[llvm] bac60c5 - [X86][Costmodel] Load/store i8 Stride=2 VF=16 interleaving costs

[Roman Lebedev via llvm-commits]

Author: Roman Lebedev
Date: 2021-09-29T21:52:45+03:00
New Revision: bac60c55e0ff88f0f61ffed330374699216e1329

URL: https://github.com/llvm/llvm-project/commit/bac60c55e0ff88f0f61ffed330374699216e1329
DIFF: https://github.com/llvm/llvm-project/commit/bac60c55e0ff88f0f61ffed330374699216e1329.diff

LOG: [X86][Costmodel] Load/store i8 Stride=2 VF=16 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/a9hv4z47v - 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/6GfPn1b79 - 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/D110708

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86TargetTransformInfo.cpp
    llvm/test/Analysis/CostModel/X86/interleaved-load-i8-stride-2.ll
    llvm/test/Analysis/CostModel/X86/interleaved-store-i8-stride-2.ll

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
index de1ccc0b5c1b..cceb0aaf28bc 100644
--- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
+++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -5066,6 +5066,7 @@ InstructionCost X86TTIImpl::getInterleavedMemoryOpCostAVX2(
       {2, MVT::v2i8, 2},  // (load 4i8 and) deinterleave into 2 x 2i8
       {2, MVT::v4i8, 2},  // (load 8i8 and) deinterleave into 2 x 4i8
       {2, MVT::v8i8, 2},  // (load 16i8 and) deinterleave into 2 x 8i8
+      {2, MVT::v16i8, 4},  // (load 32i8 and) deinterleave into 2 x 16i8
 
       {2, MVT::v2i16, 2}, // (load 4i16 and) deinterleave into 2 x 2i16
       {2, MVT::v4i16, 2}, // (load 8i16 and) deinterleave into 2 x 4i16
@@ -5107,6 +5108,7 @@ InstructionCost X86TTIImpl::getInterleavedMemoryOpCostAVX2(
       {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)
 
       {2, MVT::v2i16, 1}, // interleave 2 x 2i16 into 4i16 (and store)
       {2, MVT::v4i16, 1}, // interleave 2 x 4i16 into 8i16 (and store)

diff  --git a/llvm/test/Analysis/CostModel/X86/interleaved-load-i8-stride-2.ll b/llvm/test/Analysis/CostModel/X86/interleaved-load-i8-stride-2.ll
index af6df8c95efa..1c61ecdc36e7 100644
--- a/llvm/test/Analysis/CostModel/X86/interleaved-load-i8-stride-2.ll
+++ b/llvm/test/Analysis/CostModel/X86/interleaved-load-i8-stride-2.ll
@@ -29,7 +29,7 @@ target triple = "x86_64-unknown-linux-gnu"
 ; AVX2: LV: Found an estimated cost of 3 for VF 2 For instruction:   %v0 = load i8, i8* %in0, align 1
 ; AVX2: LV: Found an estimated cost of 3 for VF 4 For instruction:   %v0 = load i8, i8* %in0, align 1
 ; AVX2: LV: Found an estimated cost of 3 for VF 8 For instruction:   %v0 = load i8, i8* %in0, align 1
-; AVX2: LV: Found an estimated cost of 81 for VF 16 For instruction:   %v0 = load i8, i8* %in0, align 1
+; AVX2: LV: Found an estimated cost of 5 for VF 16 For instruction:   %v0 = load i8, i8* %in0, align 1
 ; AVX2: LV: Found an estimated cost of 166 for VF 32 For instruction:   %v0 = load i8, i8* %in0, align 1
 ;
 ; AVX512: LV: Found an estimated cost of 1 for VF 1 For instruction:   %v0 = load i8, i8* %in0, align 1

diff  --git a/llvm/test/Analysis/CostModel/X86/interleaved-store-i8-stride-2.ll b/llvm/test/Analysis/CostModel/X86/interleaved-store-i8-stride-2.ll
index 059147329865..d713d30ee36c 100644
--- a/llvm/test/Analysis/CostModel/X86/interleaved-store-i8-stride-2.ll
+++ b/llvm/test/Analysis/CostModel/X86/interleaved-store-i8-stride-2.ll
@@ -29,7 +29,7 @@ target triple = "x86_64-unknown-linux-gnu"
 ; AVX2: LV: Found an estimated cost of 2 for VF 2 For instruction:   store i8 %v1, i8* %out1, align 1
 ; AVX2: LV: Found an estimated cost of 2 for VF 4 For instruction:   store i8 %v1, i8* %out1, align 1
 ; AVX2: LV: Found an estimated cost of 2 for VF 8 For instruction:   store i8 %v1, i8* %out1, align 1
-; AVX2: LV: Found an estimated cost of 67 for VF 16 For instruction:   store i8 %v1, i8* %out1, align 1
+; AVX2: LV: Found an estimated cost of 4 for VF 16 For instruction:   store i8 %v1, i8* %out1, align 1
 ; AVX2: LV: Found an estimated cost of 166 for VF 32 For instruction:   store i8 %v1, i8* %out1, align 1
 ;
 ; AVX512: LV: Found an estimated cost of 1 for VF 1 For instruction:   store i8 %v1, i8* %out1, align 1