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Diffstat (limited to 'test/Feature/cfgstructures.ll')
-rw-r--r-- | test/Feature/cfgstructures.ll | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/test/Feature/cfgstructures.ll b/test/Feature/cfgstructures.ll new file mode 100644 index 0000000..e667f6d --- /dev/null +++ b/test/Feature/cfgstructures.ll @@ -0,0 +1,53 @@ +; RUN: llvm-as < %s | llvm-dis > %t1.ll +; RUN: llvm-as %t1.ll -o - | llvm-dis > %t2.ll +; RUN: diff %t1.ll %t2.ll + +;; This is an irreducible flow graph +define void @irreducible(i1 %cond) { + br i1 %cond, label %X, label %Y + +X: ; preds = %Y, %0 + br label %Y + +Y: ; preds = %X, %0 + br label %X +} + +;; This is a pair of loops that share the same header +define void @sharedheader(i1 %cond) { + br label %A + +A: ; preds = %Y, %X, %0 + br i1 %cond, label %X, label %Y + +X: ; preds = %A + br label %A + +Y: ; preds = %A + br label %A +} + + +;; This is a simple nested loop +define void @nested(i1 %cond1, i1 %cond2, i1 %cond3) { + br label %Loop1 + +Loop1: ; preds = %L2Exit, %0 + br label %Loop2 + +Loop2: ; preds = %L3Exit, %Loop1 + br label %Loop3 + +Loop3: ; preds = %Loop3, %Loop2 + br i1 %cond3, label %Loop3, label %L3Exit + +L3Exit: ; preds = %Loop3 + br i1 %cond2, label %Loop2, label %L2Exit + +L2Exit: ; preds = %L3Exit + br i1 %cond1, label %Loop1, label %L1Exit + +L1Exit: ; preds = %L2Exit + ret void +} + |