Comment # 2
on bug 71647
from Tom Stellard
Can you bisect this? It's possible that this commit is responsible:
R600/SI: Prefer SALU instructions for bit shift operations
All shift operations will be selected as SALU instructions and then
if necessary lowered to VALU instructions in the SIFixSGPRCopies pass.
This allows us to do more operations on the SALU which will improve
performance and is also required for implementing private memory
using indirect addressing, since the private memory pointers must stay
in the scalar registers.
This patch includes some fixes from Matt Arsenault.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194625
91177308-0d34-0410-b5e6-96231b3b80d8
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