[Bug target/102166] [i386] AMX intrinsics and macros not defined in C++

[thiago at kde dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102166

--- Comment #2 from Thiago Macieira <thiago at kde dot org> ---
FYI:

$ cat test.cpp
#include <immintrin.h>

__attribute__((target("avx"))) void avx()
{
    _mm256_zeroall();
}

#ifndef __INTEL_COMPILER
__attribute__((target("amx-tile")))
#endif
void amx()
{
    _tile_loadd(0, 0, 0);
    _tile_release();
}
$ icc -c test.cpp && echo success
success
$ icc -c -xc test.cpp && echo success
success
$ clang -c -xc test.cpp && echo success
success
$ clang -c test.cpp && echo success    
success

$ clang --version
clang version 11.1.0
Target: x86_64-generic-linux
Thread model: posix
InstalledDir: /usr/bin
$ icc --version
icc (ICC) 19.1.3.304 20200925
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