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Imported Upstream version 5.18.0.167
Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a
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; Test merging of blocks that only have PHI nodes in them. This tests the case
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; where the mergedinto block doesn't have any PHI nodes, and is in fact
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; dominated by the block-to-be-eliminated
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;
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; RUN: opt < %s -simplifycfg -S | not grep N:
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;
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declare i1 @foo()
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define i32 @test(i1 %a, i1 %b) {
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%c = call i1 @foo()
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br i1 %c, label %N, label %P
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P:
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%d = call i1 @foo()
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br i1 %d, label %N, label %Q
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Q:
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br label %N
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N:
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%W = phi i32 [0, %0], [1, %Q], [2, %P]
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; This block should be foldable into M
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br label %M
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M:
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%R = add i32 %W, 1
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ret i32 %R
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}
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