tcg: fix 16-byte vector operations detection
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 <lvivier@redhat.com>
Reviewed-by: Miroslav Rezanina <mrezanin@redhat.com>
Message-id: 20180328133152.24623-1-lvivier@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/configure b/configure
index 4d0e92c..a2301dd 100755
--- a/configure
+++ b/configure
@@ -5054,6 +5054,14 @@
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;
