[PATCH] D110755: [X86][Costmodel] Load/store i32/f32 Stride=2 VF=8 interleaving costs

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
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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/n8aMKeo4E - for intels `Block RThroughput: =4.0`; for ryzens, `Block RThroughput: <=2.0`
So pick cost of `4`.

For store we have:
https://godbolt.org/z/n8aMKeo4E - for intels `Block RThroughput: =4.0`; for ryzens, `Block RThroughput: =2.0`
So pick cost of `4`.

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


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110755

Files:
  llvm/lib/Target/X86/X86TargetTransformInfo.cpp
  llvm/test/Analysis/CostModel/X86/interleaved-load-i32-stride-2.ll
  llvm/test/Analysis/CostModel/X86/interleaved-store-i32-stride-2.ll


Index: llvm/test/Analysis/CostModel/X86/interleaved-store-i32-stride-2.ll
===================================================================
--- llvm/test/Analysis/CostModel/X86/interleaved-store-i32-stride-2.ll
+++ llvm/test/Analysis/CostModel/X86/interleaved-store-i32-stride-2.ll
@@ -28,7 +28,7 @@
 ; AVX2: LV: Found an estimated cost of 1 for VF 1 For instruction:   store i32 %v1, i32* %out1, align 4
 ; AVX2: LV: Found an estimated cost of 2 for VF 2 For instruction:   store i32 %v1, i32* %out1, align 4
 ; AVX2: LV: Found an estimated cost of 3 for VF 4 For instruction:   store i32 %v1, i32* %out1, align 4
-; AVX2: LV: Found an estimated cost of 46 for VF 8 For instruction:   store i32 %v1, i32* %out1, align 4
+; AVX2: LV: Found an estimated cost of 6 for VF 8 For instruction:   store i32 %v1, i32* %out1, align 4
 ; AVX2: LV: Found an estimated cost of 92 for VF 16 For instruction:   store i32 %v1, i32* %out1, align 4
 ; AVX2: LV: Found an estimated cost of 184 for VF 32 For instruction:   store i32 %v1, i32* %out1, align 4
 ;
Index: llvm/test/Analysis/CostModel/X86/interleaved-load-i32-stride-2.ll
===================================================================
--- llvm/test/Analysis/CostModel/X86/interleaved-load-i32-stride-2.ll
+++ llvm/test/Analysis/CostModel/X86/interleaved-load-i32-stride-2.ll
@@ -28,7 +28,7 @@
 ; AVX2: LV: Found an estimated cost of 1 for VF 1 For instruction:   %v0 = load i32, i32* %in0, align 4
 ; AVX2: LV: Found an estimated cost of 3 for VF 2 For instruction:   %v0 = load i32, i32* %in0, align 4
 ; AVX2: LV: Found an estimated cost of 3 for VF 4 For instruction:   %v0 = load i32, i32* %in0, align 4
-; AVX2: LV: Found an estimated cost of 46 for VF 8 For instruction:   %v0 = load i32, i32* %in0, align 4
+; AVX2: LV: Found an estimated cost of 6 for VF 8 For instruction:   %v0 = load i32, i32* %in0, align 4
 ; AVX2: LV: Found an estimated cost of 92 for VF 16 For instruction:   %v0 = load i32, i32* %in0, align 4
 ; AVX2: LV: Found an estimated cost of 184 for VF 32 For instruction:   %v0 = load i32, i32* %in0, align 4
 ;
Index: llvm/lib/Target/X86/X86TargetTransformInfo.cpp
===================================================================
--- llvm/lib/Target/X86/X86TargetTransformInfo.cpp
+++ llvm/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -5077,6 +5077,7 @@
 
       {2, MVT::v2i32, 2}, // (load 4i32 and) deinterleave into 2 x 2i32
       {2, MVT::v4i32, 2}, // (load 8i32 and) deinterleave into 2 x 4i32
+      {2, MVT::v8i32, 4}, // (load 16i32 and) deinterleave into 2 x 8i32
 
       {2, MVT::v4i64, 6}, // (load 8i64 and) deinterleave into 2 x 4i64
 
@@ -5123,6 +5124,7 @@
 
       {2, MVT::v2i32, 1}, // interleave 2 x 2i32 into 4i32 (and store)
       {2, MVT::v4i32, 2}, // interleave 2 x 4i32 into 8i32 (and store)
+      {2, MVT::v8i32, 4}, // interleave 2 x 8i32 into 16i32 (and store)
 
       {2, MVT::v4i64, 6}, // interleave 2 x 4i64 into 8i64 (and store)
 


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