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c3aa937b25
loops. We do this by reconstructing the newly added loops after the unroll completes to avoid threading pass manager details through all the mess of the unrolling infrastructure. I've enabled some extra assertions in the LPM to try and catch issues here and enabled a bunch of unroller tests to try and make sure this is sane. Currently, I'm manually running loop-simplify when needed. That should go away once it is folded into the LPM infrastructure. Differential Revision: https://reviews.llvm.org/D28848 llvm-svn: 293011
47 lines
2.3 KiB
LLVM
47 lines
2.3 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt < %s -disable-output -stats -loop-unroll -unroll-runtime -unroll-threshold=400 -info-output-file - | FileCheck %s --check-prefix=STATS
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; RUN: opt < %s -disable-output -stats -passes='require<opt-remark-emit>,loop(unroll)' -unroll-runtime -unroll-threshold=400 -info-output-file - | FileCheck %s --check-prefix=STATS
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; Test that nested loops can be unrolled. We need to increase threshold to do it
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; STATS: 2 loop-unroll - Number of loops unrolled (completely or otherwise)
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define i32 @nested(i32* nocapture %a, i32 %n, i32 %m) nounwind uwtable readonly {
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entry:
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%cmp11 = icmp sgt i32 %n, 0
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br i1 %cmp11, label %for.cond1.preheader.lr.ph, label %for.end7
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for.cond1.preheader.lr.ph: ; preds = %entry
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%cmp28 = icmp sgt i32 %m, 0
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br label %for.cond1.preheader
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for.cond1.preheader: ; preds = %for.inc5, %for.cond1.preheader.lr.ph
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%indvars.iv16 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next17, %for.inc5 ]
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%sum.012 = phi i32 [ 0, %for.cond1.preheader.lr.ph ], [ %sum.1.lcssa, %for.inc5 ]
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br i1 %cmp28, label %for.body3, label %for.inc5
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for.body3: ; preds = %for.cond1.preheader, %for.body3
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body3 ], [ 0, %for.cond1.preheader ]
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%sum.19 = phi i32 [ %add4, %for.body3 ], [ %sum.012, %for.cond1.preheader ]
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%0 = add nsw i64 %indvars.iv, %indvars.iv16
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %0
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%1 = load i32, i32* %arrayidx, align 4
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%add4 = add nsw i32 %1, %sum.19
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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, %m
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br i1 %exitcond, label %for.inc5, label %for.body3
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for.inc5: ; preds = %for.body3, %for.cond1.preheader
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%sum.1.lcssa = phi i32 [ %sum.012, %for.cond1.preheader ], [ %add4, %for.body3 ]
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%indvars.iv.next17 = add i64 %indvars.iv16, 1
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%lftr.wideiv18 = trunc i64 %indvars.iv.next17 to i32
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%exitcond19 = icmp eq i32 %lftr.wideiv18, %n
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br i1 %exitcond19, label %for.end7, label %for.cond1.preheader
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for.end7: ; preds = %for.inc5, %entry
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%sum.0.lcssa = phi i32 [ 0, %entry ], [ %sum.1.lcssa, %for.inc5 ]
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ret i32 %sum.0.lcssa
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}
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