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[AMDGPU] Fix DPP sequence in atomic optimizer.

Description

[AMDGPU] Fix DPP sequence in atomic optimizer.

This commit fixes the DPP sequence in the atomic optimizer (which was
previously missing the row_shr:3 step), and works around a read_register
exec bug by using a ballot instead.

Differential Revision: https://reviews.llvm.org/D57737

Details

Committed
sheredomMon, Feb 11, 6:44 AM
Differential Revision
D57737: [AMDGPU] Fix DPP sequence in atomic optimizer.
Parents
rL353702: Breakpad: auto-detect path style of file entries
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