1; RUN: opt < %s -S -loop-unroll -unroll-force-peel-count=1 | FileCheck %s 2 3; Check we don't peel loops where the latch is not the exiting block. 4; CHECK-LABEL: @invariant_backedge_irreducible 5; CHECK: entry: 6; CHECK: br label %header 7; CHECK-NOT: peel 8; CHECK: header: 9; CHECK: br i1 {{.*}} label %latch, label %exiting 10; CHECK: latch: 11; CHECK: br i1 {{.*}} label %header, label %exiting 12; CHECK: exiting: 13; CHECK: br i1 {{.*}} label %latch, label %exit 14 15define i32 @invariant_backedge_irreducible(i32 %a, i32 %b) { 16entry: 17 br label %header 18 19header: 20 %i = phi i32 [ 0, %entry ], [ %inc, %latch ] 21 %cmp.phi = phi i1 [ false, %entry ], [ %cmp, %latch ] 22 br i1 %cmp.phi, label %latch, label %exiting 23 24latch: 25 %inc = add i32 %i, 1 26 %cmp = icmp slt i32 %i, 1000 27 br i1 %cmp, label %header, label %exiting 28 29exiting: 30 %cmp.exiting = phi i1 [ %cmp.phi, %header ], [ %cmp, %latch ] 31 br i1 %cmp.exiting, label %latch, label %exit 32 33exit: 34 ret i32 0 35} 36 37