[Issue 19198] New: Transfer the entire development DMD to LLVM: WebAssembly, dynamic scripting..

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19198

          Issue ID: 19198
           Summary: Transfer the entire development DMD to LLVM:
                    WebAssembly, dynamic scripting..
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: black80 at bk.ru

I am noob of LLVM.

1) LLVM allow use any subset of Analytic and Transfer Passes
https://releases.llvm.org/6.0.0/docs/Passes.html
GCC(DMD backend?) is blackbox, LLVM - white box where u can
insert/delete/update any Passes for any hardware.

2) LLVM can generate WebAssembly code - big frontend area, probably server too. 
translation LLVM-IR to WASM can be used from any opensource team: LLVM, Rust,
Go... U don't need waste time for it.

3) LDC already supports dynamic compilation for some functions. 
Team can add runtime scripts do D in future. 
see Terra language with Lua integration. 
yep, Lua is scripting and Terra is script inside Lua. 
Lua has one runtime(LUA), Terra has another runtime(LLVM) - they should
cooperate and this step adds more complications inside RT. 
D-LLVM-scripts can work in one runtime and GC. 
at this PDF author of Terra says about lang and optimizations
https://cs.stanford.edu/~zdevito/zdevito_thesis.pdf. Look at chapter 5 where 50
lines of Terra code can compared by speed with thousands LOC of BLAS and MKL -
libs that solve linear system of equations. Such simplicity would not be
available without LLVM.
Runtime scripts are needed in many areas - games, graphic editors (shaders),
REPL/shell, finance (trading/backtesting).. Even Qt/QML has no good interop
between itself. C#/Java has good scripting interop and probably that all.

4) I can't imagine how many bonuses can be with using LLVM. 
search ideas at internet/blogs and known persons from any lang-teams that use
LLVM. union of LLVM and D can add features to both areas: D-team can improve
LLVM passes/code/lib and people that worked LLVM can add incredible
possibilities to D-lang/runtime

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