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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
41 lines
910 B
LLVM
41 lines
910 B
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 internal fastcc zeroext i8 @loops_1() nounwind {
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entry:
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br i1 1, label %outer , label %a
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a:
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br label %body
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outer:
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br label %body
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body:
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br i1 1, label %land, label %if
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land:
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br i1 1, label %exit, label %end
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exit:
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br i1 1, label %if, label %end
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if:
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br label %outer
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end:
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ret i8 1
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}
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; CHECK-NOT: =>
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; CHECK: [0] entry => <Function Return>
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; CHECK-NEXT: [1] entry => end
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; STAT: 2 region - The # of regions
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; BBIT: entry, outer, body, land, exit, if, end, a,
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; BBIT: entry, outer, body, land, exit, if, a,
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; RNIT: entry => end, end,
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; RNIT: entry, outer, body, land, exit, if, a,
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