diff options
Diffstat (limited to 'llvm/test/Transforms')
| -rw-r--r-- | llvm/test/Transforms/SimplifyCFG/PhiEliminate3.ll | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/llvm/test/Transforms/SimplifyCFG/PhiEliminate3.ll b/llvm/test/Transforms/SimplifyCFG/PhiEliminate3.ll new file mode 100644 index 00000000000..3566b874c0b --- /dev/null +++ b/llvm/test/Transforms/SimplifyCFG/PhiEliminate3.ll @@ -0,0 +1,34 @@ +; Test merging of blocks containing complex expressions, +; with various folding thresholds +; +; RUN: opt < %s -simplifycfg -S -phi-node-folding-threshold=1 | grep N: +; RUN: opt < %s -simplifycfg -S -phi-node-folding-threshold=2 | not grep N: +; RUN: opt < %s -simplifycfg -S -phi-node-folding-threshold=2 | grep M: +; RUN: opt < %s -simplifycfg -S -phi-node-folding-threshold=7 | not grep M: +; + +define i32 @test(i1 %a, i1 %b, i32 %i, i32 %j, i32 %k) { +entry: + br i1 %a, label %M, label %O +O: + br i1 %b, label %P, label %Q +P: + %iaj = add i32 %i, %j + %iajak = add i32 %iaj, %k + br label %N +Q: + %ixj = xor i32 %i, %j + %ixjxk = xor i32 %ixj, %k + br label %N +N: + ; This phi should be foldable if threshold >= 2 + %Wp = phi i32 [ %iajak, %P ], [ %ixjxk, %Q ] + %Wp2 = add i32 %Wp, %Wp + br label %M +M: + ; This phi should be foldable if threshold >= 7 + %W = phi i32 [ %Wp2, %N ], [ 2, %entry ] + %R = add i32 %W, 1 + ret i32 %R +} + |
