[LLVMdev] loop multiversioning

[Das, Dibyendu]

Copying Ashutosh who is preparing an LICM patch to expose some of its functionalities with the aim of using them in multiversioned loops. We can work together on this. Our main aim is to enable licm(specifically array scalarization) when may-alias in loops stops such xforms.

Sent from my Windows Phone
________________________________
From: Xin Tong<mailto:trent.tong at gmail.com>
Sent: ‎1/‎18/‎2015 2:40 AM
To: llvmdev at cs.uiuc.edu<mailto:llvmdev at cs.uiuc.edu>
Subject: [LLVMdev] loop multiversioning

Does LLVM have loop multiversioning ? it seems it does not with clang++ -O3 -mllvm -debug-pass=Arguments program.c -c

bash-4.1$ clang++ -O3 -mllvm -debug-pass=Arguments  fast_algorithms.c  -c
clang-3.6: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated
Pass Arguments:  -datalayout -notti -basictti -x86tti -targetlibinfo -no-aa -tbaa -scoped-noalias -assumption-tracker -basicaa -verify -add-discriminators -simplifycfg -domtree -sroa -early-cse -lower-expect
Pass Arguments:  -datalayout -notti -basictti -x86tti -targetlibinfo -no-aa -tbaa -scoped-noalias -assumption-tracker -basicaa -verify-di -ipsccp -globalopt -deadargelim -domtree -instcombine -simplifycfg -basiccg -prune-eh -inline-cost -inline -functionattrs -argpromotion -sroa -domtree -early-cse -lazy-value-info -jump-threading -correlated-propagation -simplifycfg -domtree -instcombine -tailcallelim -simplifycfg -reassociate -domtree -loops -loop-simplify -lcssa -loop-rotate -licm -loop-unswitch -instcombine -scalar-evolution -loop-simplify -lcssa -indvars -loop-idiom -loop-deletion -function_tti -loop-unroll -memdep -mldst-motion -domtree -memdep -gvn -memdep -memcpyopt -sccp -domtree -instcombine -lazy-value-info -jump-threading -correlated-propagation -domtree -memdep -dse -adce -simplifycfg -domtree -instcombine -barrier -domtree -loops -loop-simplify -lcssa -branch-prob -block-freq -scalar-evolution -loop-vectorize -instcombine -scalar-evolution -slp-vectorizer -simplifycfg -domtree -instcombine -loops -loop-simplify -lcssa -scalar-evolution -function_tti -loop-unroll -alignment-from-assumptions -strip-dead-prototypes -globaldce -constmerge -domtree -loops -loop-simplify -lcssa -licm
Pass Arguments:  -datalayout -notti -basictti -x86tti -targetlibinfo -jump-instr-table-info -targetpassconfig -no-aa -tbaa -scoped-noalias -assumption-tracker -basicaa -collector-metadata -machinemoduleinfo -machine-branch-prob -jump-instr-tables -atomic-expand -verify -verify-di -domtree -loops -loop-simplify -scalar-evolution -iv-users -loop-reduce -gc-lowering -unreachableblockelim -consthoist -partially-inline-libcalls -codegenprepare -rewrite-symbols -verify-di -stack-protector -verify -domtree -loops -branch-prob -machinedomtree -expand-isel-pseudos -tailduplication -opt-phis -machinedomtree -slotindexes -stack-coloring -localstackalloc -dead-mi-elimination -machinedomtree -machine-loops -machine-trace-metrics -early-ifcvt -machinelicm -machine-cse -machinepostdomtree -machine-block-freq -machine-sink -peephole-opts -dead-mi-elimination -processimpdefs -unreachable-mbb-elimination -livevars -machinedomtree -machine-loops -phi-node-elimination -twoaddressinstruction -slotindexes -liveintervals -simple-register-coalescing -misched -machine-block-freq -livedebugvars -livestacks -virtregmap -liveregmatrix -edge-bundles -spill-code-placement -virtregrewriter -stack-slot-coloring -machinelicm -edge-bundles -prologepilog -machine-block-freq -branch-folder -tailduplication -machine-cp -postrapseudos -machinedomtree -machine-loops -post-RA-sched -gc-analysis -machine-block-freq -block-placement2 -stackmap-liveness

Thanks,
Trent


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