1 ; Test merging of blocks that only have PHI nodes in them
3 ; RUN: opt < %s -simplifycfg -S | FileCheck %s
6 define i32 @test(i1 %a, i1 %b) {
7 br i1 %a, label %M, label %O
9 ; CHECK: select i1 %b, i32 0, i32 1
11 br i1 %b, label %N, label %Q
15 ; This block should be foldable into M
16 %Wp = phi i32 [ 0, %O ], [ 1, %Q ] ; <i32> [#uses=1]
19 %W = phi i32 [ %Wp, %N ], [ 2, %0 ] ; <i32> [#uses=1]
20 %R = add i32 %W, 1 ; <i32> [#uses=1]