llvm dev - Jun 2016 - type-inference in tblgen for instrinfo

If there is a design document describing the codegen backend to tblgen, and the
type-inference system it uses, I would appreciate a pointer to it.

all I can find online, like "TableGen BackEnds" and "Writing an
LLVM Backend",  don't go into these details, but I seem to need a
deeper understanding,


For example when I add "i32:" to an internal node of pattern tree, for
example  "i32:shl" in
                [(set i32:$dst   (i32:shl   i32:rs1,  i32:rs2))]
Then I get the error "expected variable name in dag operator", and a
source cursor pointing to the "shl"


I am able to jump to all kinds of conclusions about the nature of this
"error", but don't have any hard facts to go by.


--Peter.
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----- Original Message -----
> From: "Peter via llvm-dev Lawrence" <llvm-dev at
lists.llvm.org>
> To: llvm-dev at lists.llvm.org
> Sent: Thursday, June 9, 2016 5:39:42 PM
> Subject: [llvm-dev] type-inference in tblgen for instrinfo
> If there is a design document describing the codegen backend to
> tblgen, and the type-inference system it uses, I would appreciate a
> pointer to it.
> all I can find online, like “TableGen BackEnds” and “Writing an LLVM
> Backend”, don’t go into these details, but I seem to need a deeper
> understanding,
> For example when I add “i32:” to an internal node of pattern tree,
> for example “i32:shl” in
> [(set i32:$dst (i32:shl i32:rs1, i32:rs2))]
> Then I get the error “expected variable name in dag operator”, and a
> source cursor pointing to the “shl”
> I am able to jump to all kinds of conclusions about the nature of
> this “error”, but don’t have any hard facts to go by.
Why are you trying to add a type there? 

-Hal 
> --Peter.
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
-- 

Hal Finkel 
Assistant Computational Scientist 
Leadership Computing Facility 
Argonne National Laboratory 
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