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812c9f7a7a
Summary: Otherwise we might end up with some empty basic blocks or single-entry-single-exit basic blocks. This fixes PR32085 Reviewers: chandlerc, danielcdh Subscribers: mehdi_amini, RKSimon, llvm-commits Differential Revision: https://reviews.llvm.org/D30468 llvm-svn: 301395
100 lines
3.6 KiB
LLVM
100 lines
3.6 KiB
LLVM
; Test the particular pass pipelines have the expected structure. This is
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; particularly important in order to check that the implicit scheduling of the
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; legacy pass manager doesn't introduce unexpected structural changes in the
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; pass pipeline.
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;
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; RUN: opt -disable-output -disable-verify -debug-pass=Structure \
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; RUN: -O2 %s 2>&1 \
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; RUN: | FileCheck %s --check-prefix=CHECK-O2
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;
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; In the first pipeline there should just be a function pass manager, no other
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; pass managers.
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; CHECK-O2: Pass Arguments:
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; CHECK-O2-NOT: Manager
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; CHECK-O2: FunctionPass Manager
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; CHECK-O2-NOT: Manager
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;
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; CHECK-O2: Pass Arguments:
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; CHECK-O2: ModulePass Manager
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; CHECK-O2-NOT: Manager
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; First function pass pipeline just does early opts.
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; CHECK-O2: FunctionPass Manager
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; CHECK-O2-NOT: Manager
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; FIXME: It's a bit odd to do dead arg elim in the middle of early opts...
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; CHECK-O2: Dead Argument Elimination
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; CHECK-O2-NEXT: FunctionPass Manager
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; CHECK-O2-NOT: Manager
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; Very carefully asert the CGSCC pass pipeline as it is fragile and unusually
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; susceptible to phase ordering issues.
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; CHECK-O2: CallGraph Construction
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; CHECK-O2-NEXT: Globals Alias Analysis
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; CHECK-O2-NEXT: Call Graph SCC Pass Manager
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; CHECK-O2-NEXT: Remove unused exception handling info
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; CHECK-O2-NEXT: Function Integration/Inlining
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; CHECK-O2-NEXT: Deduce function attributes
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; Next up is the main function pass pipeline. It shouldn't be split up and
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; should contain the main loop pass pipeline as well.
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; CHECK-O2-NEXT: FunctionPass Manager
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; CHECK-O2-NOT: Manager
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; CHECK-O2: Loop Pass Manager
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; CHECK-O2-NOT: Manager
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; FIXME: We shouldn't be pulling out to simplify-cfg and instcombine and
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; causing new loop pass managers.
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; CHECK-O2: Simplify the CFG
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; CHECK-O2-NOT: Manager
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; CHECK-O2: Combine redundant instructions
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; CHECK-O2-NOT: Manager
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; CHECK-O2: Loop Pass Manager
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; CHECK-O2-NOT: Manager
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; FIXME: It isn't clear that we need yet another loop pass pipeline
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; and run of LICM here.
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; CHECK-O2-NOT: Manager
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; CHECK-O2: Loop Pass Manager
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; CHECK-O2-NEXT: Loop Invariant Code Motion
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; CHECK-O2-NOT: Manager
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; Next we break out of the main Function passes inside the CGSCC pipeline with
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; a barrier pass.
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; CHECK-O2: A No-Op Barrier Pass
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; Reduce the size of the IR ASAP after the inliner.
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; CHECK-O2-NEXT: Eliminate Available Externally
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; Inferring function attribute should be right after the CGSCC pipeline, before
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; any other optimizations/analyses.
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; CHECK-O2-NEXT: CallGraph
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; CHECK-O2-NEXT: Deduce function attributes in RPO
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; CHECK-O2-NOT: Manager
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; Next is the late function pass pipeline.
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; CHECK-O2: FunctionPass Manager
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; CHECK-O2-NOT: Manager
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; We rotate loops prior to vectorization.
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; CHECK-O2: Loop Pass Manager
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; CHECK-O2-NEXT: Rotate Loops
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; CHECK-O2-NOT: Manager
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; CHECK-O2: Loop Vectorization
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; CHECK-O2-NOT: Manager
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; CHECK-O2: SLP Vectorizer
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; CHECK-O2-NOT: Manager
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; After vectorization we do partial unrolling.
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; CHECK-O2: Loop Pass Manager
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; CHECK-O2-NEXT: Unroll loops
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; CHECK-O2-NOT: Manager
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; After vectorization and unrolling we try to do any cleanup of inserted code,
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; including a run of LICM. This shouldn't run in the same loop pass manager as
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; the runtime unrolling though.
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; CHECK-O2: Loop Pass Manager
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; CHECK-O2-NEXT: Loop Invariant Code Motion
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; CHECK-O2: FunctionPass Manager
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; CHECK-O2: Loop Pass Manager
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; CHECK-O2-NEXT: Loop Sink
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; CHECK-O2: Simplify the CFG
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; CHECK-O2-NOT: Manager
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;
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; FIXME: There really shouldn't be another pass manager, especially one that
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; just builds the domtree. It doesn't even run the verifier.
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; CHECK-O2: Pass Arguments:
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; CHECK-O2-NEXT: FunctionPass Manager
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; CHECK-O2-NEXT: Dominator Tree Construction
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define void @foo() {
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ret void
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}
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