Thomas Symalla fd64a857ee [AMDGPU] Combine s_or_saveexec, s_xor instructions. ...

This patch merges a consecutive sequence of

s_or_saveexec s_o, s_i
s_xor exec, exec, s_o

into a single

s_andn2_saveexec s_o, s_i instruction.
This patch also cleans up the SIOptimizeExecMasking pass a bit.

Reviewed By: nhaehnle

Differential Revision: https://reviews.llvm.org/D129073

2022-07-21 14:16:37 +02:00

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