test/Transforms/LoopInterchange/phi-to-phi.ll

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

; Check that `%k`, which refers to another phi node, is processed correctly.

define void @f(ptr %A) {
; CHECK-LABEL: define void @f(
; CHECK-SAME: ptr [[A:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[INNER_PREHEADER:.*]]
; CHECK:       [[OUTER_HEADER_PREHEADER:.*]]:
; CHECK-NEXT:    br label %[[OUTER_HEADER:.*]]
; CHECK:       [[OUTER_HEADER]]:
; CHECK-NEXT:    [[I:%.*]] = phi i64 [ [[I_INC:%.*]], %[[OUTER_LATCH:.*]] ], [ 0, %[[OUTER_HEADER_PREHEADER]] ]
; CHECK-NEXT:    br label %[[INNER_SPLIT1:.*]]
; CHECK:       [[INNER_PREHEADER]]:
; CHECK-NEXT:    br label %[[INNER:.*]]
; CHECK:       [[INNER]]:
; CHECK-NEXT:    [[J:%.*]] = phi i64 [ [[TMP0:%.*]], %[[INNER_SPLIT:.*]] ], [ 0, %[[INNER_PREHEADER]] ]
; CHECK-NEXT:    [[K:%.*]] = phi i64 [ [[J]], %[[INNER_SPLIT]] ], [ -1, %[[INNER_PREHEADER]] ]
; CHECK-NEXT:    br label %[[OUTER_HEADER_PREHEADER]]
; CHECK:       [[INNER_SPLIT1]]:
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr [10 x i64], ptr [[A]], i64 [[I]], i64 [[J]]
; CHECK-NEXT:    store i64 [[K]], ptr [[GEP]], align 4
; CHECK-NEXT:    [[J_INC:%.*]] = add i64 [[J]], 1
; CHECK-NEXT:    [[EC_J:%.*]] = icmp eq i64 [[J_INC]], 10
; CHECK-NEXT:    br label %[[OUTER_LATCH]]
; CHECK:       [[INNER_SPLIT]]:
; CHECK-NEXT:    [[TMP0]] = add i64 [[J]], 1
; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i64 [[TMP0]], 10
; CHECK-NEXT:    br i1 [[TMP1]], label %[[EXIT:.*]], label %[[INNER]]
; CHECK:       [[OUTER_LATCH]]:
; CHECK-NEXT:    [[I_INC]] = add i64 [[I]], 1
; CHECK-NEXT:    [[EC_I:%.*]] = icmp eq i64 [[I_INC]], 10
; CHECK-NEXT:    br i1 [[EC_I]], label %[[INNER_SPLIT]], label %[[OUTER_HEADER]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %outer.header

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

inner:
  %j = phi i64 [ 0, %outer.header ], [ %j.inc, %inner ]
  %k = phi i64 [ -1, %outer.header ], [ %j, %inner ]
  %gep = getelementptr [10 x i64], ptr %A, i64 %i, i64 %j
  store i64 %k, ptr %gep
  %j.inc = add i64 %j, 1
  %ec.j = icmp eq i64 %j.inc, 10
  br i1 %ec.j, label %outer.latch, label %inner

outer.latch:
  %i.inc = add i64 %i, 1
  %ec.i = icmp eq i64 %i.inc, 10
  br i1 %ec.i, label %exit, label %outer.header

exit:
  ret void
}