1 ; Test merging of blocks that only have PHI nodes in them. This tests the case 2 ; where the mergedinto block doesn't have any PHI nodes, and is in fact 3 ; dominated by the block-to-be-eliminated 4 ; 5 ; RUN: opt < %s -simplifycfg -S | not grep N: 6 ; 7 8 declare i1 @foo() 9 10 define i32 @test(i1 %a, i1 %b) { 11 %c = call i1 @foo() 12 br i1 %c, label %N, label %P 13 P: 14 %d = call i1 @foo() 15 br i1 %d, label %N, label %Q 16 Q: 17 br label %N 18 N: 19 %W = phi i32 [0, %0], [1, %Q], [2, %P] 20 ; This block should be foldable into M 21 br label %M 22 23 M: 24 %R = add i32 %W, 1 25 ret i32 %R 26 } 27 28
