diff options
Diffstat (limited to 'gcc/tree-tailcall.c')
| -rw-r--r-- | gcc/tree-tailcall.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/tree-tailcall.c b/gcc/tree-tailcall.c index 6599cbd..6e1957c 100644 --- a/gcc/tree-tailcall.c +++ b/gcc/tree-tailcall.c @@ -730,7 +730,17 @@ eliminate_tail_call (struct tailcall *t) if (!phi) { tree name = var_ann (param)->default_def; - tree new_name = make_ssa_name (param, SSA_NAME_DEF_STMT (name)); + tree new_name; + + if (!name) + { + /* It may happen that the tag does not have a default_def in case + when all uses of it are dominated by a MUST_DEF. This however + means that it is not necessary to add a phi node for this + tag. */ + continue; + } + new_name = make_ssa_name (param, SSA_NAME_DEF_STMT (name)); var_ann (param)->default_def = new_name; phi = create_phi_node (name, first); |