Jay Foad c885857e9d [AMDGPU] Enable load clustering in the post-RA scheduler ...

This has a couple of benefits:
1. It can sometimes fix clusters that got broken apart when the register
   allocator inserted a copy.
2. Post-RA scheduling does not have to worry about increasing register
   pressure, which in some cases gives it more freedom to reorder
   instructions.

Testing on a collection of 10,000 graphics shaders compiled for gfx1010
showed:
- The average length of each run of one or more load instructions
  increased by about 1%.
- The number of runs of two or more load instructions increased by
  about 4%.

Differential Revision: https://reviews.llvm.org/D111646

2021-10-13 17:12:26 +01:00

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