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https://github.com/c64scene-ar/llvm-6502.git
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35 lines
1.0 KiB
LLVM
35 lines
1.0 KiB
LLVM
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; Test merging of blocks containing complex expressions,
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; with various folding thresholds
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;
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; RUN: opt < %s -simplifycfg -S -phi-node-folding-threshold=1 | grep N:
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; RUN: opt < %s -simplifycfg -S -phi-node-folding-threshold=2 | not grep N:
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; RUN: opt < %s -simplifycfg -S -phi-node-folding-threshold=2 | grep M:
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; RUN: opt < %s -simplifycfg -S -phi-node-folding-threshold=7 | not grep M:
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;
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define i32 @test(i1 %a, i1 %b, i32 %i, i32 %j, i32 %k) {
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entry:
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br i1 %a, label %M, label %O
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O:
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br i1 %b, label %P, label %Q
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P:
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%iaj = add i32 %i, %j
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%iajak = add i32 %iaj, %k
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br label %N
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Q:
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%ixj = xor i32 %i, %j
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%ixjxk = xor i32 %ixj, %k
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br label %N
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N:
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; This phi should be foldable if threshold >= 2
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%Wp = phi i32 [ %iajak, %P ], [ %ixjxk, %Q ]
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%Wp2 = add i32 %Wp, %Wp
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br label %M
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M:
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; This phi should be foldable if threshold >= 7
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%W = phi i32 [ %Wp2, %N ], [ 2, %entry ]
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%R = add i32 %W, 1
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ret i32 %R
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}
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