Nemanja Ivanovic b0783cccb7 [PowerPC] Follow-up to r318436 to get the missed CSE opportunities ...

The last of the three patches that https://reviews.llvm.org/D40348 was
broken up into.
Canonicalize the materialization of constants so that they are more likely
to be CSE'd regardless of the bit-width of the use. If a constant can be
materialized using PPC::LI, materialize it the same way always.
For example:
  li 4, -1
  li 4, 255
  li 4, 65535
are equivalent if the uses only use the low byte. Canonicalize it to the
first form.

Differential Revision: https://reviews.llvm.org/D40348

llvm-svn: 320473

2017-12-12 12:09:34 +00:00

3.2 KiB

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