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| author | Jakub Jelinek <jakub@redhat.com> | 2022-03-30 10:21:16 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2022-03-30 10:21:16 +0200 |
| commit | 387e818cda0ffde86f624228c3da1ab28f453685 (patch) | |
| tree | 8df9a9b6da26884063bede81345849558b8c9633 /gcc/gcov-io.cc | |
| parent | 410f39f56c14b195f066b9a18a3c6e8ffa03f848 (diff) | |
| download | gcc-387e818cda0ffde86f624228c3da1ab28f453685.zip gcc-387e818cda0ffde86f624228c3da1ab28f453685.tar.gz gcc-387e818cda0ffde86f624228c3da1ab28f453685.tar.bz2 | |
store-merging: Avoid ICEs on roughly ~0ULL/8 sized stores [PR105094]
On the following testcase on 64-bit targets, store-merging sees
a MEM_REF store from {} ctor with "negative" bitsize where bitoff + bitsize
wraps around to very small end offset. This later confuses the code
so that it allocates just a few bytes of memory but fills in huge amounts of
it. Later on there is a param_store_merging_max_size size check but due to
the wrap-around we pass that.
The following patch punts on such large bitsizes.
2022-03-30 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/105094
* gimple-ssa-store-merging.cc (mem_valid_for_store_merging): Punt if
bitsize <= 0 rather than just == 0.
* gcc.dg/pr105094.c: New test.
Diffstat (limited to 'gcc/gcov-io.cc')
0 files changed, 0 insertions, 0 deletions