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rvgo: experimental no-alloc noescape merkle funcs #88

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rvgo: experimental no-alloc noescape merkle funcs #88

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@protolambda protolambda commented Oct 16, 2024 •
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Description

A little bit hacky. And makes the assumption there's only 1 concurrent hasher (this could be fixed by allocating a keccakState per Memory merkleization job, and passing it as typed function argument through the merkle functions).

  • Share hasher, so hasher doesn't get re-allocated every hash call
  • Tricks with go:noescape and go:linkname to force it to not assume the function interface, and not allow any slice data to escape to the heap

This essentially removes all the non-essential allocations from the merkleization work, in a bit of an unsafe non-recommended way, to see how much performance can improve with this kind of heap-analysis informed memory optimization.

Profiles of the benchmark show that it's only a little bit faster, even after removing a theorectical ~10 million object allocations.

Before:
before

After:
after

CPU:
Before:

cpu: AMD Ryzen 9 5950X 16-Core Processor            
BenchmarkMemoryOperations
BenchmarkMemoryOperations/RandomReadWrite_Small
BenchmarkMemoryOperations/RandomReadWrite_Small-32         	48573948	        23.16 ns/op
BenchmarkMemoryOperations/RandomReadWrite_Medium
BenchmarkMemoryOperations/RandomReadWrite_Medium-32        	   12456	    126946 ns/op
BenchmarkMemoryOperations/RandomReadWrite_Large
BenchmarkMemoryOperations/RandomReadWrite_Large-32         	    9952	    112717 ns/op
BenchmarkMemoryOperations/SequentialReadWrite_Small
BenchmarkMemoryOperations/SequentialReadWrite_Small-32     	231982236	         5.219 ns/op
BenchmarkMemoryOperations/SequentialReadWrite_Large
BenchmarkMemoryOperations/SequentialReadWrite_Large-32     	222372898	         5.442 ns/op
BenchmarkMemoryOperations/SparseMemoryUsage
BenchmarkMemoryOperations/SparseMemoryUsage-32             	  528241	      2216 ns/op
BenchmarkMemoryOperations/DenseMemoryUsage
BenchmarkMemoryOperations/DenseMemoryUsage-32              	141923272	         8.803 ns/op
BenchmarkMemoryOperations/SmallFrequentUpdates
BenchmarkMemoryOperations/SmallFrequentUpdates-32          	36277586	        32.13 ns/op
BenchmarkMemoryOperations/MerkleProofGeneration_Small
BenchmarkMemoryOperations/MerkleProofGeneration_Small-32   	  655786	      1573 ns/op
BenchmarkMemoryOperations/MerkleProofGeneration_Large
BenchmarkMemoryOperations/MerkleProofGeneration_Large-32   	  561040	      1985 ns/op
BenchmarkMemoryOperations/MerkleRootCalculation_Small
BenchmarkMemoryOperations/MerkleRootCalculation_Small-32   	224840816	         5.409 ns/op
BenchmarkMemoryOperations/MerkleRootCalculation_Large
BenchmarkMemoryOperations/MerkleRootCalculation_Large-32   	205111311	         5.721 ns/op
PASS

After:

cpu: AMD Ryzen 9 5950X 16-Core Processor            
BenchmarkMemoryOperations
BenchmarkMemoryOperations/RandomReadWrite_Small
BenchmarkMemoryOperations/RandomReadWrite_Small-32         	51766090	        21.48 ns/op
BenchmarkMemoryOperations/RandomReadWrite_Medium
BenchmarkMemoryOperations/RandomReadWrite_Medium-32        	   12172	    130552 ns/op
BenchmarkMemoryOperations/RandomReadWrite_Large
BenchmarkMemoryOperations/RandomReadWrite_Large-32         	   10000	    113670 ns/op
BenchmarkMemoryOperations/SequentialReadWrite_Small
BenchmarkMemoryOperations/SequentialReadWrite_Small-32     	223583344	         4.971 ns/op
BenchmarkMemoryOperations/SequentialReadWrite_Large
BenchmarkMemoryOperations/SequentialReadWrite_Large-32     	232579297	         5.322 ns/op
BenchmarkMemoryOperations/SparseMemoryUsage
BenchmarkMemoryOperations/SparseMemoryUsage-32             	  423361	      2386 ns/op
BenchmarkMemoryOperations/DenseMemoryUsage
BenchmarkMemoryOperations/DenseMemoryUsage-32              	145170620	         8.592 ns/op
BenchmarkMemoryOperations/SmallFrequentUpdates
BenchmarkMemoryOperations/SmallFrequentUpdates-32          	36379844	        30.87 ns/op
BenchmarkMemoryOperations/MerkleProofGeneration_Small
BenchmarkMemoryOperations/MerkleProofGeneration_Small-32   	  702778	      1490 ns/op
BenchmarkMemoryOperations/MerkleProofGeneration_Large
BenchmarkMemoryOperations/MerkleProofGeneration_Large-32   	  555963	      1900 ns/op
BenchmarkMemoryOperations/MerkleRootCalculation_Small
BenchmarkMemoryOperations/MerkleRootCalculation_Small-32   	233706420	         5.124 ns/op
BenchmarkMemoryOperations/MerkleRootCalculation_Large
BenchmarkMemoryOperations/MerkleRootCalculation_Large-32   	218443596	         5.557 ns/op
PASS

