[X86][Costmodel] Load/store i64/f64 Stride=6 VF=2 interleaving costs

[lebedev.ri]

Summary

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/onese7rec - for intels Block RThroughput: =6.0; for ryzens, Block RThroughput: =3.0
So could pick cost of 6.

For store we have:
https://godbolt.org/z/bMd7dddnT - for intels Block RThroughput: =8.0; for ryzens, Block RThroughput: <=6.0
So we could pick cost of 8.

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

[RKSimon]

LGTM

llvm/lib/Target/X86/X86TargetTransformInfo.cpp

static const CostTblEntry AVX2InterleavedLoadTbl[] = {
       {6, MVT::v8i16, 39}, // (load 48i16 and) deinterleave into 6 x 8i16
       {6, MVT::v16i16, 106}, // (load 96i16 and) deinterleave into 6 x 16i16
 
       {6, MVT::v2i32, 6}, // (load 12i32 and) deinterleave into 6 x 2i32
       {6, MVT::v4i32, 15}, // (load 24i32 and) deinterleave into 6 x 4i32
       {6, MVT::v8i32, 31}, // (load 48i32 and) deinterleave into 6 x 8i32
       {6, MVT::v16i32, 64}, // (load 96i32 and) deinterleave into 6 x 16i32
 
+      {6, MVT::v2i64, 6}, // (load 12i64 and) deinterleave into 6 x 2i64
+
       {8, MVT::v8i32, 40} // (load 64i32 and) deinterleave into 8 x 8i32
   };
 
   static const CostTblEntry AVX2InterleavedStoreTbl[] = {
       {2, MVT::v2i8, 1}, // interleave 2 x 2i8 into 4i8 (and store)
       {2, MVT::v4i8, 1}, // interleave 2 x 4i8 into 8i8 (and store)
       {2, MVT::v8i8, 1}, // interleave 2 x 8i8 into 16i8 (and store)
       {2, MVT::v16i8, 3}, // interleave 2 x 16i8 into 32i8 (and store)
static const CostTblEntry AVX2InterleavedStoreTbl[] = {
       {6, MVT::v4i16, 15},  // interleave 6 x 4i16 into 24i16 (and store)
       {6, MVT::v8i16, 21},  // interleave 6 x 8i16 into 48i16 (and store)
       {6, MVT::v16i16, 58},  // interleave 6 x 16i16 into 96i16 (and store)
 
       {6, MVT::v2i32, 9},  // interleave 6 x 2i32 into 12i32 (and store)
       {6, MVT::v4i32, 12},  // interleave 6 x 4i32 into 24i32 (and store)
       {6, MVT::v8i32, 33},  // interleave 6 x 8i32 into 48i32 (and store)
       {6, MVT::v16i32, 66},  // interleave 6 x 16i32 into 96i32 (and store)
+
+      {6, MVT::v2i64, 8},  // interleave 6 x 2i64 into 12i64 (and store)
   };
 
   if (Opcode == Instruction::Load) {
     if (const auto *Entry =
             CostTableLookup(AVX2InterleavedLoadTbl, Factor, ETy.getSimpleVT()))
       return MemOpCosts + Entry->Cost;
   } else {
     assert(Opcode == Instruction::Store &&

llvm/test/Analysis/CostModel/X86/interleaved-load-f64-stride-6.ll

 ; SSE2: LV: Found an estimated cost of 36 for VF 4 For instruction:   %v0 = load double, double* %in0, align 8
 ;
 ; AVX1: LV: Found an estimated cost of 1 for VF 1 For instruction:   %v0 = load double, double* %in0, align 8
 ; AVX1: LV: Found an estimated cost of 21 for VF 2 For instruction:   %v0 = load double, double* %in0, align 8
 ; AVX1: LV: Found an estimated cost of 48 for VF 4 For instruction:   %v0 = load double, double* %in0, align 8
 ; AVX1: LV: Found an estimated cost of 96 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 21 for VF 2 For instruction:   %v0 = load double, double* %in0, align 8
+; AVX2: LV: Found an estimated cost of 9 for VF 2 For instruction:   %v0 = load double, double* %in0, align 8
 ; AVX2: LV: Found an estimated cost of 48 for VF 4 For instruction:   %v0 = load double, double* %in0, align 8
 ; AVX2: LV: Found an estimated cost of 96 for VF 8 For instruction:   %v0 = load double, double* %in0, align 8
 ;
 ; AVX512: LV: Found an estimated cost of 1 for VF 1 For instruction:   %v0 = load double, double* %in0, align 8
 ; AVX512: LV: Found an estimated cost of 11 for VF 2 For instruction:   %v0 = load double, double* %in0, align 8
 ; AVX512: LV: Found an estimated cost of 21 for VF 4 For instruction:   %v0 = load double, double* %in0, align 8
 ; AVX512: LV: Found an estimated cost of 51 for VF 8 For instruction:   %v0 = load double, double* %in0, align 8
 ; AVX512: LV: Found an estimated cost of 120 for VF 16 For instruction:   %v0 = load double, double* %in0, align 8

