Implementation notes: aarch64, pi4b, crypto_kem/hqc192round4

Compiler output

fft.c: In file included from fft.c:13:
fft.c: In file included from ./gf.h:11:
fft.c: /usr/lib/llvm-14/lib/clang/14.0.0/include/immintrin.h:14:2: error: "This header is only meant to be used on x86 and x64 architecture"
fft.c: #error "This header is only meant to be used on x86 and x64 architecture"
fft.c:  ^
fft.c: In file included from fft.c:13:
fft.c: In file included from ./gf.h:11:
fft.c: In file included from /usr/lib/llvm-14/lib/clang/14.0.0/include/immintrin.h:17:
fft.c: In file included from /usr/lib/llvm-14/lib/clang/14.0.0/include/x86gprintrin.h:15:
fft.c: /usr/lib/llvm-14/lib/clang/14.0.0/include/hresetintrin.h:42:27: error: invalid input constraint 'a' in asm
fft.c:   __asm__ ("hreset $0" :: "a"(__eax));
fft.c:                           ^
fft.c: In file included from fft.c:13:
fft.c: In file included from ./gf.h:11:
fft.c: In file included from /usr/lib/llvm-14/lib/clang/14.0.0/include/immintrin.h:21:
fft.c: /usr/lib/llvm-14/lib/clang/14.0.0/include/mmintrin.h:14:2: error: "This header is only meant to be used on x86 and x64 architecture"
fft.c: #error "This header is only meant to be used on x86 and x64 architecture"
fft.c:  ^
fft.c: /usr/lib/llvm-14/lib/clang/14.0.0/include/mmintrin.h:54:12: error: invalid conversion between vector type '__m64' (vector of 1 'long long' value) and integer type 'int' of different size
fft.c:     return (__m64)__builtin_ia32_vec_init_v2si(__i, 0);
fft.c:            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fft.c: /usr/lib/llvm-14/lib/clang/14.0.0/include/mmintrin.h:133:12: error: invalid conversion between vector type '__m64' (vector of 1 'long long' value) and integer type 'int' of different size
fft.c:     return (__m64)__builtin_ia32_packsswb((__v4hi)__m1, (__v4hi)__m2);
fft.c:            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fft.c: /usr/lib/llvm-14/lib/clang/14.0.0/include/mmintrin.h:163:12: error: invalid conversion between vector type '__m64' (vector of 1 'long long' value) and integer type 'int' of different size
fft.c: ...

Compiler output

fft.c: In file included from fft.c:13:
fft.c: gf.h:11:10: fatal error: immintrin.h: No such file or directory
fft.c:    11 | #include <immintrin.h>
fft.c:       |          ^~~~~~~~~~~~~
fft.c: compilation terminated.