* [Bug default/27466] New: [dwz] Improve heuristics for odr
@ 2021-02-25 14:10 vries at gcc dot gnu.org
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From: vries at gcc dot gnu.org @ 2021-02-25 14:10 UTC (permalink / raw)
Bug ID: 27466
Summary: [dwz] Improve heuristics for odr
Assignee: nobody at sourceware dot org
Reporter: vries at gcc dot gnu.org
CC: dwz at sourceware dot org
Target Milestone: ---
In partition_dups_1, we use heuristics to decide whether to convert a partition
into a partial unit.
These heuristics use the number of unique referrer CUs, registered in the cnt
This cnt is used to compute both:
- the current size of the partition:
"orig_size = size * cnt;"
- to size of imports of partial unit to be created:
"+ (part_lang != 0 ? 0 : import_size * cnt)".
With odr, the duplicate chain is no longer isomorph, and consequently orig_size
cannot any longer be calculated using size * cnt.
Then, the number of unique referrer CUs is the correct number to use for the
number of imports. But due to recent commit "Fix DW_AT_decl_file for odr
", the cnt variable may be lower than the actual number of unique referrer CUs.
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