM_LIBC_SRC_COMPLEX_CIMAG_H
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#define LLVM_LIBC_SRC_COMPLEX_CIMAG_H
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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double cimag(_Complex double x);
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_COMPLEX_CIMAG_H

‎libc/src/complex/cimagf.h

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//===-- Implementation header for cimagf ------------------------*- C++ -*-===//
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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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#ifndef LLVM_LIBC_SRC_COMPLEX_CIMAGF_H
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#define LLVM_LIBC_SRC_COMPLEX_CIMAGF_H
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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float cimagf(_Complex float x);
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_COMPLEX_CIMAGF_H

‎libc/src/complex/cimagf128.h

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//===-- Implementation header for cimagf128 ---------------------*- C++ -*-===//
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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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#include "src/__support/macros/properties/complex_types.h"
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#include "src/__support/macros/properties/types.h"
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#if defined(LIBC_TYPES_HAS_CFLOAT128)
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#ifndef LLVM_LIBC_SRC_COMPLEX_CIMAGF128_H
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#define LLVM_LIBC_SRC_COMPLEX_CIMAGF128_H
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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float128 cimagf128(cfloat128 x);
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_COMPLEX_CIMAGF128_H
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#endif // LIBC_TYPES_HAS_CFLOAT128

‎libc/src/complex/cimagf16.h

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//===-- Implementation header for cimagf16 ----------------------*- C++ -*-===//
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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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#include "src/__support/macros/properties/complex_types.h"
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#include "src/__support/macros/properties/types.h"
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#if defined(LIBC_TYPES_HAS_CFLOAT16)
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#ifndef LLVM_LIBC_SRC_COMPLEX_CIMAGF16_H
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#define LLVM_LIBC_SRC_COMPLEX_CIMAGF16_H
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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float16 cimagf16(cfloat16 x);
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_COMPLEX_CIMAGF16_H
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#endif // LIBC_TYPES_HAS_CFLOAT16

‎libc/src/complex/cimagl.h

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//===-- Implementation header for cimagl ------------------------*- C++ -*-===//
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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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#ifndef LLVM_LIBC_SRC_COMPLEX_CIMAGL_H
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#define LLVM_LIBC_SRC_COMPLEX_CIMAGL_H
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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long double cimagl(_Complex long double x);
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_COMPLEX_CIMAGL_H

‎libc/src/complex/creal.h

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//===-- Implementation header for creal -------------------------*- C++ -*-===//
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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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#ifndef LLVM_LIBC_SRC_COMPLEX_CREAL_H
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#define LLVM_LIBC_SRC_COMPLEX_CREAL_H
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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double creal(_Complex double x);
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_COMPLEX_CREAL_H

‎libc/src/complex/crealf.h

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//===-- Implementation header for crealf ------------------------*- C++ -*-===//
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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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#ifndef LLVM_LIBC_SRC_COMPLEX_CREALF_H
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#define LLVM_LIBC_SRC_COMPLEX_CREALF_H
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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float crealf(_Complex float x);
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_COMPLEX_CREALF_H

‎libc/src/complex/crealf128.h

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//===-- Implementation header for crealf128 ---------------------*- C++ -*-===//
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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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#include "src/__support/macros/properties/complex_types.h"
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#include "src/__support/macros/properties/types.h"
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#if defined(LIBC_TYPES_HAS_CFLOAT128)
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#ifndef LLVM_LIBC_SRC_COMPLEX_CREALF128_H
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#define LLVM_LIBC_SRC_COMPLEX_CREALF128_H
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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float128 crealf128(cfloat128 x);
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_COMPLEX_CREALF128_H
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#endif // LIBC_TYPES_HAS_CFLOAT128

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