| ; RUN: opt -indvars < %s |
| ; PR9424: Attempt to use a SCEVCouldNotCompute object! |
| ; The inner loop computes the Step and Start of the outer loop. |
| ; Call that Vexit. The outer End value is max(2,Vexit), because |
| ; the condition "icmp %4 < 2" does not guard the outer loop. |
| ; SCEV knows that Vexit has range [2,4], so End == Vexit == Start. |
| ; Now we have ExactBECount == 0. However, MinStart == 2 and MaxEnd == 4. |
| ; Since the stride is variable and may wrap, we cannot compute |
| ; MaxBECount. SCEV should override MaxBECount with ExactBECount. |
| |
| define void @bar() nounwind { |
| entry: |
| %. = select i1 undef, i32 2, i32 1 |
| br label %"5.preheader" |
| |
| "4": ; preds = %"5.preheader", %"4" |
| %0 = phi i32 [ 0, %"5.preheader" ], [ %1, %"4" ] |
| %1 = add nsw i32 %0, 1 |
| %2 = icmp sgt i32 %., %1 |
| br i1 %2, label %"4", label %"9" |
| |
| "9": ; preds = %"4" |
| %3 = add i32 %6, 1 |
| %4 = add i32 %3, %1 |
| %5 = icmp slt i32 %4, 2 |
| br i1 %5, label %"5.preheader", label %return |
| |
| "5.preheader": ; preds = %"9", %entry |
| %6 = phi i32 [ 0, %entry ], [ %4, %"9" ] |
| br label %"4" |
| |
| return: ; preds = %"9" |
| ret void |
| } |
