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clang-p2996/clang/test/CodeGen/thinlto-distributed-newpm.ll
Arthur Eubanks 19867de9e7 [NewPM] Only invalidate modified functions' analyses in CGSCC passes + turn on eagerly invalidate analyses 
Previously, any change in any function in an SCC would cause all
analyses for all functions in the SCC to be invalidated. With this
change, we now manually invalidate analyses for functions we modify,
then let the pass manager know that all function analyses should be
preserved since we've already handled function analysis invalidation.

So far this only touches the inliner, argpromotion, function-attrs, and
updateCGAndAnalysisManager(), since they are the most used.

This is part of an effort to investigate running the function
simplification pipeline less on functions we visit multiple times in the
inliner pipeline.

However, this causes major memory regressions especially on larger IR.
To counteract this, turn on the option to eagerly invalidate function
analyses. This invalidates analyses on functions immediately after
they're processed in a module or scc to function adaptor for specific
parts of the pipeline.

Within an SCC, if a pass only modifies one function, other functions in
the SCC do not have their analyses invalidated, so in later function
passes in the SCC pass manager the analyses may still be cached. It is
only after the function passes that the eager invalidation takes effect.
For the default pipelines this makes sense because the inliner pipeline
runs the function simplification pipeline after all other SCC passes
(except CoroSplit which doesn't request any analyses).

Overall this has mostly positive effects on compile time and positive effects on memory usage.
https://llvm-compile-time-tracker.com/compare.php?from=7f627596977624730f9298a1b69883af1555765e&to=39e824e0d3ca8a517502f13032dfa67304841c90&stat=instructions
https://llvm-compile-time-tracker.com/compare.php?from=7f627596977624730f9298a1b69883af1555765e&to=39e824e0d3ca8a517502f13032dfa67304841c90&stat=max-rss

D113196 shows that we slightly regressed compile times in exchange for
some memory improvements when turning on eager invalidation.  D100917
shows that we slightly improved compile times in exchange for major
memory regressions in some cases when invalidating less in SCC passes.
Turning these on at the same time keeps the memory improvements while
keeping compile times neutral/slightly positive.

Reviewed By: asbirlea, nikic

Differential Revision: https://reviews.llvm.org/D113304
2021-11-15 14:44:53 -08:00

