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performance improvement

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This commit is contained in:
lmittmann 2024-02-14 19:15:12 +01:00
parent 8a9807da9a
commit ae0edbf0d0
1 changed files with 17 additions and 9 deletions
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24
core/vm/analysis.go
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@ -138,21 +138,29 @@ func (bv bitVec) codeBitVec(code []byte) bitVec {
continue // continue if the OpCode is not PUSH1..32 continue // continue if the OpCode is not PUSH1..32
} }
numBytes := op - 0x5f // number of data bytes pushed numBytes := op - 0x5f // number of data bytes pushed
shift := uint8((pc + 1) % 32)
// set bits
mask := masks[numBytes] // optimization for: (1 << numBytes) - 1
shift := uint8(pc+1) % 32
i := (pc + 1) / 32 i := (pc + 1) / 32
bv[i+1] = mask >> (32 - shift)
bv[i] |= mask << shift
switch numBytes {
case 1:
bv[i] |= 1 << shift
pc += 2
case 32:
a := masks[numBytes] << shift
bv[i] |= uint32(a)
bv[i+1] = uint32(^a)
pc += 33
default:
a := masks[numBytes] << shift
bv[i] |= uint32(a)
bv[i+1] = uint32(a >> 32)
pc += uint64(numBytes + 1) pc += uint64(numBytes + 1)
} }
}
return bv return bv
} }
var masks = [256]uint32{ var masks = [256]uint64{
1: 0b00000000_00000000_00000000_00000001, 1: 0b00000000_00000000_00000000_00000001,
2: 0b00000000_00000000_00000000_00000011, 2: 0b00000000_00000000_00000000_00000011,
3: 0b00000000_00000000_00000000_00000111, 3: 0b00000000_00000000_00000000_00000111,