Rational: if there is indirect access that is usually an issue
because load is not ready by the use. However, if use is inside a
loop and load is outside that is potentially an issue for a first
iteration only.
Differential Revision: https://reviews.llvm.org/D47740
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334420 91177308-0d34-0410-b5e6-96231b3b80d8
This is adoption of HSAIL perfhint pass. Two types of hints are produced:
1. Function is memory bound.
2. Kernel can use wave limiter.
Currently these hints are used in the scheduler. If a function is suspected
to be memory bound we allow occupancy to decrease to 4 waves in the course
of scheduling.
Differential Revision: https://reviews.llvm.org/D46992
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333289 91177308-0d34-0410-b5e6-96231b3b80d8
