https://bugs.llvm.org/show_bug.cgi?id=44804
Bug ID: 44804
Summary: Function merging not enabled at -O2/-Os or higher
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: mik...@digitalcarbide.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
In GCC, `-fipa-icf` is enabled at `-O2` (and higher) and `-Os`.
The equivalent functionality, for functions at least, is `-Xclang
-fmerge-functions`. It is not, however, enabled at any optimization level.
It should be changed to be enabled the same as it is in GCC - at `-O2` or
higher, `-Os`, and `-Oz`.
See: https://godbolt.org/z/2wLv_w for an example of a lack of folding in Clang
as compared to GCC.
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