tree ab2848bf053d0102fa610eb4d650375b5fc8c026
parent 0b097b1a8a99728cdd62278d7c873fc535ae23b9
author Valery Pykhtin <Valery.Pykhtin@amd.com> 1547041412 +0000
committer Valery Pykhtin <Valery.Pykhtin@amd.com> 1547041412 +0000

[AMDGPU] Fix DPP combiner

Fixed issue with identity values and other cases, f32/f16 identity values to be added later. fma/mac instructions is disabled for now.
Test is fully reworked, added comments. Other fixes:

1. dpp move with uses and old reg initializer should be in the same BB.
2. bound_ctrl:0 is only considered when bank_mask and row_mask are fully enabled (0xF). Othervise the old register value is checked for identity.
3. Added add, subrev, and, or instructions to the old folding function.
4. Kill flag is cleared for the src0 (DPP register) as it may be copied into more than one user.

Differential revision: https://reviews.llvm.org/D55444

llvm-svn: 350721