Heap-escape:

./keccakfast.go:17:6: cannot inline keccakReset: no function body
./keccakfast.go:21:6: cannot inline keccakWrite: no function body
./keccakfast.go:25:6: cannot inline keccakRead: no function body
./keccakfast.go:30:6: cannot inline hashPair: function too complex: cost 259 exceeds budget 80
./keccakfast.go:38:6: cannot inline hash: function too complex: cost 193 exceeds budget 80
./keccakfast.go:28:68: inlining call to sha3.NewLegacyKeccak256
./keccakfast.go:28:68: Before inlining: 
.   CALLFUNC hash.Hash tc(1) # keccakfast.go:28:68
./keccakfast.go:28:68: After inlining 
.   .   AS2 Def tc(1) # keccakfast.go:28:68
.   .   INLMARK # +keccakfast.go:28:68
.   INLCALL hash.Hash tc(1) # keccakfast.go:28:68
.   .   BLOCK tc(1) # keccakfast.go:28:68
.   .   .   DCL tc(1) # keccakfast.go:28:68
.   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:27
.   .   .   AS2 tc(1) # keccakfast.go:28:68
.   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:27
.   .   .   .   CONVIFACE Implicit hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   .   .   PTRLIT PTR-*sha3.state tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   .   .   .   STRUCTLIT sha3.state tc(1) # keccakfast.go:28:68 hashes.go:71:52
.   .   .   .   .   .   .   STRUCTKEY sha3.rate # keccakfast.go:28:68 hashes.go:71:53
.   .   .   .   .   .   .   .   LITERAL-136 int tc(1) # keccakfast.go:28:68 hashes.go:71:59
.   .   .   .   .   .   .   STRUCTKEY sha3.outputLen # keccakfast.go:28:68 hashes.go:71:64
.   .   .   .   .   .   .   .   LITERAL-32 int tc(1) # keccakfast.go:28:68 hashes.go:71:75
.   .   .   .   .   .   .   STRUCTKEY sha3.dsbyte # keccakfast.go:28:68 hashes.go:71:79
.   .   .   .   .   .   .   .   LITERAL-1 byte tc(1) # keccakfast.go:28:68 hashes.go:71:87
.   .   .   .   .   ADDR PTR-*uint8 tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   .   .   ADDR PTR-*uint8 tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   GOTO fast..i0 tc(1) # keccakfast.go:28:68
.   .   LABEL fast..i0 # keccakfast.go:28:68
.   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:27
./keccakfast.go:28:44: inlining call to reflect.ValueOf
./keccakfast.go:28:44: Before inlining: 
.   CALLFUNC reflect.Value tc(1) # keccakfast.go:28:44
.   .   CONVIFACE Implicit any tc(1) # keccakfast.go:28:68
.   .   .   PAREN hash.Hash tc(1) # keccakfast.go:28:68
.   .   .   .   .   AS2 Def tc(1) # keccakfast.go:28:68
.   .   .   .   .   INLMARK # +keccakfast.go:28:68
.   .   .   .   INLCALL hash.Hash tc(1) # keccakfast.go:28:68
.   .   .   .   .   BLOCK tc(1) # keccakfast.go:28:68
.   .   .   .   .   .   DCL tc(1) # keccakfast.go:28:68
.   .   .   .   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:27
.   .   .   .   .   .   AS2 tc(1) # keccakfast.go:28:68
.   .   .   .   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:27
.   .   .   .   .   .   .   CONVIFACE Implicit hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   .   .   .   .   .   PTRLIT PTR-*sha3.state tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   .   .   .   .   .   .   STRUCTLIT sha3.state tc(1) # keccakfast.go:28:68 hashes.go:71:52
.   .   .   .   .   .   .   .   .   .   STRUCTKEY sha3.rate # keccakfast.go:28:68 hashes.go:71:53
.   .   .   .   .   .   .   .   .   .   .   LITERAL-136 int tc(1) # keccakfast.go:28:68 hashes.go:71:59
.   .   .   .   .   .   .   .   .   .   STRUCTKEY sha3.outputLen # keccakfast.go:28:68 hashes.go:71:64
.   .   .   .   .   .   .   .   .   .   .   LITERAL-32 int tc(1) # keccakfast.go:28:68 hashes.go:71:75
.   .   .   .   .   .   .   .   .   .   STRUCTKEY sha3.dsbyte # keccakfast.go:28:68 hashes.go:71:79
.   .   .   .   .   .   .   .   .   .   .   LITERAL-1 byte tc(1) # keccakfast.go:28:68 hashes.go:71:87
