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| author | Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz> | 2004-08-05 10:41:57 +0200 |
|---|---|---|
| committer | Zdenek Dvorak <rakdver@gcc.gnu.org> | 2004-08-05 08:41:57 +0000 |
| commit | d36837f4cac8268ddb67fcf4f8ecfe323d79d92b (patch) | |
| tree | 6050fa494643615f796ada88dc8112f74b9e730c /gcc | |
| parent | 943bf8b5136c2d756f86a84271bbcc97b0b0bedc (diff) | |
| download | gcc-d36837f4cac8268ddb67fcf4f8ecfe323d79d92b.zip gcc-d36837f4cac8268ddb67fcf4f8ecfe323d79d92b.tar.gz gcc-d36837f4cac8268ddb67fcf4f8ecfe323d79d92b.tar.bz2 | |
re PR tree-optimization/16864 (Segmentation fault during tree tail call elimination)
PR tree-optimization/16864
* tree-tailcall.c (eliminate_tail_call): Do not create phi nodes
for ssa names without default_def.
From-SVN: r85597
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); |