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; FIXME: This test should use CHECK-NEXT to keep up-to-date.
; REQUIRES: x86-registered-target
; Validate ThinLTO post link pipeline at O2 and O3
; RUN: opt -thinlto-bc -o %t.o %s
; RUN: llvm-lto2 run -thinlto-distributed-indexes %t.o \
; RUN: -o %t2.index \
; RUN: -r=%t.o,main,px
; RUN: %clang -target x86_64-grtev4-linux-gnu \
; RUN: -O2 -fexperimental-new-pass-manager -Xclang -fdebug-pass-manager \
; RUN: -c -fthinlto-index=%t.o.thinlto.bc \
; RUN: -o %t.native.o -x ir %t.o 2>&1 | FileCheck -check-prefix=CHECK-O %s --dump-input=fail
; RUN: %clang -target x86_64-grtev4-linux-gnu \
; RUN: -O3 -fexperimental-new-pass-manager -Xclang -fdebug-pass-manager \
; RUN: -c -fthinlto-index=%t.o.thinlto.bc \
; RUN: -o %t.native.o -x ir %t.o 2>&1 | FileCheck -check-prefixes=CHECK-O,CHECK-O3 %s --dump-input=fail
; CHECK-O: Running pass: WholeProgramDevirtPass
; CHECK-O: Running pass: LowerTypeTestsPass
; CHECK-O: Running pass: ForceFunctionAttrsPass
; CHECK-O: Running pass: PGOIndirectCallPromotion
; CHECK-O: Running pass: InferFunctionAttrsPass
; CHECK-O: Running pass: LowerExpectIntrinsicPass on main
; CHECK-O: Running pass: SimplifyCFGPass on main
; CHECK-O: Running pass: SROAPass on main
; CHECK-O: Running pass: EarlyCSEPass on main
; CHECK-O3: Running pass: CallSiteSplittingPass on main
; CHECK-O: Running pass: LowerTypeTestsPass
; CHECK-O: Running pass: IPSCCPPass
; CHECK-O: Running pass: CalledValuePropagationPass
; CHECK-O: Running pass: GlobalOptPass
; CHECK-O: Running pass: PromotePass
; CHECK-O: Running pass: DeadArgumentEliminationPass
; CHECK-O: Running pass: InstCombinePass on main
; CHECK-O: Running pass: SimplifyCFGPass on main
; CHECK-O: Running pass: InlinerPass on (main)
; CHECK-O: Running pass: PostOrderFunctionAttrsPass on (main)
; CHECK-O3: Running pass: ArgumentPromotionPass on (main)
; CHECK-O: Running pass: SROAPass on main
; CHECK-O: Running pass: EarlyCSEPass on main
; CHECK-O: Running pass: SpeculativeExecutionPass on main
; CHECK-O: Running pass: JumpThreadingPass on main
; CHECK-O: Running pass: CorrelatedValuePropagationPass on main
; CHECK-O: Running pass: SimplifyCFGPass on main
; CHECK-O3: Running pass: AggressiveInstCombinePass on main
; CHECK-O: Running pass: InstCombinePass on main
; CHECK-O: Running pass: LibCallsShrinkWrapPass on main
; CHECK-O: Running pass: TailCallElimPass on main
; CHECK-O: Running pass: SimplifyCFGPass on main
; CHECK-O: Running pass: ReassociatePass on main
; CHECK-O: Running pass: RequireAnalysisPass<{{.*}}OptimizationRemarkEmitterAnalysis
; CHECK-O: Running pass: LoopSimplifyPass on main
; CHECK-O: Running pass: LCSSAPass on main
; CHECK-O: Running pass: SimplifyCFGPass on main
; CHECK-O: Running pass: InstCombinePass on main
; CHECK-O: Running pass: LoopSimplifyPass on main
; CHECK-O: Running pass: LCSSAPass on main
; CHECK-O: Running pass: SROAPass on main
; CHECK-O: Running pass: MergedLoadStoreMotionPass on main
; CHECK-O: Running pass: GVNPass on main
; CHECK-O: Running pass: SCCPPass on main
; CHECK-O: Running pass: BDCEPass on main
; CHECK-O: Running pass: InstCombinePass on main
; CHECK-O: Running pass: JumpThreadingPass on main
; CHECK-O: Running pass: CorrelatedValuePropagationPass on main
; CHECK-O: Running pass: ADCEPass on main
; CHECK-O: Running pass: MemCpyOptPass on main
; CHECK-O: Running pass: DSEPass on main
; CHECK-O: Running pass: LoopSimplifyPass on main
; CHECK-O: Running pass: LCSSAPass on main
; CHECK-O: Running pass: SimplifyCFGPass on main
; CHECK-O: Running pass: InstCombinePass on main
; CHECK-O: Running pass: GlobalOptPass
; CHECK-O: Running pass: GlobalDCEPass
; CHECK-O: Running pass: EliminateAvailableExternallyPass
; CHECK-O: Running pass: ReversePostOrderFunctionAttrsPass
; CHECK-O: Running pass: RequireAnalysisPass<{{.*}}GlobalsAA
; CHECK-O: Running pass: Float2IntPass on main
; CHECK-O: Running pass: LowerConstantIntrinsicsPass on main
; CHECK-O: Running pass: LoopSimplifyPass on main
; CHECK-O: Running pass: LCSSAPass on main
; CHECK-O: Running pass: LoopRotatePass on Loop at depth 1 containing: %b
; CHECK-O: Running pass: LoopDistributePass on main
; CHECK-O: Running pass: InjectTLIMappings on main
; CHECK-O: Running pass: LoopVectorizePass on main
; CHECK-O: Running pass: LoopLoadEliminationPass on main
; CHECK-O: Running pass: InstCombinePass on main
; CHECK-O: Running pass: SimplifyCFGPass on main
; CHECK-O: Running pass: SLPVectorizerPass on main
; CHECK-O: Running pass: VectorCombinePass on main
; CHECK-O: Running pass: InstCombinePass on main
; CHECK-O: Running pass: LoopUnrollPass on main
; CHECK-O: Running pass: WarnMissedTransformationsPass on main
; CHECK-O: Running pass: InstCombinePass on main
; CHECK-O: Running pass: RequireAnalysisPass<{{.*}}OptimizationRemarkEmitterAnalysis
; CHECK-O: Running pass: LoopSimplifyPass on main
; CHECK-O: Running pass: LCSSAPass on main
; CHECK-O: Running pass: LICMPass on Loop at depth 1 containing: %b
; CHECK-O: Running pass: AlignmentFromAssumptionsPass on main
; CHECK-O: Running pass: LoopSinkPass on main
; CHECK-O: Running pass: InstSimplifyPass on main
; CHECK-O: Running pass: DivRemPairsPass on main
; CHECK-O: Running pass: SimplifyCFGPass on main
; CHECK-O: Running pass: CGProfilePass
; CHECK-O: Running pass: GlobalDCEPass
; CHECK-O: Running pass: ConstantMergePass
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-grtev4-linux-gnu"
define i32 @main() {
br label %b
b:
br label %b
ret i32 0
}
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