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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
47 lines
1.0 KiB
LLVM
47 lines
1.0 KiB
LLVM
; RUN: opt -regions -analyze < %s | FileCheck %s
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; RUN: opt -regions -stats < %s |& FileCheck -check-prefix=STAT %s
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; RUN: opt -regions -print-region-style=bb -analyze < %s |& FileCheck -check-prefix=BBIT %s
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; RUN: opt -regions -print-region-style=rn -analyze < %s |& FileCheck -check-prefix=RNIT %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 %"6", label %"2"
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2:
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br i1 1, label %"3", label %"4"
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3:
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br label %"5"
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4:
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br label %"5"
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5:
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br label %"8"
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8:
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br i1 1, label %"7", label %"9"
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9:
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br label %"2"
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7:
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br label %"6"
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6:
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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-NEXT: [1] 1 => 6
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; CHECK-NEXT: [2] 2 => 7
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; CHECK-NEXT: [3] 2 => 5
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; STAT: 4 region - The # of regions
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; STAT: 1 region - The # of simple regions
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; BBIT: 0, 1, 6, 2, 3, 5, 8, 7, 9, 4,
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; BBIT: 1, 2, 3, 5, 8, 7, 9, 4,
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; BBIT: 2, 3, 5, 8, 9, 4,
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; BBIT: 2, 3, 4,
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; RNIT: 0, 1 => 6, 6,
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; RNIT: 1, 2 => 7, 7,
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; RNIT: 2 => 5, 5, 8, 9,
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; RNIT: 2, 3, 4,
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