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| author | Richard Biener <rguenther@suse.de> | 2025-05-09 08:38:45 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2025-06-06 09:52:55 +0200 |
| commit | 44792a6c4253f9a5b322797ef73b9c347c223545 (patch) | |
| tree | 0d74c270a07d673cf658aec8f4e24fc10826b784 /gcc/tree-ssa-phiopt.cc | |
| parent | ca8032d6177668ca7f2a6a2e612e126a97ba8c53 (diff) | |
| download | gcc-44792a6c4253f9a5b322797ef73b9c347c223545.zip gcc-44792a6c4253f9a5b322797ef73b9c347c223545.tar.gz gcc-44792a6c4253f9a5b322797ef73b9c347c223545.tar.bz2 | |
rtl-optimization/120182 - wrong-code with RTL DSE and constant addresses
RTL DSE forms store groups from unique invariant bases but that is
confused when presented with constant addresses where it assigns
one store group per unique address. That causes it to not consider
0x101:QI to alias 0x100:SI. Constant accesses can really alias
to every object, in practice they appear for I/O and for access
to objects fixed via linker scripts for example. So simply avoid
registering a store group for them.
PR rtl-optimization/120182
* dse.cc (canon_address): Constant addresses have no
separate store group.
* gcc.dg/torture/pr120182.c: New testcase.
(cherry picked from commit b9434c3db900d5d037fdf2f64149b82800ceadf8)
Diffstat (limited to 'gcc/tree-ssa-phiopt.cc')
0 files changed, 0 insertions, 0 deletions