[llvm] 45caac9 - [X86][Costmodel] Load/store i16 Stride=4 VF=2 interleaving costs

[Roman Lebedev via llvm-commits]

Author: Roman Lebedev
Date: 2021-09-27T22:20:01+03:00
New Revision: 45caac91c4e0caf64ec933f35c4a2d86a3fa31e3

URL: https://github.com/llvm/llvm-project/commit/45caac91c4e0caf64ec933f35c4a2d86a3fa31e3
DIFF: https://github.com/llvm/llvm-project/commit/45caac91c4e0caf64ec933f35c4a2d86a3fa31e3.diff

LOG: [X86][Costmodel] Load/store i16 Stride=4 VF=2 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/5EYc6r9nh - for intels `Block RThroughput: =6.0`; for ryzens, `Block RThroughput: <=3.0`
So pick cost of `6`.

For store we have:
https://godbolt.org/z/z61e5d6GE - for intels `Block RThroughput: =2.0`; for ryzens, `Block RThroughput: <=1.0`
So pick cost of `2`.

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/D110536

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86TargetTransformInfo.cpp
    llvm/test/Analysis/CostModel/X86/interleaved-load-i16-stride-4.ll
    llvm/test/Analysis/CostModel/X86/interleaved-store-i16-stride-4.ll

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
index 3abf2320ecca..8cdfceb44d51 100644
--- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
+++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -5085,6 +5085,8 @@ InstructionCost X86TTIImpl::getInterleavedMemoryOpCostAVX2(
       {4, MVT::v16i8, 39}, // (load 64i8 and) deinterleave into 4 x 16i8
       {4, MVT::v32i8, 80}, // (load 128i8 and) deinterleave into 4 x 32i8
 
+      {4, MVT::v2i16, 6}, // (load 8i16 and) deinterleave into 4 x 2i16
+
       {8, MVT::v8i32, 40} // (load 64i32 and) deinterleave into 8 x 8i32
   };
 
@@ -5107,7 +5109,9 @@ InstructionCost X86TTIImpl::getInterleavedMemoryOpCostAVX2(
       {4, MVT::v4i8, 9},   // interleave 4 x 4i8 into 16i8 (and store)
       {4, MVT::v8i8, 10},  // interleave 4 x 8i8 into 32i8 (and store)
       {4, MVT::v16i8, 10}, // interleave 4 x 16i8 into 64i8 (and store)
-      {4, MVT::v32i8, 12}  // interleave 4 x 32i8 into 128i8 (and store)
+      {4, MVT::v32i8, 12}, // interleave 4 x 32i8 into 128i8 (and store)
+
+      {4, MVT::v2i16, 2},  // interleave 4 x 2i16 into 8i16 (and store)
   };
 
   if (Opcode == Instruction::Load) {

diff  --git a/llvm/test/Analysis/CostModel/X86/interleaved-load-i16-stride-4.ll b/llvm/test/Analysis/CostModel/X86/interleaved-load-i16-stride-4.ll
index a1682dcf7c50..363ba0a5808c 100644
--- a/llvm/test/Analysis/CostModel/X86/interleaved-load-i16-stride-4.ll
+++ b/llvm/test/Analysis/CostModel/X86/interleaved-load-i16-stride-4.ll
@@ -9,7 +9,7 @@ target triple = "x86_64-unknown-linux-gnu"
 
 ; CHECK: LV: Checking a loop in "test"
 ; 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 17 for VF 2 For instruction:   %v0 = load i16, i16* %in0, align 2
+; CHECK: LV: Found an estimated cost of 7 for VF 2 For instruction:   %v0 = load i16, i16* %in0, align 2
 ; CHECK: LV: Found an estimated cost of 41 for VF 4 For instruction:   %v0 = load i16, i16* %in0, align 2
 ; CHECK: LV: Found an estimated cost of 82 for VF 8 For instruction:   %v0 = load i16, i16* %in0, align 2
 ; CHECK: LV: Found an estimated cost of 228 for VF 16 For instruction:   %v0 = load i16, i16* %in0, align 2

diff  --git a/llvm/test/Analysis/CostModel/X86/interleaved-store-i16-stride-4.ll b/llvm/test/Analysis/CostModel/X86/interleaved-store-i16-stride-4.ll
index fa04acf7b820..e0aaf683029d 100644
--- a/llvm/test/Analysis/CostModel/X86/interleaved-store-i16-stride-4.ll
+++ b/llvm/test/Analysis/CostModel/X86/interleaved-store-i16-stride-4.ll
@@ -9,7 +9,7 @@ target triple = "x86_64-unknown-linux-gnu"
 
 ; CHECK: LV: Checking a loop in "test"
 ; CHECK: LV: Found an estimated cost of 1 for VF 1 For instruction:   store i16 %v3, i16* %out3, align 2
-; CHECK: LV: Found an estimated cost of 17 for VF 2 For instruction:   store i16 %v3, i16* %out3, align 2
+; CHECK: LV: Found an estimated cost of 3 for VF 2 For instruction:   store i16 %v3, i16* %out3, align 2
 ; CHECK: LV: Found an estimated cost of 49 for VF 4 For instruction:   store i16 %v3, i16* %out3, align 2
 ; CHECK: LV: Found an estimated cost of 98 for VF 8 For instruction:   store i16 %v3, i16* %out3, align 2
 ; CHECK: LV: Found an estimated cost of 228 for VF 16 For instruction:   store i16 %v3, i16* %out3, align 2