1 files changed, 136 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopFusion/four_loops.ll b/llvm/test/Transforms/LoopFusion/four_loops.ll
new file mode 100644
index 00000000000..e03de65846c
--- /dev/null
+++ b/llvm/test/Transforms/LoopFusion/four_loops.ll
@@ -0,0 +1,136 @@
+; RUN: opt -S -loop-fusion < %s | FileCheck %s
+
+@A = common global [1024 x i32] zeroinitializer, align 16
+@B = common global [1024 x i32] zeroinitializer, align 16
+@C = common global [1024 x i32] zeroinitializer, align 16
+@D = common global [1024 x i32] zeroinitializer, align 16
+
+; CHECK: void @dep_free
+; CHECK-NEXT: bb:
+; CHECK-NEXT: br label %[[LOOP1HEADER:bb[0-9]+]]
+; CHECK: [[LOOP1HEADER]]
+; CHECK: br i1 %exitcond12, label %[[LOOP1BODY:bb[0-9]+]], label %[[LOOP2PREHEADER:bb[0-9]+]]
+; CHECK: [[LOOP1BODY]]
+; CHECK: br label %[[LOOP1LATCH:bb[0-9]+]]
+; CHECK: [[LOOP1LATCH]]
+; CHECK: br label %[[LOOP2PREHEADER]]
+; CHECK: [[LOOP2PREHEADER]]
+; CHECK: br i1 %exitcond9, label %[[LOOP2HEADER:bb[0-9]+]], label %[[LOOP3PREHEADER:bb[0-9]+]]
+; CHECK: [[LOOP2HEADER]]
+; CHECK: br label %[[LOOP2LATCH:bb[0-9]+]]
+; CHECK: [[LOOP2LATCH]]
+; CHECK: br label %[[LOOP3PREHEADER]]
+; CHECK: [[LOOP3PREHEADER]]
+; CHECK: br i1 %exitcond6, label %[[LOOP3HEADER:bb[0-9]+]], label %[[LOOP4PREHEADER:bb[0-9]+]]
+; CHECK: [[LOOP3HEADER]]
+; CHECK: br label %[[LOOP3LATCH:bb[0-9]+]]
+; CHECK: [[LOOP3LATCH]]
+; CHECK: br label %[[LOOP4PREHEADER]]
+; CHECK: [[LOOP4PREHEADER]]
+; CHECK: br i1 %exitcond, label %[[LOOP4HEADER:bb[0-9]+]], label %[[LOOP4EXIT:bb[0-9]+]]
+; CHECK: [[LOOP4EXIT]]
+; CHECK: br label %[[FUNCEXIT:bb[0-9]+]]
+; CHECK: [[LOOP4HEADER]]
+; CHECK: br label %[[LOOP4LATCH:bb[0-9]+]]
+; CHECK: [[LOOP4LATCH]]
+; CHECK: br label %[[LOOP1HEADER]]
+; CHECK: [[FUNCEXIT]]
+; CHECK: ret void
+define void @dep_free() {
+bb:
+  br label %bb13
+
+bb13:                                             ; preds = %bb22, %bb
+  %indvars.iv10 = phi i64 [ %indvars.iv.next11, %bb22 ], [ 0, %bb ]
+  %.0 = phi i32 [ 0, %bb ], [ %tmp23, %bb22 ]
+  %exitcond12 = icmp ne i64 %indvars.iv10, 100
+  br i1 %exitcond12, label %bb15, label %bb25
+
+bb15:                                             ; preds = %bb13
+  %tmp = add nsw i32 %.0, -3
+  %tmp16 = add nuw nsw i64 %indvars.iv10, 3
+  %tmp17 = trunc i64 %tmp16 to i32
+  %tmp18 = mul nsw i32 %tmp, %tmp17
+  %tmp19 = trunc i64 %indvars.iv10 to i32
+  %tmp20 = srem i32 %tmp18, %tmp19
+  %tmp21 = getelementptr inbounds [1024 x i32], [1024 x i32]* @A, i64 0, i64 %indvars.iv10
+  store i32 %tmp20, i32* %tmp21, align 4
+  br label %bb22
+
+bb22:                                             ; preds = %bb15
+  %indvars.iv.next11 = add nuw nsw i64 %indvars.iv10, 1
+  %tmp23 = add nuw nsw i32 %.0, 1
+  br label %bb13
+
+bb25:                                             ; preds = %bb35, %bb13
