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[LICM] Allow AliasSetMap to contain top-level loops.
When an outer loop gets deleted by a different pass, before LICM visits it, we cannot clean up its sub-loops in AliasSetMap, because at the point we receive the deleteAnalysisLoop callback for the outer loop, the loop object is already invalid and we cannot access its sub-loops any longer. Reviewers: asbirlea, sanjoy, chandlerc Reviewed By: asbirlea Differential Revision: https://reviews.llvm.org/D61904 llvm-svn: 360704
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46 changes: 46 additions & 0 deletions
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llvm/test/Transforms/LICM/outer-loop-deleted-before-licm.ll
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; RUN: opt %s -S -loop-unroll -licm | FileCheck %s | ||
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; Check that we can deal with loops where a parent loop gets deleted before it | ||
; is visited by LICM. | ||
define void @test() { | ||
; CHECK-LABEL: define void @test() { | ||
; CHECK-LABEL: entry: | ||
; CHECK-NEXT: br label %for.body43 | ||
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; CHECK-LABEL: for.body43: ; preds = %entry | ||
; CHECK-NEXT: br label %if.else75 | ||
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; CHECK-LABEL: if.else75: ; preds = %for.body43 | ||
; CHECK-NEXT: br label %for.body467 | ||
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; CHECK-LABEL: for.body467: ; preds = %for.body467.for.body467_crit_edge, %if.else75 | ||
; CHECK-NEXT: br label %for.body467.for.body467_crit_edge | ||
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; CHECK-LABEL: for.body467.for.body467_crit_edge: ; preds = %for.body467 | ||
; CHECK-NEXT: br i1 false, label %for.end539, label %for.body467 | ||
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; CHECK-LABEL: for.end539: ; preds = %for.body467.for.body467_crit_edge | ||
; CHECK-NEXT: ret void | ||
; | ||
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entry: | ||
br label %for.body43 | ||
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for.body43: ; preds = %for.end539, %entry | ||
br label %if.else75 | ||
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if.else75: ; preds = %for.body43 | ||
br label %for.body467 | ||
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for.body467: ; preds = %for.body467.for.body467_crit_edge, %if.else75 | ||
br label %for.body467.for.body467_crit_edge | ||
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for.body467.for.body467_crit_edge: ; preds = %for.body467 | ||
br i1 false, label %for.end539, label %for.body467 | ||
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for.end539: ; preds = %for.body467 | ||
br i1 undef, label %for.body43, label %for.end547 | ||
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for.end547: ; preds = %for.body43 | ||
ret void | ||
} |