| ; RUN: opt < %s -loop-unroll -unroll-runtime -unroll-count=2 -verify-scev-maps -S | FileCheck %s |
| |
| ; Check SCEV expansion uses existing value when unrolling an inner loop with runtime trip count in a loop nest. |
| ; The outer loop gets unrolled twice, so we see 2 selects in the outer loop blocks. |
| ; CHECK-LABEL: @foo( |
| ; CHECK-LABEL: for.body.loopexit: |
| ; CHECK: select |
| ; CHECK-LABEL: for.body: |
| ; CHECK: select |
| ; CHECK-NOT: select |
| ; CHECK: ret |
| |
| define void @foo(i32 %xfL, i32 %scaleL) local_unnamed_addr { |
| entry: |
| br label %for.body |
| |
| for.body: ; preds = %for.body5, %for.body, %entry |
| %xfL.addr.033 = phi i32 [ %xfL, %entry ], [ %add, %for.body5 ] |
| %add = add nsw i32 %xfL.addr.033, %scaleL |
| %shr = ashr i32 %add, 16 |
| %cmp.i = icmp slt i32 10, %shr |
| %.sroa.speculated = select i1 %cmp.i, i32 0, i32 %shr |
| %cmp425 = icmp slt i32 0, %.sroa.speculated |
| br i1 %cmp425, label %for.body5.preheader, label %for.end |
| |
| for.body5.preheader: ; preds = %for.body |
| %tmp0 = sext i32 %.sroa.speculated to i64 |
| br label %for.body5 |
| |
| for.body5: ; preds = %for.body5, %for.body5.preheader |
| %indvars.iv = phi i64 [ 0, %for.body5.preheader ], [ %indvars.iv.next, %for.body5 ] |
| %indvars.iv.next = add nsw i64 %indvars.iv, 1 |
| %cmp4 = icmp slt i64 %indvars.iv.next, %tmp0 |
| br i1 %cmp4, label %for.body5, label %for.body |
| |
| for.end: |
| ret void |
| } |
| |