Inline assembler in D and LDC, round 2

[Don]

Walter Bright wrote:
> Frits van Bommel wrote:
>> His approach depends on DMD directly emitting x86 machine code, so it 
>> can just emit 'RET' and be done with it.
>>
>> LDC on the other hand needs to emit LLVM asm, which requires it to 
>> specify an explicit return value. My approach is a way to extract that 
>> return value from the inline asm, allowing it to emulate DMD behavior 
>> within the LLVM IR.
> 
> Ok, so why not, for a function that returns an int, simply have the 
> compiler silently tack on the LLVM equivalent of "return EAX"?

I've created bugzilla 2648 for one of the issues -- struct returns are a 
particular nuisance. (I think you may encounter this on DMD-Mac).