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1046030
2015 Apr 27
4
[LLVMdev] alias set collapse and LICM
I'm current facing an issue related to AliasSetTracker/LICM: the
transitive closure of the alias sets is materially more conservative
than individual aliasing queries and this conservatism leads to
generally worse optimization in LICM.
For instance, consider this module:
declare i32 @only_reads() readonly
declare void @escape(i32*, i32*, i32*)
define void @f(i32 %count) {
entry:
%a =