[llvm-dev] Adding assembly instructions to LLVM

[Joerg Sonnenberger via llvm-dev]

On Sun, Oct 30, 2016 at 04:33:08PM -0500, soroosh khoram via llvm-dev wrote:
> I've been reading the documents and the source code for several days now
> and I feel kind of lost right now. I was hoping someone here could point me
> to the right direction.

The expansion for add on x86 starts in
lib/Targets/X86/X86InstrArithmethic.td, line 1197 (defm ADD) and
involves somewhat complicated multiclassing to deal with various operand
combinations. A better starting point is likely the "test" family, line
1223ff.

Joerg