On Thursday, August 4, 2016 at 12:40:41 AM UTC+8, Hotei wrote:
>
> Looking at the asm it appears that there is a conversion func called in
> the second version - right before the copy with memmove.
>
> Based on this I'd say what happens AFTER the conversion is the same in
> both version since the destination is the same and the content is the same.
> The only optimization I see is not doing an unnecessary explicit
> conversion. I'm not sure this helps. Am I answering the right question?
>
I am still not clear about your answer, yes or not?
>
> On Wednesday, August 3, 2016 at 11:27:36 AM UTC-4, T L wrote:
>>
>>
>> I know a string value can be used as []byte if the first parameter if the
>> builtin copy/append function is a []byte value:
>>
>>> var bs []byte = make([]byte, 10)
>>> copy(bs, "abcde")
>>
>>
>> but if do explicit conversion anyway on the second string value
>>
>>> var bs []byte = make([]byte, 10)
>>> copy(bs, []byte("abcde"))
>>>
>> will compiler do optimization here to avoid copying the underline byte
>> array of the string?
>>
>>
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