| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN:opt -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S %s | FileCheck %s |
| |
| ; For %for.1, we are fine initially, because the previous value %for.1.next dominates the |
| ; user of %for.1. But for %for.2, we have to sink the user (%for.1.next) past the previous |
| ; value %for.2.next. This however breaks the condition we have for %for.1. We cannot fix |
| ; both first order recurrences and cannot vectorize the loop. |
| define i32 @c(i32 %N) { |
| ; CHECK-LABEL: @c( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[FOR_BODY:%.*]] |
| ; CHECK: for.body: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[INC:%.*]], [[FOR_BODY]] ], [ 10, [[ENTRY:%.*]] ] |
| ; CHECK-NEXT: [[FOR_1:%.*]] = phi i32 [ [[FOR_1_NEXT:%.*]], [[FOR_BODY]] ], [ 20, [[ENTRY]] ] |
| ; CHECK-NEXT: [[FOR_2:%.*]] = phi i32 [ [[FOR_2_NEXT:%.*]], [[FOR_BODY]] ], [ 11, [[ENTRY]] ] |
| ; CHECK-NEXT: [[FOR_1_NEXT]] = add nsw i32 [[FOR_2]], 1 |
| ; CHECK-NEXT: [[FOR_2_NEXT]] = shl i32 [[FOR_1]], 24 |
| ; CHECK-NEXT: [[INC]] = add nsw i32 [[IV]], 1 |
| ; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i32 [[INC]], [[N:%.*]] |
| ; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_COND1_FOR_END_CRIT_EDGE:%.*]], label [[FOR_BODY]] |
| ; CHECK: for.cond1.for.end_crit_edge: |
| ; CHECK-NEXT: [[ADD_LCSSA:%.*]] = phi i32 [ [[FOR_1_NEXT]], [[FOR_BODY]] ] |
| ; CHECK-NEXT: [[SEXT_LCSSA:%.*]] = phi i32 [ [[FOR_2_NEXT]], [[FOR_BODY]] ] |
| ; CHECK-NEXT: [[RES:%.*]] = add i32 [[ADD_LCSSA]], [[SEXT_LCSSA]] |
| ; CHECK-NEXT: ret i32 [[RES]] |
| ; |
| entry: |
| br label %for.body |
| |
| for.body: ; preds = %for.body.preheader, %for.body |
| %iv = phi i32 [ %inc, %for.body ], [ 10, %entry ] |
| %for.1 = phi i32 [ %for.1.next, %for.body ], [ 20, %entry ] |
| %for.2 = phi i32 [ %for.2.next, %for.body ], [ 11, %entry ] |
| %for.1.next = add nsw i32 %for.2, 1 |
| %for.2.next = shl i32 %for.1, 24 |
| %inc = add nsw i32 %iv, 1 |
| %exitcond = icmp eq i32 %inc, %N |
| br i1 %exitcond, label %for.cond1.for.end_crit_edge, label %for.body |
| |
| for.cond1.for.end_crit_edge: ; preds = %for.body |
| %add.lcssa = phi i32 [ %for.1.next, %for.body ] |
| %sext.lcssa = phi i32 [ %for.2.next, %for.body ] |
| %res = add i32 %add.lcssa, %sext.lcssa |
| ret i32 %res |
| } |