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core/vm: optimize copy-less data retrievals

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This commit is contained in:
Péter Szilágyi
2017-08-14 17:08:49 +03:00
parent d8aaa3a215
commit f8d8b56b28
4 changed files with 75 additions and 54 deletions
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16
core/vm/common.go
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@ -34,7 +34,21 @@ func calcMemSize(off, l *big.Int) *big.Int {
// getData returns a slice from the data based on the start and size and pads
// up to size with zero's. This function is overflow safe.
func getData(data []byte, start, size *big.Int) []byte {
func getData(data []byte, start uint64, size uint64) []byte {
length := uint64(len(data))
if start > length {
start = length
}
end := start + size
if end > length {
end = length
}
return common.RightPadBytes(data[start:end], int(size))
}
// getDataBig returns a slice from the data based on the start and size and pads
// up to size with zero's. This function is overflow safe.
func getDataBig(data []byte, start *big.Int, size *big.Int) []byte {
dlen := big.NewInt(int64(len(data)))
s := math.BigMin(start, dlen)