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archived-llvm/lib/Target/AMDGPU
Stanislav Mekhanoshin ddb10d2e51 [AMDGPU] Optimize SI_IF lowering for simple if regions
Currently SI_IF results in a s_and_saveexec_b64 followed by s_xor_b64.
The xor is used to extract only the changed bits. In case of a simple
if region where the only use of that value is in the SI_END_CF to
restore the old exec mask, we can omit the xor and perform an or of
the exec mask with the original exec value saved by the
s_and_saveexec_b64.

Differential Revision: https://reviews.llvm.org/D35861

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309185 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-26 21:29:15 +00:00
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