We added a new post-isel CTRLoop pass in D122125. That pass will expand
the hardware loop related intrinsic to CTR loop or normal loop based
on the loop context. So we don't need to conservatively check the CTR
clobber now on the IR level.
Reviewed By: lkail
Differential Revision: https://reviews.llvm.org/D135847
mflr is kind of expensive on Power version smaller than 10, so we should
schedule the store for the mflr's def away from mflr.
In epilogue, the expensive mtlr has no user for its def, so it doesn't
matter that the load and the mtlr are back-to-back.
Reviewed By: RolandF
Differential Revision: https://reviews.llvm.org/D137423
SPE doesn't have a fmadd instruction, so don't bother hoisting a
multiply and add sequence to this, as it'd become just a library call.
Hoisting happens too late for the CTR usability test to veto using the
CTR in a loop, and results in an assert "Invalid PPC CTR loop!".
This fixes bug 55463, similar to D78668. This is a temporary fix since
we will switch to post-isel CTR loop determination in the future.
Reviewed By: dim, shchenz
Differential Revision: https://reviews.llvm.org/D125746
