llvm/test/Transforms/LoopInterchange/outer-only-reductions.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt < %s -passes=loop-interchange -cache-line-size=64 -S | FileCheck %s

; Outer loop only reductions are not supported currently.

@A = common global [500 x [500 x i32]] zeroinitializer

;; global X

;;  for( int i=1;i<N;i++) {
;;    for( int j=1;j<N;j++)
;;      ;
;;    X+=A[j][i];
;;  }

define i32 @reduction_01(i32 %N) {
; CHECK-LABEL: define i32 @reduction_01(
; CHECK-SAME: i32 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[OUTER_HEADER:.*]]
; CHECK:       [[OUTER_HEADER]]:
; CHECK-NEXT:    [[INDVARS_IV18:%.*]] = phi i64 [ [[INDVARS_IV_NEXT19:%.*]], %[[OUTER_INC:.*]] ], [ 1, %[[ENTRY]] ]
; CHECK-NEXT:    [[ADD15:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[ADD:%.*]], %[[OUTER_INC]] ]
; CHECK-NEXT:    br label %[[FOR_BODY3:.*]]
; CHECK:       [[FOR_BODY3]]:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ 1, %[[OUTER_HEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], %[[FOR_BODY3]] ]
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[LFTR_WIDEIV:%.*]] = trunc i64 [[INDVARS_IV_NEXT]] to i32
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i32 [[LFTR_WIDEIV]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND]], label %[[OUTER_INC]], label %[[FOR_BODY3]]
; CHECK:       [[OUTER_INC]]:
; CHECK-NEXT:    [[INDVARS_IV_LCSSA:%.*]] = phi i64 [ [[INDVARS_IV]], %[[FOR_BODY3]] ]
; CHECK-NEXT:    [[ARRAYIDX5:%.*]] = getelementptr inbounds [500 x [500 x i32]], ptr @A, i64 0, i64 [[INDVARS_IV_LCSSA]], i64 [[INDVARS_IV18]]
; CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[ARRAYIDX5]], align 4
; CHECK-NEXT:    [[ADD]] = add nsw i32 [[ADD15]], [[TMP0]]
; CHECK-NEXT:    [[INDVARS_IV_NEXT19]] = add nuw nsw i64 [[INDVARS_IV18]], 1
; CHECK-NEXT:    [[LFTR_WIDEIV20:%.*]] = trunc i64 [[INDVARS_IV_NEXT19]] to i32
; CHECK-NEXT:    [[EXITCOND21:%.*]] = icmp eq i32 [[LFTR_WIDEIV20]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND21]], label %[[FOR_END8:.*]], label %[[OUTER_HEADER]]
; CHECK:       [[FOR_END8]]:
; CHECK-NEXT:    [[ADD_LCSSA:%.*]] = phi i32 [ [[ADD]], %[[OUTER_INC]] ]
; CHECK-NEXT:    ret i32 [[ADD_LCSSA]]
;
entry:
  br label %outer.header

outer.header:                                  ; preds = %for.cond1.for.inc6_crit_edge, %entry
  %indvars.iv18 = phi i64 [ %indvars.iv.next19, %outer.inc ], [ 1, %entry ]
  %add15 = phi i32 [ 0, %entry ], [ %add, %outer.inc ]
  br label %for.body3

for.body3:                                        ; preds = %for.body3, %for.body3.lr.ph
  %indvars.iv = phi i64 [ 1, %outer.header ], [ %indvars.iv.next, %for.body3 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond = icmp eq i32 %lftr.wideiv, %N
  br i1 %exitcond, label %outer.inc, label %for.body3

outer.inc:                     ; preds = %for.body3
  %arrayidx5 = getelementptr inbounds [500 x [500 x i32]], ptr @A, i64 0, i64 %indvars.iv, i64 %indvars.iv18
  %0 = load i32, ptr %arrayidx5
  %add = add nsw i32 %add15, %0
  %indvars.iv.next19 = add nuw nsw i64 %indvars.iv18, 1
  %lftr.wideiv20 = trunc i64 %indvars.iv.next19 to i32
  %exitcond21 = icmp eq i32 %lftr.wideiv20, %N
  br i1 %exitcond21, label %for.end8, label %outer.header

for.end8:                                         ; preds = %for.cond1.for.inc6_crit_edge, %entry
  ret i32 %add
}