.   .   .   .   .   .   .   .   ADDR PTR-*uint8 tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   .   .   .   .   .   ADDR PTR-*uint8 tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   .   .   .   GOTO fast..i0 tc(1) # keccakfast.go:28:68
.   .   .   .   .   LABEL fast..i0 # keccakfast.go:28:68
.   .   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:27
./keccakfast.go:28:44: After inlining 
.   .   .   DCL # keccakfast.go:28:44
.   .   .   .   NAME-reflect.i Class:PAUTO Offset:0 InlFormal OnStack Used any tc(1) # keccakfast.go:28:44 value.go:3262:14
.   .   AS2 Def tc(1) # keccakfast.go:28:44
.   .   .   NAME-reflect.i Class:PAUTO Offset:0 InlFormal OnStack Used any tc(1) # keccakfast.go:28:44 value.go:3262:14
.   .   .   CONVIFACE Implicit any tc(1) # keccakfast.go:28:68
.   .   .   .   PAREN hash.Hash tc(1) # keccakfast.go:28:68
.   .   .   .   .   .   AS2 Def tc(1) # keccakfast.go:28:68
.   .   .   .   .   .   INLMARK # +keccakfast.go:28:68
.   .   .   .   .   INLCALL hash.Hash tc(1) # keccakfast.go:28:68
.   .   .   .   .   .   BLOCK tc(1) # keccakfast.go:28:68
.   .   .   .   .   .   .   DCL tc(1) # keccakfast.go:28:68
.   .   .   .   .   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:27
.   .   .   .   .   .   .   AS2 tc(1) # keccakfast.go:28:68
.   .   .   .   .   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:27
.   .   .   .   .   .   .   .   CONVIFACE Implicit hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   .   .   .   .   .   .   PTRLIT PTR-*sha3.state tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   .   .   .   .   .   .   .   STRUCTLIT sha3.state tc(1) # keccakfast.go:28:68 hashes.go:71:52
.   .   .   .   .   .   .   .   .   .   .   STRUCTKEY sha3.rate # keccakfast.go:28:68 hashes.go:71:53
.   .   .   .   .   .   .   .   .   .   .   .   LITERAL-136 int tc(1) # keccakfast.go:28:68 hashes.go:71:59
.   .   .   .   .   .   .   .   .   .   .   STRUCTKEY sha3.outputLen # keccakfast.go:28:68 hashes.go:71:64
.   .   .   .   .   .   .   .   .   .   .   .   LITERAL-32 int tc(1) # keccakfast.go:28:68 hashes.go:71:75
.   .   .   .   .   .   .   .   .   .   .   STRUCTKEY sha3.dsbyte # keccakfast.go:28:68 hashes.go:71:79
.   .   .   .   .   .   .   .   .   .   .   .   LITERAL-1 byte tc(1) # keccakfast.go:28:68 hashes.go:71:87
.   .   .   .   .   .   .   .   .   ADDR PTR-*uint8 tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   .   .   .   .   .   .   ADDR PTR-*uint8 tc(1) # keccakfast.go:28:68 hashes.go:71:46
.   .   .   .   .   .   .   GOTO fast..i0 tc(1) # keccakfast.go:28:68
.   .   .   .   .   .   LABEL fast..i0 # keccakfast.go:28:68
.   .   .   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack hash.Hash tc(1) # keccakfast.go:28:68 hashes.go:71:27
.   .   DCL # keccakfast.go:28:44
.   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack reflect.Value tc(1) # keccakfast.go:28:44 value.go:3262:21
.   .   AS tc(1) # keccakfast.go:28:44
.   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack reflect.Value tc(1) # keccakfast.go:28:44 value.go:3262:21
.   .   INLMARK Index:1 # +keccakfast.go:28:44
.   INLCALL reflect.Value tc(1) # keccakfast.go:28:44
.   .   IF tc(1) # keccakfast.go:28:44 value.go:3263:2
.   .   .   EQ bool tc(1) # keccakfast.go:28:44 value.go:3263:7
.   .   .   .   NAME-reflect.i Class:PAUTO Offset:0 InlFormal OnStack Used any tc(1) # keccakfast.go:28:44 value.go:3262:14
.   .   .   .   NIL any tc(1) # keccakfast.go:28:44 value.go:3263:10
.   .   .   BLOCK tc(1) # keccakfast.go:28:44
.   .   .   .   AS2 tc(1) # keccakfast.go:28:44
.   .   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack reflect.Value tc(1) # keccakfast.go:28:44 value.go:3262:21
.   .   .   .   .   STRUCTLIT reflect.Value tc(1) # keccakfast.go:28:44 value.go:3264:15
.   .   .   .   GOTO fast..i1 tc(1) # keccakfast.go:28:44
.   .   BLOCK tc(1) # keccakfast.go:28:44
.   .   .   AS2 tc(1) # keccakfast.go:28:44
