| Issue |
115282
|
| Summary |
[GlobalOpt] Reduction of global aggregate with alignment constraint unnecessarily propagates alignment to some elements
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
brunodf-snps
|
When GlobalOpt performs SRA on a global aggregate with an alignment constraint, it seems to propagate the alignment to _some_ of the elements haphazardly. For example:
```
alignas(32) static int params[8];
```
On a plain 32 bit architecture, the array elements respectively have alignment: 32, 4, 8, 4, 16, 4, 8, 4
GlobalOpt SRA creates individual global variables for the elements with respective alignments: 32, 32, 8, 32, 16, 32, 8, 32
I don't see any benefit to increase the alignments elements 1, 3, 5, 7 from 4 to 32. This is wasteful because the new elements cannot be mapped consecutively in memory anymore.
Godbolt demo: https://godbolt.org/z/WjbPjY9Kh
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