[llvm-dev] Flags -O2 -O3

[David Fernandez Lobon via llvm-dev]

Hello LLVM Developers:

I used  this command , *llvm-as < /dev/null | opt -O3 -disable-output 
-debug-pass=Arguments*,

to take differents transformations of LLVM. I need to know if the order 
of this transformations how appear in the output of the command is the 
order to apply the differences flags to opt or what is the meaning?:

Pass Arguments:  -tti -tbaa -scoped-noalias -assumption-cache-tracker 
-targetlibinfo -verify -ee-instrument -simplifycfg -domtree -sroa 
-early-cse -lower-expect
Pass Arguments:  -targetlibinfo -tti -tbaa -scoped-noalias 
-assumption-cache-tracker -profile-summary-info -forceattrs -inferattrs 
-domtree -callsite-splitting -ipsccp -called-value-propagation 
-globalopt -domtree -mem2reg -deadargelim -domtree -basicaa -aa -loops 
-lazy-branch-prob -lazy-block-freq -opt-remark-emitter -instcombine 
-simplifycfg -basiccg -globals-aa -prune-eh -inline -functionattrs 
-argpromotion -domtree -sroa -basicaa -aa -memoryssa -early-cse-memssa 
-speculative-execution -basicaa -aa -lazy-value-info -jump-threading 
-correlated-propagation -simplifycfg -domtree -aggressive-instcombine 
-basicaa -aa -loops -lazy-branch-prob -lazy-block-freq 
-opt-remark-emitter -instcombine -libcalls-shrinkwrap -loops 
-branch-prob -block-freq -lazy-branch-prob -lazy-block-freq 
-opt-remark-emitter -pgo-memop-opt -basicaa -aa -loops -lazy-branch-prob 
-lazy-block-freq -opt-remark-emitter -tailcallelim -simplifycfg 
-reassociate -domtree -loops -loop-simplify -lcssa-verification -lcssa 
-basicaa -aa -scalar-evolution -loop-rotate -licm -loop-unswitch 
-simplifycfg -domtree -basicaa -aa -loops -lazy-branch-prob 
-lazy-block-freq -opt-remark-emitter -instcombine -loop-simplify 
-lcssa-verification -lcssa -scalar-evolution -indvars -loop-idiom 
-loop-deletion -loop-unroll -mldst-motion -phi-values -basicaa -aa 
-memdep -lazy-branch-prob -lazy-block-freq -opt-remark-emitter -gvn 
-phi-values -basicaa -aa -memdep -memcpyopt -sccp -demanded-bits -bdce 
-basicaa -aa -loops -lazy-branch-prob -lazy-block-freq 
-opt-remark-emitter -instcombine -lazy-value-info -jump-threading 
-correlated-propagation -basicaa -aa -phi-values -memdep -dse -loops 
-loop-simplify -lcssa-verification -lcssa -basicaa -aa -scalar-evolution 
-licm -postdomtree -adce -simplifycfg -domtree -basicaa -aa -loops 
-lazy-branch-prob -lazy-block-freq -opt-remark-emitter -instcombine 
-barrier -elim-avail-extern -basiccg -rpo-functionattrs -globalopt 
-globaldce -basiccg -globals-aa -float2int -domtree -loops 
-loop-simplify -lcssa-verification -lcssa -basicaa -aa -scalar-evolution 
-loop-rotate -loop-accesses -lazy-branch-prob -lazy-block-freq 
-opt-remark-emitter -loop-distribute -branch-prob -block-freq 
-scalar-evolution -basicaa -aa -loop-accesses -demanded-bits 
-lazy-branch-prob -lazy-block-freq -opt-remark-emitter -loop-vectorize 
-loop-simplify -scalar-evolution -aa -loop-accesses -loop-load-elim 
-basicaa -aa -lazy-branch-prob -lazy-block-freq -opt-remark-emitter 
-instcombine -simplifycfg -domtree -loops -scalar-evolution -basicaa -aa 
-demanded-bits -lazy-branch-prob -lazy-block-freq -opt-remark-emitter 
-slp-vectorizer -opt-remark-emitter -instcombine -loop-simplify 
-lcssa-verification -lcssa -scalar-evolution -loop-unroll 
-lazy-branch-prob -lazy-block-freq -opt-remark-emitter -instcombine 
-loop-simplify -lcssa-verification -lcssa -scalar-evolution -licm 
-lazy-branch-prob -lazy-block-freq -opt-remark-emitter 
-transform-warning -alignment-from-assumptions -strip-dead-prototypes 
-globaldce -constmerge -domtree -loops -branch-prob -block-freq 
-loop-simplify -lcssa-verification -lcssa -basicaa -aa -scalar-evolution 
-branch-prob -block-freq -loop-sink -lazy-branch-prob -lazy-block-freq 
-opt-remark-emitter -instsimplify -div-rem-pairs -simplifycfg -verify
Pass Arguments:  -domtree
Pass Arguments:  -targetlibinfo -domtree -loops -branch-prob -block-freq
Pass Arguments:  -targetlibinfo -domtree -loops -branch-prob -block-freq

And also I would to know the meaning of the differences  appears of  
Pass Arguments, it is a differences invokes of opt command ?

Thanks for your attention.



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