.   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack reflect.Value tc(1) # keccakfast.go:28:44 value.go:3262:21
.   .   .   .   CALLFUNC reflect.Value tc(1) # keccakfast.go:28:44 value.go:3266:20
.   .   .   .   .   NAME-reflect.i Class:PAUTO Offset:0 InlFormal OnStack Used any tc(1) # keccakfast.go:28:44 value.go:3262:14
.   .   .   GOTO fast..i1 tc(1) # keccakfast.go:28:44
.   .   LABEL fast..i1 # keccakfast.go:28:44
.   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack reflect.Value tc(1) # keccakfast.go:28:44 value.go:3262:21
./keccakfast.go:28:44: inlining call to reflect.unpackEface
./keccakfast.go:28:44: Before inlining: 
.   CALLFUNC reflect.Value tc(1) # keccakfast.go:28:44 value.go:3266:20
.   .   NAME-reflect.i Class:PAUTO Offset:0 InlFormal OnStack Used any tc(1) # keccakfast.go:28:44 value.go:3262:14
./keccakfast.go:28:44: After inlining 
.   .   .   DCL # keccakfast.go:28:44 value.go:3266:20
.   .   .   .   NAME-reflect.i Class:PAUTO Offset:0 Addrtaken InlFormal OnStack Used any tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:154:18
.   .   AS2 Def tc(1) # keccakfast.go:28:44 value.go:3266:20
.   .   .   NAME-reflect.i Class:PAUTO Offset:0 Addrtaken InlFormal OnStack Used any tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:154:18
.   .   .   NAME-reflect.i Class:PAUTO Offset:0 InlFormal OnStack Used any tc(1) # keccakfast.go:28:44 value.go:3262:14
.   .   DCL # keccakfast.go:28:44 value.go:3266:20
.   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack reflect.Value tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:154:25
.   .   AS tc(1) # keccakfast.go:28:44 value.go:3266:20
.   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack reflect.Value tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:154:25
.   .   INLMARK Index:2 # +keccakfast.go:28:44 value.go:3266:20
.   INLCALL reflect.Value tc(1) # keccakfast.go:28:44 value.go:3266:20
.   .   .   DCL # keccakfast.go:28:44 value.go:3266:20 value.go:155:2
.   .   .   .   NAME-reflect.e Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.EmptyInterface tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:155:2
.   .   AS Def tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:155:4
.   .   .   NAME-reflect.e Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.EmptyInterface tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:155:2
.   .   .   CONVNOP PTR-*abi.EmptyInterface tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:155:43
.   .   .   .   CONVNOP UNSAFEPTR-unsafe.Pointer tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:155:44
.   .   .   .   .   ADDR PTR-*any tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:155:44
.   .   .   .   .   .   NAME-reflect.i Class:PAUTO Offset:0 Addrtaken InlFormal OnStack Used any tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:154:18
.   .   .   DCL # keccakfast.go:28:44 value.go:3266:20 value.go:157:2
.   .   .   .   NAME-reflect.t Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:2
.   .   AS Def tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:4
.   .   .   NAME-reflect.t Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:2
.   .   .   DOTPTR fast.Type PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:8
.   .   .   .   NAME-reflect.e Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.EmptyInterface tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:155:2
.   .   IF tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:158:2
.   .   .   EQ bool tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:158:7
.   .   .   .   NAME-reflect.t Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:2
.   .   .   .   NIL PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:158:10
.   .   .   BLOCK tc(1) # keccakfast.go:28:44 value.go:3266:20
