https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87812
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Without AVX, GCC treats
typedef qi __attribute__((vector_size (32))) v32qi;
as a type of 32 bytes, which is passed in memory. Clang does
# clang -S -msse2 x.c -O2
...
movaps .LCPI0_0(%rip), %xmm0 # xmm0 =
[48,49,50,51,52,53,54,55,56,57,97,98,99,100,101,102]
movaps %xmm0, %xmm1
retq
# clang -S -msse2 x.c -O2 -m32
...
movaps .LCPI0_0, %xmm0 # xmm0 =
[48,49,50,51,52,53,54,55,56,57,97,98,99,100,101,102]
movaps %xmm0, %xmm1
retl
They look very odd to me. You either pass it as a vector or you don't.
You can't have it both ways.
