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| author | Richard Biener <rguenther@suse.de> | 2023-03-29 11:59:16 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2023-03-29 13:55:47 +0200 |
| commit | 86efc490ab86bfa00720479b4714da23cd7df797 (patch) | |
| tree | 6c2f1d51e1efaf67f8db6ce855fe989921ccc2e5 | |
| parent | ad32fcb8e91ba85cb4676c6249b6adc4b0daf9df (diff) | |
| download | gcc-86efc490ab86bfa00720479b4714da23cd7df797.zip gcc-86efc490ab86bfa00720479b4714da23cd7df797.tar.gz gcc-86efc490ab86bfa00720479b4714da23cd7df797.tar.bz2 | |
tree-optimization/109331 - make sure to clean up the CFG after forwprop
When forwprop discovers unreachable code or makes decisions based
on unreachable edges make sure to cleanup the CFG since otherwise
SSA form can become invalid.
PR tree-optimization/109331
* tree-ssa-forwprop.cc (pass_forwprop::execute): When we
discover a taken edge make sure to cleanup the CFG.
* gcc.dg/torture/pr109331.c: New testcase.
| -rw-r--r-- | gcc/testsuite/gcc.dg/torture/pr109331.c | 16 | ||||
| -rw-r--r-- | gcc/tree-ssa-forwprop.cc | 6 |
2 files changed, 21 insertions, 1 deletions
diff --git a/gcc/testsuite/gcc.dg/torture/pr109331.c b/gcc/testsuite/gcc.dg/torture/pr109331.c new file mode 100644 index 0000000..72c57b9 --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/pr109331.c @@ -0,0 +1,16 @@ +/* { dg-do compile } */ + +char *ustol_dpp; +void ustol(int flags) +{ + char *s; + if (s) + flags |= 3; + switch (flags & 3) + case 3: + while (*s) + case '+': + ++s; + if (flags) + ustol_dpp = s; +} diff --git a/gcc/tree-ssa-forwprop.cc b/gcc/tree-ssa-forwprop.cc index bb0fa30..9b56744 100644 --- a/gcc/tree-ssa-forwprop.cc +++ b/gcc/tree-ssa-forwprop.cc @@ -4046,7 +4046,11 @@ pass_forwprop::execute (function *fun) /* Mark outgoing exectuable edges. */ if (edge e = find_taken_edge (bb, NULL)) - e->flags |= EDGE_EXECUTABLE; + { + e->flags |= EDGE_EXECUTABLE; + if (EDGE_COUNT (bb->succs) > 1) + cfg_changed = true; + } else { FOR_EACH_EDGE (e, ei, bb->succs) |