.   .   .   .   AS2 tc(1) # keccakfast.go:28:44 value.go:3266:20
.   .   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack reflect.Value tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:154:25
.   .   .   .   .   STRUCTLIT reflect.Value tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:159:15
.   .   .   .   GOTO fast..i2 tc(1) # keccakfast.go:28:44 value.go:3266:20
.   .   .   DCL # keccakfast.go:28:44 value.go:3266:20 value.go:161:2
.   .   .   .   NAME-reflect.f Class:PAUTO Offset:0 InlLocal OnStack Used reflect.flag tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:2
.   .   AS Def tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:4
.   .   .   NAME-reflect.f Class:PAUTO Offset:0 InlLocal OnStack Used reflect.flag tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:2
.   .   .   CONV reflect.flag tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   .   .   .   CALLFUNC abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   .   .   .   .   METHEXPR fast.Kind FUNC-func(*abi.Type) abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:13
.   .   .   .   .   NAME-reflect.t Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:2
.   .   IF tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:2
.   .   .   CALLFUNC bool tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17
.   .   .   .   METHEXPR fast.IfaceIndir FUNC-func(*abi.Type) bool tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:6
.   .   .   .   NAME-reflect.t Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:2
.   .   .   ASOP-OR AsOp:OR tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:163:5
.   .   .   .   NAME-reflect.f Class:PAUTO Offset:0 InlLocal OnStack Used reflect.flag tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:2
.   .   .   .   LITERAL-128 reflect.flag tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:163:8
.   .   BLOCK tc(1) # keccakfast.go:28:44 value.go:3266:20
.   .   .   AS2 tc(1) # keccakfast.go:28:44 value.go:3266:20
.   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack reflect.Value tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:154:25
.   .   .   .   STRUCTLIT reflect.Value tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:165:14
.   .   .   .   .   STRUCTKEY reflect.typ_ # keccakfast.go:28:44 value.go:3266:20 value.go:165:15
.   .   .   .   .   .   NAME-reflect.t Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:2
.   .   .   .   .   STRUCTKEY reflect.ptr # keccakfast.go:28:44 value.go:3266:20 value.go:165:19
.   .   .   .   .   .   DOTPTR fast.Data UNSAFEPTR-unsafe.Pointer tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:165:19
.   .   .   .   .   .   .   NAME-reflect.e Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.EmptyInterface tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:155:2
.   .   .   .   .   STRUCTKEY reflect.flag # keccakfast.go:28:44 value.go:3266:20 value.go:165:26
.   .   .   .   .   .   NAME-reflect.f Class:PAUTO Offset:0 InlLocal OnStack Used reflect.flag tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:2
.   .   .   GOTO fast..i2 tc(1) # keccakfast.go:28:44 value.go:3266:20
.   .   LABEL fast..i2 # keccakfast.go:28:44 value.go:3266:20
.   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack reflect.Value tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:154:25
./keccakfast.go:28:44: inlining call to abi.(*Type).Kind
./keccakfast.go:28:44: Before inlining: 
.   CALLFUNC abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   .   METHEXPR fast.Kind FUNC-func(*abi.Type) abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:13
.   .   NAME-reflect.t Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:2
./keccakfast.go:28:44: After inlining 
.   .   .   DCL # keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   .   .   .   NAME-abi.t Class:PAUTO Offset:0 InlFormal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18 type.go:189:7
