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# SPDX-License-Identifier: 0BSD
#############################################################################
#
# tuklib_integer.cmake - see tuklib_integer.m4 for description and comments
#
# Author: Lasse Collin
#
#############################################################################
include("${CMAKE_CURRENT_LIST_DIR}/tuklib_common.cmake")
include(TestBigEndian)
include(CheckCSourceCompiles)
include(CheckIncludeFile)
include(CheckSymbolExists)
function(tuklib_integer TARGET_OR_ALL)
# Check for endianness. Unlike the Autoconf's AC_C_BIGENDIAN, this doesn't
# support Apple universal binaries. The CMake module will leave the
# variable unset so we can catch that situation here instead of continuing
# as if we were little endian.
test_big_endian(WORDS_BIGENDIAN)
if(NOT DEFINED WORDS_BIGENDIAN)
message(FATAL_ERROR "Cannot determine endianness")
endif()
tuklib_add_definition_if("${TARGET_OR_ALL}" WORDS_BIGENDIAN)
# Look for a byteswapping method.
check_c_source_compiles("
int main(void)
{
__builtin_bswap16(1);
__builtin_bswap32(1);
__builtin_bswap64(1);
return 0;
}
"
HAVE___BUILTIN_BSWAPXX)
if(HAVE___BUILTIN_BSWAPXX)
tuklib_add_definitions("${TARGET_OR_ALL}" HAVE___BUILTIN_BSWAPXX)
else()
check_include_file(byteswap.h HAVE_BYTESWAP_H)
if(HAVE_BYTESWAP_H)
tuklib_add_definitions("${TARGET_OR_ALL}" HAVE_BYTESWAP_H)
check_symbol_exists(bswap_16 byteswap.h HAVE_BSWAP_16)
tuklib_add_definition_if("${TARGET_OR_ALL}" HAVE_BSWAP_16)
check_symbol_exists(bswap_32 byteswap.h HAVE_BSWAP_32)
tuklib_add_definition_if("${TARGET_OR_ALL}" HAVE_BSWAP_32)
check_symbol_exists(bswap_64 byteswap.h HAVE_BSWAP_64)
tuklib_add_definition_if("${TARGET_OR_ALL}" HAVE_BSWAP_64)
else()
check_include_file(sys/endian.h HAVE_SYS_ENDIAN_H)
if(HAVE_SYS_ENDIAN_H)
tuklib_add_definitions("${TARGET_OR_ALL}" HAVE_SYS_ENDIAN_H)
else()
check_include_file(sys/byteorder.h HAVE_SYS_BYTEORDER_H)
tuklib_add_definition_if("${TARGET_OR_ALL}"
HAVE_SYS_BYTEORDER_H)
endif()
endif()
endif()
# Guess that unaligned access is fast on these archs:
# - 32/64-bit x86 / x86-64
# - 32/64-bit big endian PowerPC
# - 64-bit little endian PowerPC
# - Some 32-bit ARM
# - Some 64-bit ARM64 (AArch64)
# - Some 32/64-bit RISC-V
#
# CMake doesn't provide a standardized/normalized list of processor arch
# names. For example, x86-64 may be "x86_64" (Linux), "AMD64" (Windows),
# or even "EM64T" (64-bit WinXP).
set(FAST_UNALIGNED_GUESS OFF)
string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" PROCESSOR)
# There is no ^ in the first regex branch to allow "i" at the beginning
# so it can match "i386" to "i786", and "x86_64".
if(PROCESSOR MATCHES "[x34567]86|^x64|^amd64|^em64t")
set(FAST_UNALIGNED_GUESS ON)
elseif(PROCESSOR MATCHES "^powerpc|^ppc")
if(WORDS_BIGENDIAN OR PROCESSOR MATCHES "64")
set(FAST_UNALIGNED_GUESS ON)
endif()
elseif(PROCESSOR MATCHES "^arm|^aarch64|^riscv")
# On 32-bit and 64-bit ARM, GCC and Clang
# #define __ARM_FEATURE_UNALIGNED if
# unaligned access is supported.
#
# Exception: GCC at least up to 13.2.0
# defines it even when using -mstrict-align
# so in that case this autodetection goes wrong.
# Most of the time -mstrict-align isn't used so it
# shouldn't be a common problem in practice. See:
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111555
#
# RISC-V C API Specification says that if
# __riscv_misaligned_fast is defined then
# unaligned access is known to be fast.
#
# MSVC is handled as a special case: We assume that
# 32/64-bit ARM supports fast unaligned access.
# If MSVC gets RISC-V support then this will assume
# fast unaligned access on RISC-V too.
check_c_source_compiles("
#if !defined(__ARM_FEATURE_UNALIGNED) \
&& !defined(__riscv_misaligned_fast) \
&& !defined(_MSC_VER)
compile error
#endif
int main(void) { return 0; }
"
TUKLIB_FAST_UNALIGNED_DEFINED_BY_PREPROCESSOR)
if(TUKLIB_FAST_UNALIGNED_DEFINED_BY_PREPROCESSOR)
set(FAST_UNALIGNED_GUESS ON)
endif()
endif()
option(TUKLIB_FAST_UNALIGNED_ACCESS
"Enable if the system supports *fast* unaligned memory access \
with 16-bit, 32-bit, and 64-bit integers."
"${FAST_UNALIGNED_GUESS}")
tuklib_add_definition_if("${TARGET_OR_ALL}" TUKLIB_FAST_UNALIGNED_ACCESS)
# Unsafe type punning:
option(TUKLIB_USE_UNSAFE_TYPE_PUNNING
"This introduces strict aliasing violations and \
may result in broken code. However, this might improve performance \
in some cases, especially with old compilers \
(e.g. GCC 3 and early 4.x on x86, GCC < 6 on ARMv6 and ARMv7)."
OFF)
tuklib_add_definition_if("${TARGET_OR_ALL}" TUKLIB_USE_UNSAFE_TYPE_PUNNING)
# Check for GCC/Clang __builtin_assume_aligned().
check_c_source_compiles(
"int main(void) { __builtin_assume_aligned(\"\", 1); return 0; }"
HAVE___BUILTIN_ASSUME_ALIGNED)
tuklib_add_definition_if("${TARGET_OR_ALL}" HAVE___BUILTIN_ASSUME_ALIGNED)
endfunction()
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