From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53876) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f1BBZ-0001nL-Dw for qemu-devel@nongnu.org; Wed, 28 Mar 2018 09:32:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f1BBW-00084g-9D for qemu-devel@nongnu.org; Wed, 28 Mar 2018 09:32:17 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:47842 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1f1BBW-00084E-5c for qemu-devel@nongnu.org; Wed, 28 Mar 2018 09:32:14 -0400 From: Laurent Vivier Date: Wed, 28 Mar 2018 15:31:52 +0200 Message-Id: <20180328133152.24623-1-lvivier@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] [PATCH] tcg: fix 16-byte vector operations detection List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Peter Maydell , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Richard Henderson , Miroslav Rezanina , Laurent Vivier configure tries to detect if the compiler supports 16-byte vector operations. As stated in the comment of the detection program, there is a problem with the system compiler on GCC on Centos 7. This program doesn't actually detect the problem with GCC on RHEL7 on PPC64LE (Red Hat 4.8.5-28). This patch updates the test to look more like it is in QEMU helpers, and now detects the problem. The error reported is: CC ppc64-softmmu/accel/tcg/tcg-runtime-gvec.o ..//accel/tcg/tcg-runtime-gvec.c: In function =E2=80=98helper_gvec_shl8= i=E2=80=99: ../accel/tcg/tcg-runtime-gvec.c:558:26: internal compiler error: in emi= t_move_insn, at expr.c:3495 *(vec8 *)(d + i) =3D *(vec8 *)(a + i) << shift; ^ Fixes: db43267 "tcg: Add generic vector expanders" Signed-off-by: Laurent Vivier --- configure | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/configure b/configure index 4d0e92c96c..a2301dd0dc 100755 --- a/configure +++ b/configure @@ -5054,6 +5054,14 @@ static S2 c2; static S4 c4; static S8 c8; static int i; +void helper(void *d, void *a, int shift, int i); +void helper(void *d, void *a, int shift, int i) +{ + *(U1 *)(d + i) =3D *(U1 *)(a + i) << shift; + *(U2 *)(d + i) =3D *(U2 *)(a + i) << shift; + *(U4 *)(d + i) =3D *(U4 *)(a + i) << shift; + *(U8 *)(d + i) =3D *(U8 *)(a + i) << shift; +} int main(void) { a1 +=3D b1; a2 +=3D b2; a4 +=3D b4; a8 +=3D b8; --=20 2.14.3