| ; RUN: opt -loop-unswitch -S - < %s | FileCheck %s |
| ; RUN: opt -loop-unswitch -enable-mssa-loop-dependency=true -verify-memoryssa -S - < %s | FileCheck %s |
| |
| ;CHECK-LABEL: @b |
| ;CHECK: [[Loop1:for\.end.*]]: ; preds = %for.cond.us |
| ;CHECK-NEXT: %[[PhiVar1:pdt.*]] = phi i32 [ %pdt.0.us, %for.cond.us ] |
| ;CHECK: [[Loop2:for\.end.*]]: ; preds = %for.cond.us1 |
| ;CHECK-NEXT: %[[PhiVar2:pdt.*]] = phi i32 [ %pdt.0.us2, %for.cond.us1 ] |
| ;CHECK: [[Loop3:for\.end.*]]: ; preds = %for.cond |
| ;CHECK-NEXT: %[[PhiVar3:pdt.*]] = phi i32 [ %pdt.0, %for.cond ] |
| ;CHECK: [[Join1:for\.end.*]]: ; preds = %[[Loop2]], %[[Loop3]] |
| ;CHECK-NEXT: %[[PhiRes1:pdt.*]] = phi i32 [ %[[PhiVar3]], %[[Loop3]] ], [ %[[PhiVar2]], %[[Loop2]] ] |
| ;CHECK: for.end: ; preds = %[[Loop1]], %[[Join1]] |
| ;CHECK-NEXT: %[[PhiRes2:pdt.*]] = phi i32 [ %[[PhiRes1]], %[[Join1]] ], [ %[[PhiVar1]], %[[Loop1]] ] |
| ;CHECK-NEXT: ret i32 %[[PhiRes2]] |
| |
| ; Function Attrs: nounwind uwtable |
| define i32 @b(i32 %x, i32 %y) #0 { |
| entry: |
| br label %for.cond |
| |
| for.cond: ; preds = %for.inc, %entry |
| %pdt.0 = phi i32 [ 1, %entry ], [ %pdt.2, %for.inc ] |
| %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ] |
| %cmp = icmp slt i32 %i.0, 100 |
| br i1 %cmp, label %for.body, label %for.end |
| |
| for.body: ; preds = %for.cond |
| %tobool = icmp ne i32 %x, 0 |
| br i1 %tobool, label %if.then, label %if.else |
| |
| if.then: ; preds = %for.body |
| %mul = mul nsw i32 %pdt.0, 2 |
| br label %if.end6 |
| |
| if.else: ; preds = %for.body |
| %tobool1 = icmp ne i32 %y, 0 |
| br i1 %tobool1, label %if.then2, label %if.else4 |
| |
| if.then2: ; preds = %if.else |
| %mul3 = mul nsw i32 %pdt.0, 3 |
| br label %if.end |
| |
| if.else4: ; preds = %if.else |
| %mul5 = mul nsw i32 %pdt.0, 4 |
| br label %if.end |
| |
| if.end: ; preds = %if.else4, %if.then2 |
| %pdt.1 = phi i32 [ %mul3, %if.then2 ], [ %mul5, %if.else4 ] |
| br label %if.end6 |
| |
| if.end6: ; preds = %if.end, %if.then |
| %pdt.2 = phi i32 [ %mul, %if.then ], [ %pdt.1, %if.end ] |
| br label %for.inc |
| |
| for.inc: ; preds = %if.end6 |
| %inc = add nsw i32 %i.0, 1 |
| br label %for.cond |
| |
| for.end: ; preds = %for.cond |
| ret i32 %pdt.0 |
| } |
| |