[LLVMdev] embedded metadata

[Nick Lewycky]

I have a quick question about embedded metadata. I've lost track of 
exactly what we want to support.

What about making MDNodes that refer to Instructions? Is that desired 
any more, or is that obsolete? I had a patch to do this locally and I 
either want to fix it up and commit it or discard it.

The relevant section of my locally modified 
test/Feature/embeddedmetadata.ll reads:

define void @foo() {
   ;; Intrinsic using MDNode and MDString
   %x = call i8 @llvm.something(metadata !21, i32 42, metadata !"bar")
   %y = call i8 @llvm.something(
       metadata !{i8 %x, i8 %y, i32 %z, metadata* @llvm.foo, null,
       i32* null, metadata undef, metadata !{i8 %y, metadata !"foo"}, 
metadata !"foo"})
   %z = add i32 1, 1
   ret void
}

where %y is a new instruction demonstrating the MDNode's ability to 
refer to other instructions.

Nick