1 ; RUN: opt < %s -loop-unroll -unroll-runtime -unroll-count=2 -verify-scev-maps -S | FileCheck %s 2 3 ; Check SCEV expansion uses existing value when unrolling an inner loop with runtime trip count in a loop nest. 4 ; CHECK-LABEL: @foo( 5 ; CHECK: select 6 ; CHECK-NOT: select 7 ; CHECK: ret 8 9 define void @foo(i32 %xfL, i32 %scaleL) local_unnamed_addr { 10 entry: 11 br label %for.body 12 13 for.body: ; preds = %for.body5, %for.body, %entry 14 %xfL.addr.033 = phi i32 [ %xfL, %entry ], [ %add, %for.body5 ] 15 %add = add nsw i32 %xfL.addr.033, %scaleL 16 %shr = ashr i32 %add, 16 17 %cmp.i = icmp slt i32 0, %shr 18 %.sroa.speculated = select i1 %cmp.i, i32 0, i32 %shr 19 %cmp425 = icmp slt i32 0, %.sroa.speculated 20 br i1 %cmp425, label %for.body5.preheader, label %for.end 21 22 for.body5.preheader: ; preds = %for.body 23 %tmp0 = sext i32 %.sroa.speculated to i64 24 br label %for.body5 25 26 for.body5: ; preds = %for.body5, %for.body5.preheader 27 %indvars.iv = phi i64 [ 0, %for.body5.preheader ], [ %indvars.iv.next, %for.body5 ] 28 %indvars.iv.next = add nsw i64 %indvars.iv, 1 29 %cmp4 = icmp slt i64 %indvars.iv.next, %tmp0 30 br i1 %cmp4, label %for.body5, label %for.body 31 32 for.end: 33 ret void 34 } 35 36
