1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; Test merging of blocks that only have PHI nodes in them. This tests the case 3; where the mergedinto block doesn't have any PHI nodes, and is in fact 4; dominated by the block-to-be-eliminated 5; 6; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s 7; 8 9declare i1 @foo() 10 11define i32 @test(i1 %a, i1 %b) { 12; CHECK-LABEL: @test( 13; CHECK-NEXT: [[C:%.*]] = call i1 @foo() 14; CHECK-NEXT: br i1 [[C]], label [[M:%.*]], label [[P:%.*]] 15; CHECK: P: 16; CHECK-NEXT: [[D:%.*]] = call i1 @foo() 17; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[D]], i32 2, i32 1 18; CHECK-NEXT: br label [[M]] 19; CHECK: M: 20; CHECK-NEXT: [[W:%.*]] = phi i32 [ 0, [[TMP0:%.*]] ], [ [[SPEC_SELECT]], [[P]] ] 21; CHECK-NEXT: [[R:%.*]] = add i32 [[W]], 1 22; CHECK-NEXT: ret i32 [[R]] 23; 24 %c = call i1 @foo() 25 br i1 %c, label %N, label %P 26P: 27 %d = call i1 @foo() 28 br i1 %d, label %N, label %Q 29Q: 30 br label %N 31N: 32 %W = phi i32 [0, %0], [1, %Q], [2, %P] 33 ; This block should be foldable into M 34 br label %M 35 36M: 37 %R = add i32 %W, 1 38 ret i32 %R 39} 40 41