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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
61 lines
1.5 KiB
LLVM
61 lines
1.5 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 internal fastcc zeroext i8 @handle_compress() nounwind {
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end165:
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br i1 1, label %false239, label %true181
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true181:
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br i1 1, label %then187, label %else232
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then187:
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br label %end265
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else232:
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br i1 1, label %false239, label %then245
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false239:
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br i1 1, label %then245, label %else259
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then245:
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br i1 1, label %then251, label %end253
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then251:
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br label %end253
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end253:
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br label %end265
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else259:
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br label %end265
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end265:
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br i1 1, label %then291, label %end298
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then291:
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br label %end298
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end298:
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ret i8 1
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}
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; CHECK-NOT: =>
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; CHECK: [0] end165 => <Function Return>
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; CHECK-NEXT: [1] end165 => end265
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; CHECK-NEXT: [2] then245 => end253
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; CHECK-NEXT: [1] end265 => end298
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; STAT: 4 region - The # of regions
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; BBIT: end165, false239, then245, then251, end253, end265, then291, end298, else259, true181, then187, else232,
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; BBIT: end165, false239, then245, then251, end253, else259, true181, then187, else232,
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; BBIT: then245, then251,
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; BBIT: end265, then291,
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; RNIT: end165 => end265, end265 => end298, end298,
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; RNIT: end165, false239, then245 => end253, end253, else259, true181, then187, else232,
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; RNIT: then245, then251,
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; RNIT: end265, then291,
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