ok
On Thursday, April 7, 2016 at 1:48:50 PM UTC-4, Yichao Yu wrote:
>
>
>
> On Thu, Apr 7, 2016 at 1:14 PM, Jeffrey Sarnoff <jeffrey...@gmail.com
> <javascript:>> wrote:
>
>> thanks for the coverage Tamas; I did not check v0.4. from
>>
>> Julia Version 0.5.0-dev+3313 Commit 5e01b1a (2016-03-29 15:14 UTC)
>> System:
>> Windows (x86_64-w64-mingw32) CPU: Intel(R) Core(TM) i7-4960X CPU @
>> 3.60GHz
>>
>> Empty blocks, the ultimate in code compression. With v0.5.0-dev, used as
>> he wrote, they do not behave as `pass`; they show up (llvm --> Intel) as
>> opcode ud2 (Undefined/Invalid):
>>
>
> There may be bugs but it is likely fixed on master. If not, please report
> a bug.
>
>>
>>
>> f_nothing(x) = nothing ;
>> f_emptyblock(x) = begin end ;
>> from code_llvm: f_nothing(Int32) { return void };
>> f_emptyblock(Int32){ unreachable } ;
>> from code_native: f_nothing(Int32) { push move pop return };
>> f_emptyblock(Int32){ push move ud2 } ;
>>
>>
>>
>> UD2--Undefined Instruction
>> OpcodeInstructionDescription
>>
>> 0F 0B
>>
>> UD2
>>
>> Raise invalid opcode exception
>> Description
>>
>> Generates an invalid opcode. This instruction is provided for software
>> testing to explicitly generate an invalid opcode. The opcode for this
>> instruction is reserved for this purpose.
>>
>> Other than raising the invalid opcode exception, this instruction is the
>> same as the NOP instruction.
>> Operation
>>
>> #UD (* Generates invalid opcode exception *);
>> Flags Affected
>>
>> None.
>> Exceptions (All Operating Modes)
>>
>> #UD - Instruction is guaranteed to raise an invalid opcode exception in
>> all operating modes.
>>
>>
>>
>> On Thursday, April 7, 2016 at 7:29:18 AM UTC-4, Tamas Papp wrote:
>>>
>>> Thanks, I always forget that empty blocks return nothing.
>>>
>>> Best,
>>>
>>> Tamas
>>>
>>> On Thu, Apr 07 2016, Mauro wrote:
>>>
>>> > Use:
>>> >
>>> > foo(x) = nothing
>>> >
>>> > Note, you're suggestion also returns `nothing`.
>>> >
>>> > On Thu, 2016-04-07 at 13:04, Tamas Papp <tkp...@gmail.com> wrote:
>>> >> Hi,
>>> >>
>>> >> What's the most compact form of writing a function in assignment form
>>> >> with an empty body? Eg is
>>> >>
>>> >> foo(x) = begin end
>>> >>
>>> >> the shortest?
>>> >>
>>> >> (context: I am using a local function for iterating over a collection
>>> in
>>> >> a function. for a particular set of argument types, it does nothing,
>>> >> hence the need. I am aware that I could be using Match.jl)
>>> >>
>>> >> Best,
>>> >>
>>> >> Tamas
>>>
>>>
>
