[LLVMdev] Cannot interchange "literal" and "identified" structs

Justin Holewinski justin.holewinski at gmail.com
Sun Dec 30 05:39:14 PST 2012

With primitive types, I can interchange literal usage and type aliases in

%mytype = type i32

define void @foo(%mytype* %ptr) {
  %t1 = load *%mytype** %ptr
  store i32 *%t1*, *i32** %ptr
  ret void

But for structs, I cannot:

%mytype = type { i32, i32 }

define void @foo(%mytype* %ptr) {
  %t1 = load *%mytype** %ptr
  store* { i32, i32 }* %t1, *{ i32, i32 }** %ptr
  ret void

bin/llvm-as: alias2.ll:6:22: error: '%t1' defined with type '%mytype = type
{ i32, i32 }'
  store { i32, i32 } %t1, { i32, i32 }* %ptr

I don't see anything in the language reference manual that disallows such
usage, as the literal struct type and %mytype are equivalent.  Am I missing
something here, or is this just a bug in the assembly parser?



Justin Holewinski
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