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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". llvm-svn: 109089
43 lines
1.1 KiB
LLVM
43 lines
1.1 KiB
LLVM
; RUN: opt -regions -analyze < %s | FileCheck %s
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; RUN: opt -regions -stats -analyze < %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 @BZ2_blockSort() nounwind {
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start:
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br label %while
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while:
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br label %while.body134.i.i
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while.body134.i.i:
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br i1 1, label %end, label %w
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w:
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br label %if.end140.i.i
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if.end140.i.i:
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br i1 1, label %while.end186.i.i, label %if.end183.i.i
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if.end183.i.i:
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br label %while.body134.i.i
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while.end186.i.i:
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br label %while
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end:
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ret void
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}
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; CHECK-NOT: =>
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; CHECK: [0] start => <Function Return>
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; CHECK: [1] while => end
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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: start, while, while.body134.i.i, end, w, if.end140.i.i, while.end186.i.i, if.end183.i.i,
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; BBIT: while, while.body134.i.i, w, if.end140.i.i, while.end186.i.i, if.end183.i.i,
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; RNIT: start, while => end, end,
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; RNIT: while, while.body134.i.i, w, if.end140.i.i, while.end186.i.i, if.end183.i.i,
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