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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
49 lines
1.0 KiB
LLVM
49 lines
1.0 KiB
LLVM
; RUN: opt -regions -analyze < %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 %"7"
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7:
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br i1 1, label %"1", label %"8"
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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 %"5"
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5:
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br i1 1, label %"11", label %"12"
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11:
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br label %"6"
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12:
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br label %"6"
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6:
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br i1 1, label %"2", label %"10"
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8:
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br label %"9"
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9:
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br i1 1, label %"13", label %"14"
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13:
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br label %"10"
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14:
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br label %"10"
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10:
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br label %"8"
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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-NEXT: [1] 7 => 3
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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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; BBIT: 0, 7, 1, 2, 5, 11, 6, 10, 8, 9, 13, 14, 12, 3, 4,
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; BBIT: 7, 1, 2, 5, 11, 6, 10, 8, 9, 13, 14, 12,
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; RNIT: 0, 7 => 3, 3, 4,
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; RNIT: 7, 1, 2, 5, 11, 6, 10, 8, 9, 13, 14, 12,
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