.   .   AS2 Def tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   .   .   NAME-abi.t Class:PAUTO Offset:0 InlFormal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18 type.go:189:7
.   .   .   NAME-reflect.t Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:2
.   .   INLMARK Index:3 # +keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   INLCALL abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   .   BLOCK tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   .   .   DCL tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18 type.go:189:23
.   .   .   AS2 tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18 type.go:189:23
.   .   .   .   AND abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18 type.go:189:45
.   .   .   .   .   DOTPTR fast.Kind_ abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18 type.go:189:38
.   .   .   .   .   .   NAME-abi.t Class:PAUTO Offset:0 InlFormal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18 type.go:189:7
.   .   .   .   .   LITERAL-31 abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18 type.go:189:47
.   .   .   GOTO fast..i3 tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   .   LABEL fast..i3 # keccakfast.go:28:44 value.go:3266:20 value.go:161:18
.   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:161:18 type.go:189:23
./keccakfast.go:28:44: inlining call to abi.(*Type).IfaceIndir
./keccakfast.go:28:44: Before inlining: 
.   CALLFUNC bool tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17
.   .   METHEXPR fast.IfaceIndir FUNC-func(*abi.Type) bool tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:6
.   .   NAME-reflect.t Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:2
./keccakfast.go:28:44: After inlining 
.   .   .   DCL # keccakfast.go:28:44 value.go:3266:20 value.go:162:17
.   .   .   .   NAME-abi.t Class:PAUTO Offset:0 InlFormal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17 type.go:199:7
.   .   AS2 Def tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17
.   .   .   NAME-abi.t Class:PAUTO Offset:0 InlFormal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17 type.go:199:7
.   .   .   NAME-reflect.t Class:PAUTO Offset:0 InlLocal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:157:2
.   .   INLMARK Index:4 # +keccakfast.go:28:44 value.go:3266:20 value.go:162:17
.   INLCALL bool tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17
.   .   BLOCK tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17
.   .   .   DCL tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17
.   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack bool tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17 type.go:199:29
.   .   .   AS2 tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17
.   .   .   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack bool tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17 type.go:199:29
.   .   .   .   EQ bool tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17 type.go:200:33
.   .   .   .   .   AND abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17 type.go:200:16
.   .   .   .   .   .   DOTPTR fast.Kind_ abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17 type.go:200:10
.   .   .   .   .   .   .   NAME-abi.t Class:PAUTO Offset:0 InlFormal OnStack Used PTR-*abi.Type tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17 type.go:199:7
.   .   .   .   .   .   LITERAL-32 abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17 type.go:200:17
.   .   .   .   .   LITERAL-0 abi.Kind tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17 type.go:200:36
.   .   .   GOTO fast..i4 tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17
.   .   LABEL fast..i4 # keccakfast.go:28:44 value.go:3266:20 value.go:162:17
