diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/tree-tailcall.c | 12 |
2 files changed, 17 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 5df2195..f0e7617 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2004-08-05 Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz> + + PR tree-optimization/16864 + * tree-tailcall.c (eliminate_tail_call): Do not create phi nodes + for ssa names without default_def. + 2004-08-05 Richard Sandiford <rsandifo@redhat.com> * config/i386/i386.c (ix86_expand_prologue): If the function uses a 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); |