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| author | Xin Tong <trent.xin.tong@gmail.com> | 2018-10-08 15:12:48 +0000 |
|---|---|---|
| committer | Xin Tong <trent.xin.tong@gmail.com> | 2018-10-08 15:12:48 +0000 |
| commit | bfdad33b82b9ac535b33b2783870dffe3bd401f3 (patch) | |
| tree | 4b10dbc758b6d57656d06b6656ac8d3c3a792ffc /llvm/utils/TableGen/CodeGenDAGPatterns.cpp | |
| parent | 367b4741f4954c9d4013ffcbfb48ca2c535fd6d1 (diff) | |
| download | llvm-bfdad33b82b9ac535b33b2783870dffe3bd401f3.zip llvm-bfdad33b82b9ac535b33b2783870dffe3bd401f3.tar.gz llvm-bfdad33b82b9ac535b33b2783870dffe3bd401f3.tar.bz2 | |
[ThinLTO] Keep non-prevailing (linkonce|weak)_odr symbols live
Summary:
If we have a symbol with (linkonce|weak)_odr linkage, we do not want
to dead strip it even it is not prevailing.
IR level (linkonce|weak)_odr symbol can become non-prevailing when we mix
ELF objects and IR objects where the (linkonce|weak)_odr symbol in the ELF
object is prevailing and the ones in the IR objects are not. Stripping
them will prevent us from doing optimizations with them.
By not dead stripping them, We will convert these symbols to
available_externally linkage as a result of non-prevailing and eventually
dropping them after inlining.
I modified cache-prevailing.ll to use linkonce linkage as it is
testing whether cache prevailing bit is effective or not, not
we should treat linkonce_odr alive or not
Reviewers: tejohnson, pcc
Subscribers: mehdi_amini, inglorion, eraman, steven_wu, dexonsmith, llvm-commits
Differential Revision: https://reviews.llvm.org/D52893
llvm-svn: 343970
Diffstat (limited to 'llvm/utils/TableGen/CodeGenDAGPatterns.cpp')
0 files changed, 0 insertions, 0 deletions