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| author | Richard Biener <rguenther@suse.de> | 2025-09-02 10:16:28 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2025-09-02 18:14:13 +0200 |
| commit | edeb5b8258382a58e1ce8e1e79e61386250d42b2 (patch) | |
| tree | 24fa9ee7bfb21b2b687207f764fb3974664804b7 | |
| parent | 9bbf0996bfcd249ef474a3da19831f66a8714319 (diff) | |
| download | gcc-edeb5b8258382a58e1ce8e1e79e61386250d42b2.zip gcc-edeb5b8258382a58e1ce8e1e79e61386250d42b2.tar.gz gcc-edeb5b8258382a58e1ce8e1e79e61386250d42b2.tar.bz2 | |
tree-optimization/121753 - ICE with pattern breaking reduction constraints
The recent change to vect_synth_mult_by_constant missed to handle
the synth_shift_p case for alg_shift, so we still changed c * 4
to c + c + c + c. The following also amends alg_add_t2_m, alg_sub_t2_m,
alg_add_factor and alg_sub_factor appropriately.
PR tree-optimization/121753
* tree-vect-patterns.cc (vect_synth_mult_by_constant): Properly
bail when synth_shift_p and an alg_shift use. Handle other
problematic cases.
| -rw-r--r-- | gcc/tree-vect-patterns.cc | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/tree-vect-patterns.cc b/gcc/tree-vect-patterns.cc index 64a49cc..d0bf2f9 100644 --- a/gcc/tree-vect-patterns.cc +++ b/gcc/tree-vect-patterns.cc @@ -4329,7 +4329,14 @@ vect_synth_mult_by_constant (vec_info *vinfo, tree op, tree val, case alg_add_t2_m: case alg_sub_t2_m: op_uses++; + /* Fallthru. */ + case alg_shift: + if (synth_shift_p && alg.log[i]) + return NULL; break; + case alg_add_factor: + case alg_sub_factor: + return NULL; default: break; } |