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| author | Matthias Braun <matze@braunis.de> | 2017-09-06 20:45:24 +0000 |
|---|---|---|
| committer | Matthias Braun <matze@braunis.de> | 2017-09-06 20:45:24 +0000 |
| commit | c9056b834dd7343204228a93ad54b7e8dda70dab (patch) | |
| tree | 4a1d309d43e68ddec515dac260af5b5a60b53ee6 /llvm/lib/Object/WasmObjectFile.cpp | |
| parent | d147f522525ac091a5e3235b2c26c47733fe9ed9 (diff) | |
| download | llvm-c9056b834dd7343204228a93ad54b7e8dda70dab.zip llvm-c9056b834dd7343204228a93ad54b7e8dda70dab.tar.gz llvm-c9056b834dd7343204228a93ad54b7e8dda70dab.tar.bz2 | |
Insert IMPLICIT_DEFS for undef uses in tail merging
Tail merging can convert an undef use into a normal one when creating a
common tail. Doing so can make the register live out from a block which
previously contained the undef use. To keep the liveness up-to-date,
insert IMPLICIT_DEFs in such blocks when necessary.
To enable this patch the computeLiveIns() function which used to
compute live-ins for a block and set them immediately is split into new
functions:
- computeLiveIns() just computes the live-ins in a LivePhysRegs set.
- addLiveIns() applies the live-ins to a block live-in list.
- computeAndAddLiveIns() is a convenience function combining the other
two functions and behaving like computeLiveIns() before this patch.
Based on a patch by Krzysztof Parzyszek <kparzysz@codeaurora.org>
Differential Revision: https://reviews.llvm.org/D37034
llvm-svn: 312668
Diffstat (limited to 'llvm/lib/Object/WasmObjectFile.cpp')
0 files changed, 0 insertions, 0 deletions