1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -passes='loop-mssa(loop-instsimplify,loop-simplifycfg,simple-loop-unswitch)' -S %s | FileCheck %s 3 4; Test case from PR54023. After SimpleLoopUnswitch, one of the loops processed 5; by LoopSimplifyCFG will have exit blocks with predecessors outside the loop 6; (i.e. it is not in loop-simplify/canonical form). 7define i32 @test(i32 %v, i1 %c.1, i1 %c.2) { 8; CHECK-LABEL: @test( 9; CHECK-NEXT: entry: 10; CHECK-NEXT: br label [[OUTER_HEADER:%.*]] 11; CHECK: outer.header: 12; CHECK-NEXT: br i1 [[C_1:%.*]], label [[OUTER_LATCH:%.*]], label [[INNER_HEADER_PREHEADER:%.*]] 13; CHECK: inner.header.preheader: 14; CHECK-NEXT: br label [[INNER_HEADER:%.*]] 15; CHECK: inner.header: 16; CHECK-NEXT: [[CMP_2:%.*]] = icmp ne i32 [[V:%.*]], 0 17; CHECK-NEXT: br i1 [[CMP_2]], label [[EXIT:%.*]], label [[INNER_LATCH:%.*]] 18; CHECK: inner.latch: 19; CHECK-NEXT: br i1 [[C_2:%.*]], label [[OUTER_LATCH_LOOPEXIT:%.*]], label [[INNER_HEADER]] 20; CHECK: outer.latch.loopexit: 21; CHECK-NEXT: br label [[OUTER_LATCH]] 22; CHECK: outer.latch: 23; CHECK-NEXT: br label [[OUTER_HEADER]] 24; CHECK: exit: 25; CHECK-NEXT: [[RES:%.*]] = phi i32 [ [[V]], [[INNER_HEADER]] ] 26; CHECK-NEXT: br label [[EXIT_SPLIT:%.*]] 27; CHECK: exit.split: 28; CHECK-NEXT: [[RES_SPLIT:%.*]] = phi i32 [ [[RES]], [[EXIT]] ] 29; CHECK-NEXT: ret i32 [[RES_SPLIT]] 30; 31entry: 32 br label %outer.header 33 34outer.header: 35 %g.0 = phi i32 [ 10, %outer.latch ], [ 1, %entry ] 36 %cmp.1 = icmp eq i32 %g.0, 0 37 br i1 %c.1, label %outer.latch, label %inner.header 38 39inner.header: 40 %cmp.2 = icmp ne i32 %v, 0 41 %or.cond = or i1 %cmp.1, %cmp.2 42 br i1 %or.cond, label %exit, label %inner.latch 43 44inner.latch: 45 br i1 %c.2, label %outer.latch, label %inner.header 46 47outer.latch: 48 br label %outer.header 49 50exit: 51 %res = phi i32 [ %v, %inner.header ] 52 ret i32 %res 53} 54