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Author SHA1 Message Date
Dmitri Gribenko d9c4060bd5 Revert "[MachineCopyPropagation] Remove redundant copies after TailDup via machine-cp" 
This reverts commit 371359. I'm suspecting a miscompile, I posted a
reproducer to https://reviews.llvm.org/D65267.

llvm-svn: 371421
 2019-09-09 16:46:45 +00:00
Kai Luo 9115c477bb [MachineCopyPropagation] Remove redundant copies after TailDup via machine-cp 
Summary:
After tailduplication, we have redundant copies. We can remove these
copies in machine-cp if it's safe to, i.e.
```
$reg0 = OP ...
... <<< No read or clobber of $reg0 and $reg1
$reg1 = COPY $reg0 <<< $reg0 is killed
...
<RET>
```
will be transformed to
```
$reg1 = OP ...
...
<RET>
```

Differential Revision: https://reviews.llvm.org/D65267

llvm-svn: 371359
 2019-09-09 02:32:42 +00:00
Kai Luo cfd4c33344 [NFC][PowerPC] Added test to track current behaviour of TailDup 
llvm-svn: 365746
 2019-07-11 09:43:03 +00:00