llvm/test/Transforms/LoopInterchange/inner-latch-defs-iv.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -passes=loop-interchange -loop-interchange-profitabilities=ignore -S %s | FileCheck %s

; Ensure that induction variables defined in the inner latch don't cause
; problems for loop interchange.

define void @f(ptr %A) {
; CHECK-LABEL: define void @f(
; CHECK-SAME: ptr [[A:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[OUTER_HEADER:.*]]
; CHECK:       [[OUTER_HEADER]]:
; CHECK-NEXT:    [[I:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[I_NEXT:%.*]], %[[OUTER_LATCH:.*]] ]
; CHECK-NEXT:    br label %[[INNER_HEADER:.*]]
; CHECK:       [[INNER_HEADER]]:
; CHECK-NEXT:    [[J:%.*]] = phi i64 [ 0, %[[OUTER_HEADER]] ], [ [[J_NEXT_PHI:%.*]], %[[INNER_LATCH:.*]] ]
; CHECK-NEXT:    [[J_NEXT:%.*]] = add i64 [[J]], 1
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr [256 x i8], ptr [[A]], i64 [[J]], i64 [[I]]
; CHECK-NEXT:    store i8 0, ptr [[GEP]], align 1
; CHECK-NEXT:    br label %[[INNER_LATCH]]
; CHECK:       [[INNER_LATCH]]:
; CHECK-NEXT:    [[J_NEXT_PHI]] = phi i64 [ [[J_NEXT]], %[[INNER_HEADER]] ]
; CHECK-NEXT:    [[EC_J:%.*]] = icmp eq i64 [[J_NEXT]], 256
; CHECK-NEXT:    br i1 [[EC_J]], label %[[OUTER_LATCH]], label %[[INNER_HEADER]]
; CHECK:       [[OUTER_LATCH]]:
; CHECK-NEXT:    [[I_NEXT]] = add i64 [[I]], 1
; CHECK-NEXT:    [[EC_I:%.*]] = icmp eq i64 [[I_NEXT]], 256
; CHECK-NEXT:    br i1 [[EC_I]], label %[[EXIT:.*]], label %[[OUTER_HEADER]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %outer.header

outer.header:
  %i = phi i64 [ 0, %entry ], [ %i.next, %outer.latch ]
  br label %inner.header

inner.header:
  %j = phi i64 [ 0, %outer.header ], [ %j.next.phi, %inner.latch ]
  %j.next = add i64 %j, 1
  %gep = getelementptr [256 x i8], ptr %A, i64 %j, i64 %i
  store i8 0, ptr %gep
  br label %inner.latch

inner.latch:
  %j.next.phi = phi i64 [ %j.next, %inner.header ]
  %ec.j = icmp eq i64 %j.next, 256
  br i1 %ec.j, label %outer.latch, label %inner.header

outer.latch:
  %i.next = add i64 %i, 1
  %ec.i = icmp eq i64 %i.next, 256
  br i1 %ec.i, label %exit, label %outer.header

exit:
  ret void
}