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 ‘helper_gvec_shl8i’: ../accel/tcg/tcg-runtime-gvec.c:558:26: internal compiler error: in emit_move_insn, at expr.c:3495 *(vec8 *)(d + i) = *(vec8 *)(a + i) << shift; ^ Fixes: db43267 "tcg: Add generic vector expanders" Signed-off-by: Laurent Vivier <lviv...@redhat.com> --- 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) = *(U1 *)(a + i) << shift; + *(U2 *)(d + i) = *(U2 *)(a + i) << shift; + *(U4 *)(d + i) = *(U4 *)(a + i) << shift; + *(U8 *)(d + i) = *(U8 *)(a + i) << shift; +} int main(void) { a1 += b1; a2 += b2; a4 += b4; a8 += b8; -- 2.14.3