[Bug target/57202] Please make the intrinsics headers like immintrin.h be usable without compiler flags

["noloader at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57202

--- Comment #7 from Jeffrey Walton <noloader at gmail dot com> ---
Please forgive my ignorance... What was fixed?

The problem statement is/was "Please make all headers for intrinsics be
includable without special compiler flags." But it appears the intrinsics are
not available.

I'm working with Ubuntu 16/GCC 5.4 on an old VIA C7 (SSE and SSE2, and some
other extensions):

flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge cmov pat clflush
acpi mmx fxsr sse sse2 tm nx pni est tm2 xtpr rng rng_en ace ace_en ace2
ace2_en phe phe_en pmm pmm_en

The SSSE3 intrinsics are causing a compile error:

g++ -g2 -O2 -march=native -pipe -c test.cpp
In file included from /usr/lib/gcc/i686-linux-gnu/5/include/x86intrin.h:37:0,
                 from cpu.h:40,
                 from aria.cpp:8:
/usr/lib/gcc/i686-linux-gnu/5/include/tmmintrin.h: In member function void
‘test_ssse3()’:
/usr/lib/gcc/i686-linux-gnu/5/include/tmmintrin.h:136:1: error: inlining failed
in call to always_inline ‘__m128i _mm_shuffle_epi8(__m128i, __m128i)’: target
specific option mismatch
 _mm_shuffle_epi8 (__m128i __X, __m128i __Y)


It appears the intrinsics are not available.