40 lines · plain
1; RUN: opt < %s -passes=loop-unroll -unroll-runtime -unroll-count=2 -S | FileCheck %s2 3; Check SCEV expansion uses existing value when unrolling an inner loop with runtime trip count in a loop nest.4; The outer loop gets unrolled twice, so we see 2 selects in the outer loop blocks.5; CHECK-LABEL: @foo(6; CHECK-LABEL: for.body.loopexit:7; CHECK: select8; CHECK-LABEL: for.body:9; CHECK: select10; CHECK-NOT: select11; CHECK: ret12 13define void @foo(i32 %xfL, i32 %scaleL) local_unnamed_addr {14entry:15 br label %for.body16 17for.body: ; preds = %for.body5, %for.body, %entry18 %xfL.addr.033 = phi i32 [ %xfL, %entry ], [ %add, %for.body5 ]19 %add = add nsw i32 %xfL.addr.033, %scaleL20 %shr = ashr i32 %add, 1621 %cmp.i = icmp slt i32 10, %shr22 %.sroa.speculated = select i1 %cmp.i, i32 0, i32 %shr23 %cmp425 = icmp slt i32 0, %.sroa.speculated24 br i1 %cmp425, label %for.body5.preheader, label %for.end25 26for.body5.preheader: ; preds = %for.body27 %tmp0 = sext i32 %.sroa.speculated to i6428 br label %for.body529 30for.body5: ; preds = %for.body5, %for.body5.preheader31 %indvars.iv = phi i64 [ 0, %for.body5.preheader ], [ %indvars.iv.next, %for.body5 ]32 %indvars.iv.next = add nsw i64 %indvars.iv, 133 %cmp4 = icmp slt i64 %indvars.iv.next, %tmp034 br i1 %cmp4, label %for.body5, label %for.body35 36for.end:37 ret void38}39 40