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From: "mhillen at linux dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/101876] [s390x] vector builtin vec_permi fails to
 resolve with #pragma GCC target
Date: Wed, 18 Aug 2021 14:07:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101876

--- Comment #2 from Marius Hillenbrand <mhillen at linux dot ibm.com> ---
Narrowed down what triggers the issue after experimenting with another exam=
ple:
when the pragma sets 'vx' before the typedef, then the resulting type
definition appears broken. when enabling 'vx' only after the typedef, then =
the
example compiles successfully.

updated example:

#ifdef BROKEN
#pragma GCC target("arch=3Dz13") // note: z13 implies vx
#else
#pragma GCC target("arch=3Dz13,no-vx") // ... so turn off 'vx' again
#endif

#include <vecintrin.h>

typedef unsigned long long v2di __attribute__((vector_size(16)));

#ifndef BROKEN
#pragma GCC target("vx")
#endif

v2di foo(char *ptr) {
    v2di v =3D *(v2di *)ptr;
    v =3D vec_permi(v, v, 0);
    return v;
}

Compile fails
gcc -march=3Dz10 -O3 -DBROKEN -c -S -o- example.c
but succeeds without -DBROKEN=