1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -S -passes=loop-unroll -unroll-force-peel-count=1 | FileCheck %s 3 4define i32 @invariant_backedge_irreducible(i32 %a, i32 %b) { 5; CHECK-LABEL: @invariant_backedge_irreducible( 6; CHECK-NEXT: entry: 7; CHECK-NEXT: br label [[HEADER_PEEL_BEGIN:%.*]] 8; CHECK: header.peel.begin: 9; CHECK-NEXT: br label [[HEADER_PEEL:%.*]] 10; CHECK: header.peel: 11; CHECK-NEXT: br i1 false, label [[LATCH_PEEL:%.*]], label [[EXITING_PEEL:%.*]] 12; CHECK: latch.peel: 13; CHECK-NEXT: [[INC_PEEL:%.*]] = add i32 0, 1 14; CHECK-NEXT: [[CMP_PEEL:%.*]] = icmp slt i32 0, 1000 15; CHECK-NEXT: br i1 [[CMP_PEEL]], label [[HEADER_PEEL_NEXT:%.*]], label [[EXITING_PEEL]] 16; CHECK: exiting.peel: 17; CHECK-NEXT: [[CMP_EXITING_PEEL:%.*]] = phi i1 [ false, [[HEADER_PEEL]] ], [ [[CMP_PEEL]], [[LATCH_PEEL]] ] 18; CHECK-NEXT: br i1 [[CMP_EXITING_PEEL]], label [[LATCH_PEEL]], label [[EXIT:%.*]] 19; CHECK: header.peel.next: 20; CHECK-NEXT: br label [[HEADER_PEEL_NEXT1:%.*]] 21; CHECK: header.peel.next1: 22; CHECK-NEXT: br label [[ENTRY_PEEL_NEWPH:%.*]] 23; CHECK: entry.peel.newph: 24; CHECK-NEXT: br label [[HEADER:%.*]] 25; CHECK: header: 26; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[INC_PEEL]], [[ENTRY_PEEL_NEWPH]] ], [ [[INC:%.*]], [[LATCH:%.*]] ] 27; CHECK-NEXT: [[CMP_PHI:%.*]] = phi i1 [ [[CMP_PEEL]], [[ENTRY_PEEL_NEWPH]] ], [ [[CMP:%.*]], [[LATCH]] ] 28; CHECK-NEXT: br i1 [[CMP_PHI]], label [[LATCH]], label [[EXITING:%.*]] 29; CHECK: latch: 30; CHECK-NEXT: [[INC]] = add nsw i32 [[I]], 1 31; CHECK-NEXT: [[CMP]] = icmp slt i32 [[I]], 1000 32; CHECK-NEXT: br i1 [[CMP]], label [[HEADER]], label [[EXITING]], !llvm.loop [[LOOP0:![0-9]+]] 33; CHECK: exiting: 34; CHECK-NEXT: [[CMP_EXITING:%.*]] = phi i1 [ [[CMP_PHI]], [[HEADER]] ], [ [[CMP]], [[LATCH]] ] 35; CHECK-NEXT: br i1 [[CMP_EXITING]], label [[LATCH]], label [[EXIT_LOOPEXIT:%.*]] 36; CHECK: exit.loopexit: 37; CHECK-NEXT: br label [[EXIT]] 38; CHECK: exit: 39; CHECK-NEXT: ret i32 0 40; 41entry: 42 br label %header 43 44header: 45 %i = phi i32 [ 0, %entry ], [ %inc, %latch ] 46 %cmp.phi = phi i1 [ false, %entry ], [ %cmp, %latch ] 47 br i1 %cmp.phi, label %latch, label %exiting 48 49latch: 50 %inc = add i32 %i, 1 51 %cmp = icmp slt i32 %i, 1000 52 br i1 %cmp, label %header, label %exiting 53 54exiting: 55 %cmp.exiting = phi i1 [ %cmp.phi, %header ], [ %cmp, %latch ] 56 br i1 %cmp.exiting, label %latch, label %exit 57 58exit: 59 ret i32 0 60} 61 62