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1; RUN: opt -S -passes=loop-unroll -unroll-runtime < %s | FileCheck %s2 3; Epilog unroll allows to keep PHI constant value.4; For the test this means that after unroll XOR could be deleted.5; Check that we do epilogue reminder here.6 7; CHECK-LABEL: const_phi_val8; CHECK: for.body.epil9 10; Function Attrs: norecurse nounwind uwtable11define void @const_phi_val(i32 %i0, ptr nocapture %a) {12entry:13 %cmp6 = icmp slt i32 %i0, 100014 br i1 %cmp6, label %for.body.preheader, label %for.end15 16for.body.preheader: ; preds = %entry17 %tmp = sext i32 %i0 to i6418 br label %for.body19 20for.body: ; preds = %for.body, %for.body.preheader21 %indvars.iv = phi i64 [ %tmp, %for.body.preheader ], [ %indvars.iv.next, %for.body ]22 %s.08 = phi i32 [ 0, %for.body.preheader ], [ %xor, %for.body ]23 %arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv24 store i32 %s.08, ptr %arrayidx, align 425 %xor = xor i32 %s.08, 126 %indvars.iv.next = add nsw i64 %indvars.iv, 127 %exitcond = icmp eq i64 %indvars.iv.next, 100028 br i1 %exitcond, label %for.end.loopexit, label %for.body29 30for.end.loopexit: ; preds = %for.body31 br label %for.end32 33for.end: ; preds = %for.end.loopexit, %entry34 ret void35}36 37; When there is no phi with const coming from preheader,38; there is no need to do epilogue unrolling.39 40; CHECK-LABEL: var_phi_val41; CHECK: for.body.prol42 43; Function Attrs: norecurse nounwind uwtable44define void @var_phi_val(i32 %i0, ptr nocapture %a) {45entry:46 %cmp6 = icmp slt i32 %i0, 100047 br i1 %cmp6, label %for.body.preheader, label %for.end48 49for.body.preheader: ; preds = %entry50 %tmp = sext i32 %i0 to i6451 br label %for.body52 53for.body: ; preds = %for.body, %for.body.preheader54 %indvars.iv = phi i64 [ %tmp, %for.body.preheader ], [ %indvars.iv.next, %for.body ]55 %arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv56 %indvars.iv.next = add nsw i64 %indvars.iv, 157 %exitcond = icmp eq i64 %indvars.iv.next, 100058 br i1 %exitcond, label %for.end.loopexit, label %for.body59 60for.end.loopexit: ; preds = %for.body61 br label %for.end62 63for.end: ; preds = %for.end.loopexit, %entry64 ret void65}66