+  %indvars.iv7 = phi i64 [ %indvars.iv.next8, %bb35 ], [ 0, %bb13 ]
+  %.01 = phi i32 [ 0, %bb13 ], [ %tmp36, %bb35 ]
+  %exitcond9 = icmp ne i64 %indvars.iv7, 100
+  br i1 %exitcond9, label %bb27, label %bb38
+
+bb27:                                             ; preds = %bb25
+  %tmp28 = add nsw i32 %.01, -3
+  %tmp29 = add nuw nsw i64 %indvars.iv7, 3
+  %tmp30 = trunc i64 %tmp29 to i32
+  %tmp31 = mul nsw i32 %tmp28, %tmp30
+  %tmp32 = trunc i64 %indvars.iv7 to i32
+  %tmp33 = srem i32 %tmp31, %tmp32
+  %tmp34 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %indvars.iv7
+  store i32 %tmp33, i32* %tmp34, align 4
+  br label %bb35
+
+bb35:                                             ; preds = %bb27
+  %indvars.iv.next8 = add nuw nsw i64 %indvars.iv7, 1
+  %tmp36 = add nuw nsw i32 %.01, 1
+  br label %bb25
+
+bb38:                                             ; preds = %bb48, %bb25
+  %indvars.iv4 = phi i64 [ %indvars.iv.next5, %bb48 ], [ 0, %bb25 ]
+  %.02 = phi i32 [ 0, %bb25 ], [ %tmp49, %bb48 ]
+  %exitcond6 = icmp ne i64 %indvars.iv4, 100
+  br i1 %exitcond6, label %bb40, label %bb51
+
+bb40:                                             ; preds = %bb38
+  %tmp41 = add nsw i32 %.02, -3
+  %tmp42 = add nuw nsw i64 %indvars.iv4, 3
+  %tmp43 = trunc i64 %tmp42 to i32
+  %tmp44 = mul nsw i32 %tmp41, %tmp43
+  %tmp45 = trunc i64 %indvars.iv4 to i32
+  %tmp46 = srem i32 %tmp44, %tmp45
+  %tmp47 = getelementptr inbounds [1024 x i32], [1024 x i32]* @C, i64 0, i64 %indvars.iv4
+  store i32 %tmp46, i32* %tmp47, align 4
+  br label %bb48
+
+bb48:                                             ; preds = %bb40
+  %indvars.iv.next5 = add nuw nsw i64 %indvars.iv4, 1
+  %tmp49 = add nuw nsw i32 %.02, 1
+  br label %bb38
+
+bb51:                                             ; preds = %bb61, %bb38
+  %indvars.iv = phi i64 [ %indvars.iv.next, %bb61 ], [ 0, %bb38 ]
+  %.03 = phi i32 [ 0, %bb38 ], [ %tmp62, %bb61 ]
+  %exitcond = icmp ne i64 %indvars.iv, 100
+  br i1 %exitcond, label %bb53, label %bb52
+
+bb52:                                             ; preds = %bb51
+  br label %bb63
+
+bb53:                                             ; preds = %bb51
+  %tmp54 = add nsw i32 %.03, -3
+  %tmp55 = add nuw nsw i64 %indvars.iv, 3
+  %tmp56 = trunc i64 %tmp55 to i32
+  %tmp57 = mul nsw i32 %tmp54, %tmp56
+  %tmp58 = trunc i64 %indvars.iv to i32
+  %tmp59 = srem i32 %tmp57, %tmp58
+  %tmp60 = getelementptr inbounds [1024 x i32], [1024 x i32]* @D, i64 0, i64 %indvars.iv
+  store i32 %tmp59, i32* %tmp60, align 4
+  br label %bb61
+
+bb61:                                             ; preds = %bb53
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %tmp62 = add nuw nsw i32 %.03, 1
+  br label %bb51
+
+bb63:                                             ; preds = %bb52
+  ret void
+}