.   .   NAME-fast.~r0 Class:PAUTO Offset:0 InlFormal OnStack bool tc(1) # keccakfast.go:28:44 value.go:3266:20 value.go:162:17 type.go:199:29
./keccakfast.go:17:18: st does not escape
./keccakfast.go:21:18: st does not escape
./keccakfast.go:21:35: p does not escape
./keccakfast.go:25:17: st does not escape
./keccakfast.go:25:34: out does not escape
./keccakfast.go:31:13:[1] hashPair stmt: keccakReset(hasher)
./keccakfast.go:32:7:[1] hashPair stmt: _, _ = int(.autotmp_3), .autotmp_4
./keccakfast.go:32:7:[1] hashPair stmt: .autotmp_3, .autotmp_4 := keccakWrite(hasher, left[:])
./keccakfast.go:32:7:[1] hashPair stmt: var .autotmp_3 int
./keccakfast.go:32:7:[1] hashPair stmt: var .autotmp_4 error
./keccakfast.go:33:7:[1] hashPair stmt: _, _ = int(.autotmp_5), .autotmp_6
./keccakfast.go:33:7:[1] hashPair stmt: .autotmp_5, .autotmp_6 := keccakWrite(hasher, right[:])
./keccakfast.go:33:7:[1] hashPair stmt: var .autotmp_5 int
./keccakfast.go:33:7:[1] hashPair stmt: var .autotmp_6 error
./keccakfast.go:34:7:[1] hashPair stmt: _, _ = int(.autotmp_7), .autotmp_8
./keccakfast.go:34:7:[1] hashPair stmt: .autotmp_7, .autotmp_8 := keccakRead(hasher, out[:])
./keccakfast.go:34:7:[1] hashPair stmt: var .autotmp_7 int
./keccakfast.go:34:7:[1] hashPair stmt: var .autotmp_8 error
./keccakfast.go:35:2:[1] hashPair stmt: return 
./keccakfast.go:28:5:[1] init stmt: hasher = (*keccakState)(reflect.Value.UnsafePointer(~r0))
./keccakfast.go:28:44:[1] init stmt: reflect.i := ~r0
./keccakfast.go:28:44:[1] init stmt: var reflect.i any
./keccakfast.go:28:68:[1] init stmt:  := 
./keccakfast.go:28:68:[1] init stmt: <node inlmark>
./keccakfast.go:28:68:[1] init stmt: var ~r0 hash.Hash; ~r0 = &sha3.state{...}; goto .i0
./keccakfast.go:28:68:[1] init stmt: var ~r0 hash.Hash
./keccakfast.go:28:68:[1] init stmt: ~r0 = &sha3.state{...}
./keccakfast.go:28:68:[1] init stmt: goto .i0
./keccakfast.go:28:68:[1] init stmt: .i0: 
./keccakfast.go:28:68:.i0:  non-looping label
./keccakfast.go:28:44:[1] init stmt: var ~r0 reflect.Value
./keccakfast.go:28:44:[1] init stmt: ~r0 = <nil>
./keccakfast.go:28:44:[1] init stmt: <node inlmark>
./keccakfast.go:28:44:[1] init stmt: if reflect.i == nil { ~r0 = reflect.Value{}; goto .i1 }
./keccakfast.go:28:44:[1] init stmt: ~r0 = reflect.Value{}; goto .i1
./keccakfast.go:28:44:[1] init stmt: ~r0 = reflect.Value{}
./keccakfast.go:28:44:[1] init stmt: goto .i1
./keccakfast.go:28:44:[1] init stmt: ~r0 = ~r0; goto .i1
./keccakfast.go:28:44:[1] init stmt: ~r0 = ~r0
./keccakfast.go:28:44:[1] init stmt: reflect.i := reflect.i
./keccakfast.go:28:44:[1] init stmt: var reflect.i any
./keccakfast.go:28:44:[1] init stmt: var ~r0 reflect.Value
./keccakfast.go:28:44:[1] init stmt: ~r0 = <nil>
./keccakfast.go:28:44:[1] init stmt: <node inlmark>
./keccakfast.go:28:44:[1] init stmt: reflect.e := (*abi.EmptyInterface)(unsafe.Pointer(&reflect.i))
./keccakfast.go:28:44:[1] init stmt: var reflect.e *abi.EmptyInterface
./keccakfast.go:28:44:[1] init stmt: reflect.t := reflect.e.Type
./keccakfast.go:28:44:[1] init stmt: var reflect.t *abi.Type
./keccakfast.go:28:44:[1] init stmt: if reflect.t == nil { ~r0 = reflect.Value{}; goto .i2 }
./keccakfast.go:28:44:[1] init stmt: ~r0 = reflect.Value{}; goto .i2
./keccakfast.go:28:44:[1] init stmt: ~r0 = reflect.Value{}
./keccakfast.go:28:44:[1] init stmt: goto .i2
./keccakfast.go:28:44:[1] init stmt: reflect.f := reflect.flag(~r0)
./keccakfast.go:28:44:[1] init stmt: var reflect.f reflect.flag
./keccakfast.go:28:44:[1] init stmt: abi.t := reflect.t
./keccakfast.go:28:44:[1] init stmt: var abi.t *abi.Type
./keccakfast.go:28:44:[1] init stmt: <node inlmark>
./keccakfast.go:28:44:[1] init stmt: var ~r0 abi.Kind; ~r0 = abi.t.Kind_ & abi.Kind(31); goto .i3
./keccakfast.go:28:44:[1] init stmt: var ~r0 abi.Kind
./keccakfast.go:28:44:[1] init stmt: ~r0 = abi.t.Kind_ & abi.Kind(31)
