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author | Matt Arsenault <Matthew.Arsenault@amd.com> | 2015-10-13 00:49:00 +0000 |
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committer | Matt Arsenault <Matthew.Arsenault@amd.com> | 2015-10-13 00:49:00 +0000 |
commit | e5d9515fb71bc6655cfbb2ef8ce000891aade2b1 (patch) | |
tree | 0f228b41be9d0befd1c06c13586e10a7ecb553d0 /lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.h | |
parent | e69bdd10ead6347dfe42593247dec9a07687389d (diff) | |
download | bcm5719-llvm-e5d9515fb71bc6655cfbb2ef8ce000891aade2b1.tar.gz bcm5719-llvm-e5d9515fb71bc6655cfbb2ef8ce000891aade2b1.zip |
DAGCombiner: Don't stop finding better chain on 2 aliases
The comment says this was stopped because it was unlikely to be
profitable. This is not true if you want to combine vector loads
with multiple components.
For a simple case that looks like
t0 = load t0 ...
t1 = load t0 ...
t2 = load t0 ...
t3 = load t0 ...
t4 = store t0:1, t0:1
t5 = store t4, t1:0
t6 = store t5, t2:0
t7 = store t6, t3:0
We want to get all of these stores onto a chain
that is a TokenFactor of these N loads. This mostly
solves the AMDGPU merge-stores.ll regressions
with -combiner-alias-analysis for merging vector
stores of vector loads.
llvm-svn: 250138
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.h')
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