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54 lines
1.2 KiB
54 lines
1.2 KiB
; RUN: llvm-as < %s | llvm-dis > %t1.ll
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; RUN: llvm-as %t1.ll -o - | llvm-dis > %t2.ll
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; RUN: diff %t1.ll %t2.ll
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;; This is an irreducible flow graph
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define void @irreducible(i1 %cond) {
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br i1 %cond, label %X, label %Y
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X: ; preds = %Y, %0
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br label %Y
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Y: ; preds = %X, %0
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br label %X
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}
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;; This is a pair of loops that share the same header
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define void @sharedheader(i1 %cond) {
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br label %A
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A: ; preds = %Y, %X, %0
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br i1 %cond, label %X, label %Y
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X: ; preds = %A
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br label %A
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Y: ; preds = %A
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br label %A
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}
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;; This is a simple nested loop
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define void @nested(i1 %cond1, i1 %cond2, i1 %cond3) {
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br label %Loop1
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Loop1: ; preds = %L2Exit, %0
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br label %Loop2
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Loop2: ; preds = %L3Exit, %Loop1
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br label %Loop3
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Loop3: ; preds = %Loop3, %Loop2
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br i1 %cond3, label %Loop3, label %L3Exit
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L3Exit: ; preds = %Loop3
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br i1 %cond2, label %Loop2, label %L2Exit
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L2Exit: ; preds = %L3Exit
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br i1 %cond1, label %Loop1, label %L1Exit
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L1Exit: ; preds = %L2Exit
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ret void
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}
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