[Bug dynamic-link/20139] New: Upper part of zmm is zeroed if Glibc built with --disable-multi-arch and AS not supporting AVX512

["andrew.n.senkevich at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20139

            Bug ID: 20139
           Summary: Upper part of zmm is zeroed if Glibc built with
                    --disable-multi-arch and AS not supporting AVX512
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: andrew.n.senkevich at gmail dot com
  Target Milestone: ---

cat lib-test.c
#include <immintrin.h>

int test(__m512d x)
{
  return (int)x[4];
}

gcc -mavx512f -BPATH_TO_binutils-2.25_install/bin/ -fPIC -shared lib-test.c -o
libtest-zmm.so 

cat zmm0-test.c
#include <immintrin.h>

extern int test(__m512d x);

int main()
{
  __m512d x = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0};

  return (test(x));
}

gcc -mavx512f -BPATH_TO_binutils-2.25_install/bin/ -L. -ltest-zmm zmm0-test.c
-o zmm0-test

glibc_as_2.25/lib/ld-linux-x86-64.so.2 --library-path ./ ./zmm0-test
echo $?
5

glibc_as_2.23/lib/ld-linux-x86-64.so.2 --library-path ./ ./zmm0-test
echo $?
0

Both glibc_as_2.23/ and glibc_as_2.25/ are installation paths for Glibc trunk
built with --disable-multi-arch and Binutils 2.23 / 2.25 accordingly.

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