./keccakfast.go:28:44:[1] init stmt: goto .i3
./keccakfast.go:28:44:[1] init stmt: .i3: 
./keccakfast.go:28:44:.i3:  non-looping label
./keccakfast.go:28:44:[1] init stmt: if ~r0 { reflect.f |= reflect.flag(128) }
./keccakfast.go:28:44:[1] init stmt: abi.t := reflect.t
./keccakfast.go:28:44:[1] init stmt: var abi.t *abi.Type
./keccakfast.go:28:44:[1] init stmt: <node inlmark>
./keccakfast.go:28:44:[1] init stmt: var ~r0 bool; ~r0 = abi.t.Kind_ & abi.Kind(32) == abi.Kind(0); goto .i4
./keccakfast.go:28:44:[1] init stmt: var ~r0 bool
./keccakfast.go:28:44:[1] init stmt: ~r0 = abi.t.Kind_ & abi.Kind(32) == abi.Kind(0)
./keccakfast.go:28:44:[1] init stmt: goto .i4
./keccakfast.go:28:44:[1] init stmt: .i4: 
./keccakfast.go:28:44:.i4:  non-looping label
./keccakfast.go:28:44:[1] init stmt: reflect.f |= reflect.flag(128)
./keccakfast.go:28:44:[1] init stmt: ~r0 = reflect.Value{...}; goto .i2
./keccakfast.go:28:44:[1] init stmt: ~r0 = reflect.Value{...}
./keccakfast.go:28:44:[1] init stmt: goto .i2
./keccakfast.go:28:44:[1] init stmt: .i2: 
./keccakfast.go:28:44:.i2:  non-looping label
./keccakfast.go:28:44:[1] init stmt: goto .i1
./keccakfast.go:28:44:[1] init stmt: .i1: 
./keccakfast.go:28:44:.i1:  non-looping label
./keccakfast.go:28:68: &sha3.state{...} escapes to heap:
./keccakfast.go:28:68:   flow: ~r0 = &{storage for &sha3.state{...}}:
./keccakfast.go:28:68:     from &sha3.state{...} (spill) at ./keccakfast.go:28:68
./keccakfast.go:28:68:     from &sha3.state{...} (interface-converted) at ./keccakfast.go:28:68
./keccakfast.go:28:68:     from ~r0 = &sha3.state{...} (assign-pair) at ./keccakfast.go:28:68
./keccakfast.go:28:68:   flow: reflect.i = ~r0:
./keccakfast.go:28:68:     from ~r0 (interface-converted) at ./keccakfast.go:28:68
./keccakfast.go:28:68:     from reflect.i := ~r0 (assign-pair) at ./keccakfast.go:28:44
./keccakfast.go:28:68:   flow: reflect.i = reflect.i:
./keccakfast.go:28:68:     from reflect.i := reflect.i (assign-pair) at ./keccakfast.go:28:44
./keccakfast.go:28:68:   flow: reflect.e = &reflect.i:
./keccakfast.go:28:68:     from &reflect.i (address-of) at ./keccakfast.go:28:44
./keccakfast.go:28:68:     from reflect.e := (*abi.EmptyInterface)(unsafe.Pointer(&reflect.i)) (assign) at ./keccakfast.go:28:44
./keccakfast.go:28:68:   flow: ~r0 = *reflect.e:
./keccakfast.go:28:68:     from reflect.e.Data (dot of pointer) at ./keccakfast.go:28:44
./keccakfast.go:28:68:     from reflect.Value{...} (struct literal element) at ./keccakfast.go:28:44
./keccakfast.go:28:68:     from ~r0 = reflect.Value{...} (assign-pair) at ./keccakfast.go:28:44
./keccakfast.go:28:68:   flow: ~r0 = ~r0:
./keccakfast.go:28:68:     from ~r0 = ~r0 (assign-pair) at ./keccakfast.go:28:44
./keccakfast.go:28:68:   flow: {heap} = ~r0:
./keccakfast.go:28:68:     from reflect.Value.UnsafePointer(~r0) (call parameter) at ./keccakfast.go:28:85
./keccakfast.go:28:68:     from hasher = (*keccakState)(reflect.Value.UnsafePointer(~r0)) (assign) at ./keccakfast.go:28:5
./keccakfast.go:28:68: &sha3.state{...} escapes to heap
./keccakfast.go:39:13:[1] hash stmt: keccakReset(hasher)
./keccakfast.go:40:7:[1] hash stmt: _, _ = int(.autotmp_2), .autotmp_3
./keccakfast.go:40:7:[1] hash stmt: .autotmp_2, .autotmp_3 := keccakWrite(hasher, data[:])
./keccakfast.go:40:7:[1] hash stmt: var .autotmp_2 int
./keccakfast.go:40:7:[1] hash stmt: var .autotmp_3 error
./keccakfast.go:41:7:[1] hash stmt: _, _ = int(.autotmp_4), .autotmp_5
./keccakfast.go:41:7:[1] hash stmt: .autotmp_4, .autotmp_5 := keccakRead(hasher, out[:])
./keccakfast.go:41:7:[1] hash stmt: var .autotmp_4 int
./keccakfast.go:41:7:[1] hash stmt: var .autotmp_5 error
./keccakfast.go:42:2:[1] hash stmt: return

Thought I'd share this little experiment and the results.

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@protolambda