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llvm-project/llvm/test/Analysis/RegionInfo/bad_node_traversal.ll

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RegionInfo: add new test case This test case has been reduced from test/Analysis/RegionInfo/mix_1.ll and provides us with a minimal example of a test case which caused problems while working on an improved version of the RegionInfo analysis. We upstream this test case, as it certainly can be helpful in future debugging and optimization tests. Test case reduced by Pratik Bhatu <cs12b1010@iith.ac.in> llvm-svn: 290974
2017-01-05 01:50:15 +08:00
; REQUIRES: asserts
; RUN: opt -regions -analyze < %s | FileCheck %s
; While working on improvements to the region info analysis, this test
; case caused an incorrect region 3 => 8 to be detected.
define internal i8 @wibble() {
bb:
br i1 true, label %bb1, label %bb8
bb1: ; preds = %bb
switch i32 0, label %bb2 [
i32 0, label %bb3
i32 1, label %bb7
]
bb2: ; preds = %bb1
br label %bb4
bb3: ; preds = %bb1
br label %bb5
bb4: ; preds = %bb2
br label %bb6
bb5: ; preds = %bb3
br label %bb6
bb6: ; preds = %bb5, %bb4
br label %bb7
bb7: ; preds = %bb6, %bb1
br label %bb8
bb8: ; preds = %bb7, %bb
ret i8 1
}
; CHECK: [0] bb => <Function Return>
; CHECK-NEXT: [1] bb => bb8
; CHECK-NEXT: [2] bb1 => bb7
Add missing CHECK: line to test case added in 29097 Without this CHECK line, we may not detect incorrectly detected additional regions at the end of the region tree. llvm-svn: 290994
2017-01-05 03:35:38 +08:00
; CHECK-NEXT: End region tree
RegionInfo: add new test case This test case has been reduced from test/Analysis/RegionInfo/mix_1.ll and provides us with a minimal example of a test case which caused problems while working on an improved version of the RegionInfo analysis. We upstream this test case, as it certainly can be helpful in future debugging and optimization tests. Test case reduced by Pratik Bhatu <cs12b1010@iith.ac.in> llvm-svn: 290974
2017-01-05 01:50:15 +08:00