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99dd11f7e8
Summary: This is largely NFC*, in preparation for utilizing ProfileSummaryInfo and BranchFrequencyInfo analyses. In this patch I am only doing the splitting for the New PM, but I can do the same for the legacy PM as a follow-on if this looks good. *Not NFC since for partial unrolling we lose the updates done to the loop traversal (adding new sibling and child loops) - according to Chandler this is not very useful for partial unrolling, but it also means that the debugging flag -unroll-revisit-child-loops no longer works for partial unrolling. Reviewers: chandlerc Subscribers: mehdi_amini, mzolotukhin, eraman, llvm-commits Differential Revision: https://reviews.llvm.org/D36157 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309886 91177308-0d34-0410-b5e6-96231b3b80d8
40 lines
2.1 KiB
LLVM
40 lines
2.1 KiB
LLVM
; RUN: opt < %s -S -loop-unroll -unroll-threshold=25 -unroll-partial-threshold=25 -unroll-runtime -unroll-runtime-epilog=true -unroll-count=8 | FileCheck %s -check-prefix=EPILOG
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; RUN: opt < %s -S -loop-unroll -unroll-threshold=25 -unroll-partial-threshold=25 -unroll-runtime -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
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; RUN: opt < %s -S -passes='require<opt-remark-emit>,unroll' -unroll-threshold=25 -unroll-partial-threshold=25 -unroll-runtime -unroll-runtime-epilog=true -unroll-count=8 | FileCheck %s -check-prefix=EPILOG
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; RUN: opt < %s -S -passes='require<opt-remark-emit>,unroll' -unroll-threshold=25 -unroll-partial-threshold=25 -unroll-runtime -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
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; Choose a smaller, power-of-two, unroll count if the loop is too large.
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; This test makes sure we're not unrolling 'odd' counts
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; EPILOG: for.body:
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; EPILOG: br i1 %niter.ncmp.3, label %for.end.loopexit.unr-lcssa.loopexit{{.*}}, label %for.body
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; EPILOG-NOT: br i1 %niter.ncmp.4, label %for.end.loopexit.unr-lcssa.loopexit{{.*}}, label %for.body
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; EPILOG: for.body.epil:
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; PROLOG: for.body.prol:
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; PROLOG: for.body:
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; PROLOG: br i1 %exitcond.3, label %for.end.loopexit{{.*}}, label %for.body
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; PROLOG-NOT: br i1 %exitcond.4, label %for.end.loopexit{{.*}}, label %for.body
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define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly {
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entry:
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%cmp1 = icmp eq i32 %n, 0
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br i1 %cmp1, label %for.end, label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
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%sum.02 = phi i32 [ %add, %for.body ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%add = add nsw i32 %0, %sum.02
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body, %entry
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%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
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ret i32 %sum.0.lcssa
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}
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