[X86][Costmodel] Load/store i16 Stride=2 VF=8 interleaving costs

The only sched models that for cpu's that support avx2
but not avx512 are: haswell, broadwell, skylake, zen1-3

For load we have:
https://godbolt.org/z/e5YE99a4P - for intels `Block RThroughput: =6.0`; for ryzens, `Block RThroughput: =2.0`
So pick cost of `6`.

For store we have:
https://godbolt.org/z/3vM4KsE1n - for intels `Block RThroughput: =3.0`; for ryzens, `Block RThroughput: <=2.0`
So pick cost of `3`.

I'm directly using the shuffling asm the llc produced,
without any manual fixups that may be needed
to ensure sequential execution.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D110505

llvm/lib/Target/X86/X86TargetTransformInfo.cpp

@@ -5065,6 +5065,7 @@ InstructionCost X86TTIImpl::getInterleavedMemoryOpCostAVX2(
   static const CostTblEntry AVX2InterleavedLoadTbl[] = {
       {2, MVT::v2i16, 2}, // (load 4i16 and) deinterleave into 2 x 2i16
       {2, MVT::v4i16, 2}, // (load 8i16 and) deinterleave into 2 x 4i16
+      {2, MVT::v8i16, 6}, // (load 16i16 and) deinterleave into 2 x 8i16
 
       {2, MVT::v4i64, 6}, // (load 8i64 and) deinterleave into 2 x 4i64
 
@@ -5088,6 +5089,7 @@ InstructionCost X86TTIImpl::getInterleavedMemoryOpCostAVX2(
   static const CostTblEntry AVX2InterleavedStoreTbl[] = {
       {2, MVT::v2i16, 1}, // interleave 2 x 2i16 into 4i16 (and store)
       {2, MVT::v4i16, 1}, // interleave 2 x 4i16 into 8i16 (and store)
+      {2, MVT::v8i16, 3}, // interleave 2 x 8i16 into 16i16 (and store)
 
       {2, MVT::v4i64, 6}, // interleave 2 x 4i64 into 8i64 (and store)
 

llvm/test/Analysis/CostModel/X86/interleaved-load-i16-stride-2.ll

@@ -11,7 +11,7 @@ target triple = "x86_64-unknown-linux-gnu"
 ; CHECK: LV: Found an estimated cost of 1 for VF 1 For instruction:   %v0 = load i16, i16* %in0, align 2
 ; CHECK: LV: Found an estimated cost of 3 for VF 2 For instruction:   %v0 = load i16, i16* %in0, align 2
 ; CHECK: LV: Found an estimated cost of 3 for VF 4 For instruction:   %v0 = load i16, i16* %in0, align 2
-; CHECK: LV: Found an estimated cost of 41 for VF 8 For instruction:   %v0 = load i16, i16* %in0, align 2
+; CHECK: LV: Found an estimated cost of 7 for VF 8 For instruction:   %v0 = load i16, i16* %in0, align 2
 ; CHECK: LV: Found an estimated cost of 114 for VF 16 For instruction:   %v0 = load i16, i16* %in0, align 2
 ; CHECK: LV: Found an estimated cost of 228 for VF 32 For instruction:   %v0 = load i16, i16* %in0, align 2
 ; CHECK-NOT: LV: Found an estimated cost of {{[0-9]+}} for VF {{[0-9]+}} For instruction:   %v0 = load i16, i16* %in0, align 2

llvm/test/Analysis/CostModel/X86/interleaved-store-i16-stride-2.ll

@@ -11,7 +11,7 @@ target triple = "x86_64-unknown-linux-gnu"
 ; CHECK: LV: Found an estimated cost of 1 for VF 1 For instruction:   store i16 %v1, i16* %out1, align 2
 ; CHECK: LV: Found an estimated cost of 2 for VF 2 For instruction:   store i16 %v1, i16* %out1, align 2
 ; CHECK: LV: Found an estimated cost of 2 for VF 4 For instruction:   store i16 %v1, i16* %out1, align 2
-; CHECK: LV: Found an estimated cost of 49 for VF 8 For instruction:   store i16 %v1, i16* %out1, align 2
+; CHECK: LV: Found an estimated cost of 4 for VF 8 For instruction:   store i16 %v1, i16* %out1, align 2
 ; CHECK: LV: Found an estimated cost of 114 for VF 16 For instruction:   store i16 %v1, i16* %out1, align 2
 ; CHECK: LV: Found an estimated cost of 228 for VF 32 For instruction:   store i16 %v1, i16* %out1, align 2
 ; CHECK-NOT: LV: Found an estimated cost of {{[0-9]+}} for VF {{[0-9]+}} For instruction:   store i16 %v1, i16* %out1, align 2