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This repository was archived by the owner on Apr 23, 2020. It is now read-only.
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r332342 | whitequark | 2018-05-15 04:31:07 -0700 (Tue, 15 May 2018) | 23 lines
[MergeFunctions] Fix merging of small weak functions
When two interposable functions are merged, we cannot replace
uses and have to emit calls to a common internal function. However,
writeThunk() will not actually emit a thunk if the function is too
small. This leaves us in a broken state where mergeTwoFunctions
already rewired the functions, but writeThunk doesn't do anything.
This patch changes the implementation so that:
* writeThunk() does just that.
* The direct replacement of calls is moved into mergeTwoFunctions()
into the non-interposable case only.
* isThunkProfitable() is extracted and will be called for
the non-iterposable case always, and in the interposable case
only if uses are still left after replacement.
This issue has been introduced in https://reviews.llvm.org/D34806,
where the code for checking thunk profitability has been moved.
Differential Revision: https://reviews.llvm.org/D46804
Reviewed By: whitequark
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@332662 91177308-0d34-0410-b5e6-96231b3b80d8
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