llvm/test/Analysis/CostModel/X86/interleaved-load-i64-stride-6.ll

 ; SSE2: LV: Found an estimated cost of 84 for VF 4 For instruction:   %v0 = load i64, i64* %in0, align 8
 ;
 ; AVX1: LV: Found an estimated cost of 1 for VF 1 For instruction:   %v0 = load i64, i64* %in0, align 8
 ; AVX1: LV: Found an estimated cost of 33 for VF 2 For instruction:   %v0 = load i64, i64* %in0, align 8
 ; AVX1: LV: Found an estimated cost of 78 for VF 4 For instruction:   %v0 = load i64, i64* %in0, align 8
 ; AVX1: LV: Found an estimated cost of 156 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 33 for VF 2 For instruction:   %v0 = load i64, i64* %in0, align 8
+; AVX2: LV: Found an estimated cost of 9 for VF 2 For instruction:   %v0 = load i64, i64* %in0, align 8
 ; AVX2: LV: Found an estimated cost of 78 for VF 4 For instruction:   %v0 = load i64, i64* %in0, align 8
 ; AVX2: LV: Found an estimated cost of 156 for VF 8 For instruction:   %v0 = load i64, i64* %in0, align 8
 ;
 ; AVX512: LV: Found an estimated cost of 1 for VF 1 For instruction:   %v0 = load i64, i64* %in0, align 8
 ; AVX512: LV: Found an estimated cost of 11 for VF 2 For instruction:   %v0 = load i64, i64* %in0, align 8
 ; AVX512: LV: Found an estimated cost of 21 for VF 4 For instruction:   %v0 = load i64, i64* %in0, align 8
 ; AVX512: LV: Found an estimated cost of 51 for VF 8 For instruction:   %v0 = load i64, i64* %in0, align 8
 ; AVX512: LV: Found an estimated cost of 120 for VF 16 For instruction:   %v0 = load i64, i64* %in0, align 8

llvm/test/Analysis/CostModel/X86/interleaved-store-f64-stride-6.ll

 ; SSE2: LV: Found an estimated cost of 40 for VF 4 For instruction:   store double %v5, double* %out5, align 8
 ;
 ; AVX1: LV: Found an estimated cost of 1 for VF 1 For instruction:   store double %v5, double* %out5, align 8
 ; AVX1: LV: Found an estimated cost of 21 for VF 2 For instruction:   store double %v5, double* %out5, align 8
 ; AVX1: LV: Found an estimated cost of 54 for VF 4 For instruction:   store double %v5, double* %out5, align 8
 ; AVX1: LV: Found an estimated cost of 108 for VF 8 For instruction:   store double %v5, double* %out5, align 8
 ;
 ; AVX2: LV: Found an estimated cost of 1 for VF 1 For instruction:   store double %v5, double* %out5, align 8
-; AVX2: LV: Found an estimated cost of 21 for VF 2 For instruction:   store double %v5, double* %out5, align 8
+; AVX2: LV: Found an estimated cost of 11 for VF 2 For instruction:   store double %v5, double* %out5, align 8
 ; AVX2: LV: Found an estimated cost of 54 for VF 4 For instruction:   store double %v5, double* %out5, align 8
 ; AVX2: LV: Found an estimated cost of 108 for VF 8 For instruction:   store double %v5, double* %out5, align 8
 ;
 ; AVX512: LV: Found an estimated cost of 1 for VF 1 For instruction:   store double %v5, double* %out5, align 8
 ; AVX512: LV: Found an estimated cost of 17 for VF 2 For instruction:   store double %v5, double* %out5, align 8
 ; AVX512: LV: Found an estimated cost of 25 for VF 4 For instruction:   store double %v5, double* %out5, align 8
 ; AVX512: LV: Found an estimated cost of 51 for VF 8 For instruction:   store double %v5, double* %out5, align 8
 ; AVX512: LV: Found an estimated cost of 102 for VF 16 For instruction:   store double %v5, double* %out5, align 8

llvm/test/Analysis/CostModel/X86/interleaved-store-i64-stride-6.ll

 ; SSE2: LV: Found an estimated cost of 88 for VF 4 For instruction:   store i64 %v5, i64* %out5, align 8
 ;
 ; AVX1: LV: Found an estimated cost of 1 for VF 1 For instruction:   store i64 %v5, i64* %out5, align 8
 ; AVX1: LV: Found an estimated cost of 33 for VF 2 For instruction:   store i64 %v5, i64* %out5, align 8
 ; AVX1: LV: Found an estimated cost of 78 for VF 4 For instruction:   store i64 %v5, i64* %out5, align 8
 ; AVX1: LV: Found an estimated cost of 156 for VF 8 For instruction:   store i64 %v5, i64* %out5, align 8
 ;
 ; AVX2: LV: Found an estimated cost of 1 for VF 1 For instruction:   store i64 %v5, i64* %out5, align 8
-; AVX2: LV: Found an estimated cost of 33 for VF 2 For instruction:   store i64 %v5, i64* %out5, align 8
+; AVX2: LV: Found an estimated cost of 11 for VF 2 For instruction:   store i64 %v5, i64* %out5, align 8
 ; AVX2: LV: Found an estimated cost of 78 for VF 4 For instruction:   store i64 %v5, i64* %out5, align 8
 ; AVX2: LV: Found an estimated cost of 156 for VF 8 For instruction:   store i64 %v5, i64* %out5, align 8
 ;
 ; AVX512: LV: Found an estimated cost of 1 for VF 1 For instruction:   store i64 %v5, i64* %out5, align 8
 ; AVX512: LV: Found an estimated cost of 17 for VF 2 For instruction:   store i64 %v5, i64* %out5, align 8
 ; AVX512: LV: Found an estimated cost of 25 for VF 4 For instruction:   store i64 %v5, i64* %out5, align 8
 ; AVX512: LV: Found an estimated cost of 51 for VF 8 For instruction:   store i64 %v5, i64* %out5, align 8
 ; AVX512: LV: Found an estimated cost of 102 for VF 16 For instruction:   store i64 %v5, i64* %out5, align 8