[llvm-dev] [RFC] Disabling DAG combines in /O0
Krzysztof Parzyszek via llvm-dev
llvm-dev at lists.llvm.org
Tue May 17 06:25:13 PDT 2016
On 5/16/2016 8:36 PM, Quentin Colombet via llvm-dev wrote:
> DAG combiner does indeed optimizations but also canonicalization.
This has been discussed before and AFAIR, the problem is that the exact
handshakes between combining and legalization are not documented. A
specification of the canonical forms during various stages of
legalization would make it much easier to decouple canonicalization from
Also, do we know that the required canonicalization will not have the
same problem as the combining? That is, whether the necessary
canonicalization steps will not affect the "debuggability" of the program?
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