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llvm-mirror/test/Transforms/ADCE/basictest.ll
Roman Lebedev eda37b998a [SimplifyCFG] MergeBlockIntoPredecessor() already knows how to preserve DomTree
... so just ensure that we pass DomTreeUpdater it into it.

Fixes DomTree preservation for a large number of tests,
all of which are marked as such so that they do not regress.
2020-12-17 01:03:49 +03:00

19 lines
514 B
LLVM

; RUN: opt < %s -adce -simplifycfg -simplifycfg-require-and-preserve-domtree=1 | llvm-dis
; RUN: opt < %s -passes=adce | llvm-dis
define i32 @Test(i32 %A, i32 %B) {
BB1:
br label %BB4
BB2: ; No predecessors!
br label %BB3
BB3: ; preds = %BB4, %BB2
%ret = phi i32 [ %X, %BB4 ], [ %B, %BB2 ] ; <i32> [#uses=1]
ret i32 %ret
BB4: ; preds = %BB1
%X = phi i32 [ %A, %BB1 ] ; <i32> [#uses=1]
br label %BB3
}