[llvm-dev] SelectionDAG::LegalizeTypes is very slow in 3.1 version

[James Y Knight via llvm-dev]

You realize 3.1 was released **4 years ago**, and that there's been more
than 50,000 commits to llvm since then (not even including commits to clang
and other pieces!), right?


On Tue, Sep 27, 2016 at 2:20 AM, xiaoyong liu via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> In 3.1, the backend is very slow to legalize types.
>
>
> Following is the code snippet which may be the culprit:
>
>   %Result.i.i.i97 = alloca i33, align 8
>   %Result.i.i.i96= alloca i33, align 8
>   %Result.i.i.i95 = alloca i33, align 8
>   %Result.i.i.i94 = alloca i33, align 8
>   %Result.i.i.i93 = alloca i33, align 8
>   %Result.i.i.i92= alloca i33, align 8
>   %Result.i.i.i91 = alloca i33, align 8
>   %Result.i.i.i90 = alloca i33, align 8
>   %Result.i.i.i89 = alloca i33, align 8
>
>
> The compilation time improve significant if running on LLVM 3.9.
> Unfortunately, it's not a choice for me now to upgrade it to 3.9.
>
> If anyone luckily to  know what's the evolution in this area to improve
> the compilation time performance, pls kindly comments.
>
>
> thanks
>
> Xiaoyong
>
>
>
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