hjl.tools added a comment.
In https://reviews.llvm.org/D53919#1282811, @efriedma wrote:
> No, AVX512 wasn't even announced when clang 3.3 came out.
Try this with clang 3.3 and clang 7.0.
[hjl@gnu-cfl-1 tmp]$ cat z.c
typedef int __attribute__((mode(SI))) si;
typedef si __attribute__((vector_size (64))) v;
v
foo (void)
{
v y = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' };
return y;
}
[hjl@gnu-cfl-1 tmp]$ gcc -S -O2 z.c
z.c: In function ‘foo’:
z.c:6:1: warning: AVX512F vector return without AVX512F enabled changes the ABI
[-Wpsabi]
{
^
[hjl@gnu-cfl-1 tmp]$
Repository:
rC Clang
https://reviews.llvm.org/D53919
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