r0 on the v850 is a hardwired 0 value. For reasons unknown I exposed it
in the register file.
This runs afoul of tree-ssa/asm-2.c which has a local variable
explicitly assigned to register 0. This naturally blows up.
The fix is trivial, use a different register like other ports do.
Installing on the trunk.
Jeff
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 8496a38c291..4952b18983f 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2018-07-05 Jeff Law <l...@redhat.com>
+
+ * gcc.dg/tree-ssa/asm-2.c (REGISTER): Override for v850 too.
+
2018-07-05 Paul Thomas <pa...@gcc.gnu.org>
PR fortran/86408
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/asm-2.c
b/gcc/testsuite/gcc.dg/tree-ssa/asm-2.c
index 4dc4a9d6c6a..00c3079181d 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/asm-2.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/asm-2.c
@@ -1,7 +1,7 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
-#ifdef __hppa__
+#if defined(__hppa__) || defined(__v850__)
#define REGISTER "1"
#else
#ifdef __moxie__
