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66 lines
1.8 KiB
66 lines
1.8 KiB
; RUN: opt -S -loop-rotate < %s -verify-loop-info | FileCheck %s
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;
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; Verify that LoopRotate preserves LoopSimplify form even in very peculiar loop
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; structures. We manually validate the CFG with FileCheck because currently we
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; can't cause a failure when LoopSimplify fails to be preserved.
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define void @PR18643() {
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; CHECK-LABEL: @PR18643(
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entry:
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br label %outer.header
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; CHECK: br label %outer.header
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outer.header:
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; CHECK: outer.header:
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br i1 undef, label %inner.header, label %outer.body
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; CHECK-NEXT: br i1 {{[^,]*}}, label %[[INNER_PREROTATE_PREHEADER:[^,]*]], label %outer.body
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; CHECK: [[INNER_PREROTATE_PREHEADER]]:
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; CHECK-NEXT: br i1 {{[^,]*}}, label %[[INNER_PREROTATE_PREHEADER_SPLIT_RETURN:[^,]*]], label %[[INNER_ROTATED_PREHEADER:[^,]*]]
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; CHECK: [[INNER_ROTATED_PREHEADER]]:
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; CHECK-NEXT: br label %inner.body
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inner.header:
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; Now the latch!
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; CHECK: inner.header:
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br i1 undef, label %return, label %inner.body
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; CHECK-NEXT: br i1 {{[^,]*}}, label %[[INNER_SPLIT_RETURN:[^,]*]], label %inner.body
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inner.body:
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; Now the header!
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; CHECK: inner.body:
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br i1 undef, label %outer.latch, label %inner.latch
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; CHECK-NEXT: br i1 {{[^,]*}}, label %[[INNER_SPLIT_OUTER_LATCH:[^,]*]], label %inner.header
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inner.latch:
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; Dead!
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br label %inner.header
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outer.body:
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; CHECK: outer.body:
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br label %outer.latch
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; CHECK-NEXT: br label %outer.latch
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; L2 -> L1 exit edge needs a simplified exit block.
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; CHECK: [[INNER_SPLIT_OUTER_LATCH]]:
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; CHECK-NEXT: br label %outer.latch
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outer.latch:
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; CHECK: outer.latch:
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br label %outer.header
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; CHECK-NEXT: br label %outer.header
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; L1 -> L0 exit edge need sa simplified exit block.
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; CHECK: [[INNER_PREROTATE_PREHEADER_SPLIT_RETURN]]:
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; CHECK-NEXT: br label %return
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; L2 -> L0 exit edge needs a simplified exit block.
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; CHECK: [[INNER_SPLIT_RETURN]]:
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; CHECK-NEXT: br label %return
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return:
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; CHECK: return:
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unreachable
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}
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