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The current function importer will walk the callgraph, importing transitively any callee that is below the threshold. This can lead to import very deep which is costly in compile time and not necessarily beneficial as most of the inline would happen in imported function and not necessarilly in user code. The actual factor has been carefully chosen by flipping a coin ;) Some tuning need to be done (just at the existing limiting threshold). Reviewers: tejohnson Differential Revision: http://reviews.llvm.org/D17082 From: Mehdi Amini <mehdi.amini@apple.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260466 91177308-0d34-0410-b5e6-96231b3b80d8
32 lines
1.2 KiB
LLVM
32 lines
1.2 KiB
LLVM
; Do setup work for all below tests: generate bitcode and combined index
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; RUN: llvm-as -function-summary %s -o %t.bc
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; RUN: llvm-as -function-summary %p/Inputs/adjustable_threshold.ll -o %t2.bc
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; RUN: llvm-lto -thinlto -o %t3 %t.bc %t2.bc
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; Test import with default progressive instruction factor
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; RUN: opt -function-import -summary-file %t3.thinlto.bc %s -import-instr-limit=10 -S | FileCheck %s --check-prefix=CHECK --check-prefix=INSTLIM-DEFAULT
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; INSTLIM-DEFAULT: call void @staticfunc2.llvm.2()
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; Test import with a reduced progressive instruction factor
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; RUN: opt -function-import -summary-file %t3.thinlto.bc %s -import-instr-limit=10 -import-instr-evolution-factor=0.5 -S | FileCheck %s --check-prefix=CHECK --check-prefix=INSTLIM-PROGRESSIVE
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; INSTLIM-PROGRESSIVE-NOT: call void @staticfunc
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declare void @globalfunc1()
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declare void @globalfunc2()
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define void @entry() {
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entry:
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; Call site are processed in reversed order!
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; On the direct call, we reconsider @largefunction with a higher threshold and
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; import it
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call void @globalfunc2()
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; When importing globalfunc1, the threshold was limited and @largefunction was
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; not imported.
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call void @globalfunc1()
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ret void
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}
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