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| author | Richard Sandiford <richard.sandiford@arm.com> | 2023-10-24 11:30:53 +0100 |
|---|---|---|
| committer | Richard Sandiford <richard.sandiford@arm.com> | 2023-10-24 11:30:53 +0100 |
| commit | 3e901615ff16547aaf376e7762d417b0b4d98619 (patch) | |
| tree | fae2864c8c191aa50536b5bd4c296e46a3eefbdf /gcc/rtl-ssa | |
| parent | d0eb4aceaa93eabd6153853b22e0e8c843de4184 (diff) | |
| download | gcc-3e901615ff16547aaf376e7762d417b0b4d98619.zip gcc-3e901615ff16547aaf376e7762d417b0b4d98619.tar.gz gcc-3e901615ff16547aaf376e7762d417b0b4d98619.tar.bz2 | |
rtl-ssa: Avoid creating duplicated phis
If make_uses_available was called twice for the same use,
we could end up trying to create duplicate definitions for
the same extended live range.
gcc/
* rtl-ssa/blocks.cc (function_info::create_degenerate_phi): Check
whether the requested phi already exists.
Diffstat (limited to 'gcc/rtl-ssa')
| -rw-r--r-- | gcc/rtl-ssa/blocks.cc | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/gcc/rtl-ssa/blocks.cc b/gcc/rtl-ssa/blocks.cc index d46cbf1..ecce7a6 100644 --- a/gcc/rtl-ssa/blocks.cc +++ b/gcc/rtl-ssa/blocks.cc @@ -525,6 +525,11 @@ function_info::create_phi (ebb_info *ebb, resource_info resource, phi_info * function_info::create_degenerate_phi (ebb_info *ebb, set_info *def) { + // Allow the function to be called twice in succession for the same def. + def_lookup dl = find_def (def->resource (), ebb->phi_insn ()); + if (set_info *set = dl.matching_set ()) + return as_a<phi_info *> (set); + access_info *input = def; phi_info *phi = create_phi (ebb, def->resource (), &input, 1); if (def->is_reg ()) |