114 lines
3.9 KiB
LLVM
114 lines
3.9 KiB
LLVM
; RUN: opt -simple-loop-unswitch -enable-nontrivial-unswitch -verify-memoryssa -S %s | FileCheck %s
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; REQUIRES: asserts
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target triple = "x86_64-unknown-linux-gnu"
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declare void @foo()
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; In Test1, there are no definitions. MemorySSA updates insert trivial phis and remove them.
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; Verify all are removed, considering the SLU pass leaves unreachable blocks hanging when the MSSA updates are done.
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; CHECK-LABEL: @Test1
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define void @Test1(i32) {
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header:
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br label %outer
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outer.loopexit.split: ; preds = %continue
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br label %outer.loopexit
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outer.loopexit: ; preds = %outer.loopexit.split.us, %outer.loopexit.split
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br label %outer
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outer: ; preds = %outer.loopexit, %header
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br i1 false, label %outer.split.us, label %outer.split
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outer.split.us: ; preds = %outer
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br label %inner.us
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inner.us: ; preds = %continue.us, %outer.split.us
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br label %overflow.us
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overflow.us: ; preds = %inner.us
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br label %continue.us
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continue.us: ; preds = %overflow.us
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br i1 true, label %outer.loopexit.split.us, label %inner.us
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outer.loopexit.split.us: ; preds = %continue.us
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br label %outer.loopexit
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outer.split: ; preds = %outer
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br label %inner
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inner: ; preds = %continue, %outer.split
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br label %switchme
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switchme: ; preds = %inner
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switch i32 %0, label %continue [
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i32 88, label %go_out
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i32 99, label %case2
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]
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case2: ; preds = %switchme
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br label %continue
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continue: ; preds = %case2, %switchme
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br i1 true, label %outer.loopexit.split, label %inner
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go_out: ; preds = %switchme
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unreachable
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}
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; In Test2 there is a single def (call to foo). There are already Phis in place that are cloned when unswitching.
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; Ensure MemorySSA remains correct. Due to SLU's pruned cloning, continue.us2 becomes unreachable, with an empty Phi that is later cleaned.
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; CHECK-LABEL: @Test2
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define void @Test2(i32) {
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header:
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br label %outer
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outer.loopexit.split: ; preds = %continue
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br label %outer.loopexit
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outer.loopexit: ; preds = %outer.loopexit.split.us, %outer.loopexit.split
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br label %outer
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outer: ; preds = %outer.loopexit, %header
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br i1 false, label %outer.split.us, label %outer.split
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outer.split.us: ; preds = %outer
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br label %inner.us
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inner.us: ; preds = %continue.us, %outer.split.us
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br label %overflow.us
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overflow.us: ; preds = %inner.us
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br label %continue.us
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continue.us: ; preds = %overflow.us
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br i1 true, label %outer.loopexit.split.us, label %inner.us
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outer.loopexit.split.us: ; preds = %continue.us
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br label %outer.loopexit
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outer.split: ; preds = %outer
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br label %inner
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inner: ; preds = %continue, %outer.split
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br label %switchme
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switchme: ; preds = %inner
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switch i32 %0, label %continue [
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i32 88, label %go_out
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i32 99, label %case2
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]
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case2: ; preds = %switchme
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call void @foo()
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br label %continue
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continue: ; preds = %case2, %switchme
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br i1 true, label %outer.loopexit.split, label %inner
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go_out: ; preds = %switchme
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unreachable
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}
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