llvm/test/Transforms/LoopInterchange/interchange-output-dependencies.ll

; RUN: opt < %s -basicaa -loop-interchange -S | FileCheck %s
;; We test the complete .ll for adjustment in outer loop header/latch and inner loop header/latch.

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@A = common global [100 x [100 x i32]] zeroinitializer

;; Test to make sure we can handle output dependencies.
;;
;;  for (int i = 0; i < 2; ++i)
;;    for(int j = 0; j < 3; ++j) {
;;      A[j][i] = i;
;;      A[j][i+1] = j;
;;    }

@A10 = local_unnamed_addr global [3 x [3 x i32]] zeroinitializer, align 16

define void @interchange_10() {
entry:
  br label %for.cond1.preheader

for.cond.loopexit:                                ; preds = %for.body4
  %exitcond28 = icmp ne i64 %indvars.iv.next27, 2
  br i1 %exitcond28, label %for.cond1.preheader, label %for.cond.cleanup

for.cond1.preheader:                              ; preds = %for.cond.loopexit, %entry
  %indvars.iv26 = phi i64 [ 0, %entry ], [ %indvars.iv.next27, %for.cond.loopexit ]
  %indvars.iv.next27 = add nuw nsw i64 %indvars.iv26, 1
  br label %for.body4

for.cond.cleanup:                                 ; preds = %for.cond.loopexit
  ret void

for.body4:                                        ; preds = %for.body4, %for.cond1.preheader
  %indvars.iv = phi i64 [ 0, %for.cond1.preheader ], [ %indvars.iv.next, %for.body4 ]
  %arrayidx6 = getelementptr inbounds [3 x [3 x i32]], [3 x [3 x i32]]* @A10, i64 0, i64 %indvars.iv, i64 %indvars.iv26
  %tmp = trunc i64 %indvars.iv26 to i32
  store i32 %tmp, i32* %arrayidx6, align 4
  %arrayidx10 = getelementptr inbounds [3 x [3 x i32]], [3 x [3 x i32]]* @A10, i64 0, i64 %indvars.iv, i64 %indvars.iv.next27
  %tmp1 = trunc i64 %indvars.iv to i32
  store i32 %tmp1, i32* %arrayidx10, align 4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond = icmp ne i64 %indvars.iv.next, 3
  br i1 %exitcond, label %for.body4, label %for.cond.loopexit
}

; CHECK-LABEL: @interchange_10
; CHECK: entry:
; CHECK:   br label %for.body4.preheader

; CHECK: for.cond1.preheader.preheader:
; CHECK:   br label %for.cond1.preheader

; CHECK: for.cond.loopexit:
; CHECK:   %exitcond28 = icmp ne i64 %indvars.iv.next27, 2
; CHECK:   br i1 %exitcond28, label %for.cond1.preheader, label %for.body4.split

; CHECK: for.cond1.preheader:
; CHECK:   %indvars.iv26 = phi i64 [ %indvars.iv.next27, %for.cond.loopexit ], [ 0, %for.cond1.preheader.preheader ]
; CHECK:   %indvars.iv.next27 = add nuw nsw i64 %indvars.iv26, 1
; CHECK:   br label %for.body4.split1

; CHECK: for.body4.preheader:
; CHECK:   br label %for.body4

; CHECK: for.cond.cleanup:
; CHECK:   ret void

; CHECK: for.body4:
; CHECK:   %indvars.iv = phi i64 [ %indvars.iv.next, %for.body4.split ], [ 0, %for.body4.preheader ]
; CHECK:   br label %for.cond1.preheader.preheader

; CHECK: for.body4.split1:
; CHECK:   %arrayidx6 = getelementptr inbounds [3 x [3 x i32]], [3 x [3 x i32]]* @A10, i64 0, i64 %indvars.iv, i64 %indvars.iv26
; CHECK:   %tmp = trunc i64 %indvars.iv26 to i32
; CHECK:   store i32 %tmp, i32* %arrayidx6, align 4
; CHECK:   %arrayidx10 = getelementptr inbounds [3 x [3 x i32]], [3 x [3 x i32]]* @A10, i64 0, i64 %indvars.iv, i64 %indvars.iv.next27
; CHECK:   %tmp1 = trunc i64 %indvars.iv to i32
; CHECK:   store i32 %tmp1, i32* %arrayidx10, align 4
; CHECK:   br label %for.cond.loopexit

; CHECK: for.body4.split:
; CHECK:   %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
; CHECK:   %exitcond = icmp ne i64 %indvars.iv.next, 3
; CHECK:   br i1 %exitcond, label %for.body4, label %for.cond.cleanup