tree 2b67f291f794efb6962f88a517fa6da7d262a4bf
parent 36229b4631a62dc97d546268f4e4d11c43afcfa1
author Artem Belevich <tra@google.com> 1487717765 +0000
committer Artem Belevich <tra@google.com> 1487717765 +0000

[NVPTX] Unify vectorization of load/stores of aggregate arguments and return values.

Original code only used vector loads/stores for explicit vector arguments.
It could also do more loads/stores than necessary (e.g v5f32 would
touch 8 f32 values). Aggregate types were loaded one element at a time,
even the vectors contained within.

This change attempts to generalize (and simplify) parameter space
loads/stores so that vector loads/stores can be used more broadly.
Functionality of the patch has been verified by compiling thrust
test suite and manually checking the differences between PTX
generated by llvm with and without the patch.

General algorithm:
* ComputePTXValueVTs() flattens input/output argument into a flat list
  of scalars to load/store and returns their types and offsets.
* VectorizePTXValueVTs() uses that data to create vectorization plan
  which returns an array of flags marking boundaries of vectorized
  load/stores. Scalars are represented as 1-element vectors.
* Code that generates loads/stores implements a simple state machine
  that constructs a vector according to the plan.

Differential Revision: https://reviews.llvm.org/D30011

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295784 91177308-0d34-0410-b5e6-96231b3b80d8