diff --git a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
--- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
+++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -5133,6 +5133,8 @@
       {4, MVT::v8i32, 16}, // (load 32i32 and) deinterleave into 4 x 8i32
       {4, MVT::v16i32, 32}, // (load 64i32 and) deinterleave into 4 x 16i32
 
+      {4, MVT::v2i64, 6}, // (load 8i64 and) deinterleave into 4 x 2i64
+
       {6, MVT::v2i8, 6}, // (load 12i8 and) deinterleave into 6 x 2i8
       {6, MVT::v4i8, 14}, // (load 24i8 and) deinterleave into 6 x 4i8
       {6, MVT::v8i8, 18}, // (load 48i8 and) deinterleave into 6 x 8i8
@@ -5210,6 +5212,8 @@
       {4, MVT::v8i32, 16},  // interleave 4 x 8i32 into 32i32 (and store)
       {4, MVT::v16i32, 32},  // interleave 4 x 16i32 into 64i32 (and store)
 
+      {4, MVT::v2i64, 6},  // interleave 4 x 2i64 into 8i64 (and store)
+
       {6, MVT::v2i8, 7},  // interleave 6 x 2i8 into 12i8 (and store)
       {6, MVT::v4i8, 9},  // interleave 6 x 4i8 into 24i8 (and store)
       {6, MVT::v8i8, 16},  // interleave 6 x 8i8 into 48i8 (and store)
diff --git a/llvm/test/Analysis/CostModel/X86/interleaved-load-f64-stride-4.ll b/llvm/test/Analysis/CostModel/X86/interleaved-load-f64-stride-4.ll
--- a/llvm/test/Analysis/CostModel/X86/interleaved-load-f64-stride-4.ll
+++ b/llvm/test/Analysis/CostModel/X86/interleaved-load-f64-stride-4.ll
@@ -22,7 +22,7 @@
 ; AVX1: LV: Found an estimated cost of 64 for VF 8 For instruction:   %v0 = load double, double* %in0, align 8
 ;
 ; AVX2: LV: Found an estimated cost of 1 for VF 1 For instruction:   %v0 = load double, double* %in0, align 8
-; AVX2: LV: Found an estimated cost of 14 for VF 2 For instruction:   %v0 = load double, double* %in0, align 8
+; AVX2: LV: Found an estimated cost of 8 for VF 2 For instruction:   %v0 = load double, double* %in0, align 8
 ; AVX2: LV: Found an estimated cost of 32 for VF 4 For instruction:   %v0 = load double, double* %in0, align 8
 ; AVX2: LV: Found an estimated cost of 64 for VF 8 For instruction:   %v0 = load double, double* %in0, align 8
 ;
diff --git a/llvm/test/Analysis/CostModel/X86/interleaved-load-i64-stride-4.ll b/llvm/test/Analysis/CostModel/X86/interleaved-load-i64-stride-4.ll
--- a/llvm/test/Analysis/CostModel/X86/interleaved-load-i64-stride-4.ll
+++ b/llvm/test/Analysis/CostModel/X86/interleaved-load-i64-stride-4.ll
@@ -22,7 +22,7 @@
 ; AVX1: LV: Found an estimated cost of 104 for VF 8 For instruction:   %v0 = load i64, i64* %in0, align 8
 ;
 ; AVX2: LV: Found an estimated cost of 1 for VF 1 For instruction:   %v0 = load i64, i64* %in0, align 8
-; AVX2: LV: Found an estimated cost of 22 for VF 2 For instruction:   %v0 = load i64, i64* %in0, align 8
+; AVX2: LV: Found an estimated cost of 8 for VF 2 For instruction:   %v0 = load i64, i64* %in0, align 8
 ; AVX2: LV: Found an estimated cost of 52 for VF 4 For instruction:   %v0 = load i64, i64* %in0, align 8
 ; AVX2: LV: Found an estimated cost of 104 for VF 8 For instruction:   %v0 = load i64, i64* %in0, align 8
 ;
diff --git a/llvm/test/Analysis/CostModel/X86/interleaved-store-f64-stride-4.ll b/llvm/test/Analysis/CostModel/X86/interleaved-store-f64-stride-4.ll
--- a/llvm/test/Analysis/CostModel/X86/interleaved-store-f64-stride-4.ll
+++ b/llvm/test/Analysis/CostModel/X86/interleaved-store-f64-stride-4.ll
@@ -22,7 +22,7 @@
 ; AVX1: LV: Found an estimated cost of 64 for VF 8 For instruction:   store double %v3, double* %out3, align 8
 ;
 ; AVX2: LV: Found an estimated cost of 1 for VF 1 For instruction:   store double %v3, double* %out3, align 8
-; AVX2: LV: Found an estimated cost of 12 for VF 2 For instruction:   store double %v3, double* %out3, align 8
+; AVX2: LV: Found an estimated cost of 8 for VF 2 For instruction:   store double %v3, double* %out3, align 8
 ; AVX2: LV: Found an estimated cost of 32 for VF 4 For instruction:   store double %v3, double* %out3, align 8
 ; AVX2: LV: Found an estimated cost of 64 for VF 8 For instruction:   store double %v3, double* %out3, align 8
 ;
diff --git a/llvm/test/Analysis/CostModel/X86/interleaved-store-i64-stride-4.ll b/llvm/test/Analysis/CostModel/X86/interleaved-store-i64-stride-4.ll
--- a/llvm/test/Analysis/CostModel/X86/interleaved-store-i64-stride-4.ll
+++ b/llvm/test/Analysis/CostModel/X86/interleaved-store-i64-stride-4.ll
@@ -22,7 +22,7 @@
 ; AVX1: LV: Found an estimated cost of 104 for VF 8 For instruction:   store i64 %v3, i64* %out3, align 8
 ;
 ; AVX2: LV: Found an estimated cost of 1 for VF 1 For instruction:   store i64 %v3, i64* %out3, align 8
-; AVX2: LV: Found an estimated cost of 22 for VF 2 For instruction:   store i64 %v3, i64* %out3, align 8
+; AVX2: LV: Found an estimated cost of 8 for VF 2 For instruction:   store i64 %v3, i64* %out3, align 8
 ; AVX2: LV: Found an estimated cost of 52 for VF 4 For instruction:   store i64 %v3, i64* %out3, align 8
 ; AVX2: LV: Found an estimated cost of 104 for VF 8 For instruction:   store i64 %v3, i64* %out3, align 8
 ;