[llvm-bugs] [Bug 44804] New: Function merging not enabled at -O2/-Os or higher

[via llvm-bugs]

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: unassignedclangbugs at nondot.org
          Reporter: mike.k at digitalcarbide.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at 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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