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The RegionInfo pass detects single entry single exit regions in a function, where a region is defined as any subgraph that is connected to the remaining graph at only two spots. Furthermore an hierarchical region tree is built. Use it by calling "opt -regions analyze" or "opt -view-regions". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109089 91177308-0d34-0410-b5e6-96231b3b80d8
21 lines
402 B
LLVM
21 lines
402 B
LLVM
; RUN: opt -regions -analyze < %s
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; RUN: opt -regions -stats < %s |& FileCheck -check-prefix=STAT %s
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define void @normal_condition() nounwind {
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0:
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br label %"1"
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1:
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br i1 1, label %"2", label %"3"
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2:
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br label %"2"
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3:
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br label %"4"
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4:
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ret void
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}
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; CHECK-NOT: =>
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; CHECK: [0] 0 => <Function Return>
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; CHECK: [1] 1 => 4
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; STAT: 2 region - The # of regions
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; STAT: 1 region - The # of simple regions
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