[llvm-dev] InlineAsm and allocation to wrong register for indirect access

[Paulo Matos via llvm-dev]

Hi,

I am seeing a case, in a private port, of an inline asm with indirect
memory references being allocated invalid registers (i.e. registers that
cannot be used on loads).

For example, the inline asm constraint is correct:
call void asm sideeffect "MOV $$r0,  $0\0AMOV $$r0,  $1\0A",
"*m,*m,~{r0}"(i16* @a, i16* %b) #1, !srcloc !1

but then $0 and $1 are allocated to registers that cannot be used as a
memory base pointer.

I am having trouble finding where this decision is made. Is InlineAsm
going through the normal register allocation process or does it have its
own specialized algorithm?

Any pointers to how registers are allocated in an InlineAsm would be
helpful.

Kind regards,

-- 
Paulo Matos