<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">This idea sounds pretty cool</div><div class="">Just some quick comments inlined below:<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Mar 23, 2019, at 1:57 PM, preejackie via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div bgcolor="#FFFFFF" text="#000000" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Hi all,
</span></font></div><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">
</span></font></p><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">I would like to propose "Speculative compilation support in ORC v2 JIT API" for this year GSoC summer project.</span></font></div><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">
</span></font></p><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Project Description: </span></font></div><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class=""> </span><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Speculative compilation support. One of the selling points of the concurrent ORC APIs is that you can start compiling a function before you need it, in the hope that by the time that you do need it it is already compiled. However, if we just speculatively compile everything we're quickly going to overload our memory/CPU resources, which will be lousy for performance. What we really want to do is to take into account any information we have (from high level program representations, e.g. ASTs or CFGs, or from profiling data from previous executions) to try to guess what functions are worth speculatively compiling next. </span></font></div>
<font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Idea is proposed by Lang Hames.</span></font><font face="Courier New, Courier, monospace" class=""><br class="">
</font><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">
</span></font></p><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Current Status of ORC v2: </span></font></div>
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<li dir="ltr" style="list-style-type: decimal; font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre; margin-left: 36pt;" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">ORC currently supports concurrent compilation and Lazy (on request compilation), trunk contains default new ORC JIT implementations as LLJIT, LLLazyJIT. </span></font></div></li>
<li dir="ltr" style="list-style-type: decimal; font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre; margin-left: 36pt;" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">[WIP] Jit-linker a drop-in-replacement for RuntimeDyld atleast for MachO in ORC JIT.</span></font></div></li>
<li dir="ltr" style="list-style-type: decimal; font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre; margin-left: 36pt;" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Primitive code to handle speculative is in trunk. But it needs to refactored & designed to get generalized, simple APIs to support speculation.</span></font></div></li>
<li dir="ltr" style="list-style-type: decimal; font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre; margin-left: 36pt;" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Currently, no heuristics to support speculation in trunk.</span></font></div></li>
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</font><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Proposed Solution: </span></font></div>
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<li dir="ltr" style="list-style-type: decimal; font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre; margin-left: 36pt;" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">New APIs in ORC v2 to support speculation compilation of LLVM bitcode. LLSpecJIT - subtype of LLJIT, default JIT with speculation support in trunk. </span></font></div></li>
<li dir="ltr" style="list-style-type: decimal; font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre; margin-left: 36pt;" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Heuristics to guide speculation - </span></font></div></li>
</ol><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt; margin-left: 108pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Currently, I’m going through some literature/research papers to find good basic heuristics. We can derive useful information from Control flow graphs, IR etc. So far I figured out that </span><span style="font-size: 12pt; background-color: transparent; font-weight: 700; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Region-based compilation </span><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">is more appropriate for speculation. </span></font></div></div></div></blockquote><div><br class=""></div><div>Can you justify your point? What do you mean by saying “appropriate”? Is it easy to implement or have better performance on the generated code?</div><div><br class=""></div><div>Just a FYI:</div><div>The JIT compilation community has been debating over which compilation region should be chosen for quite some time.</div><div>The TL;DR answer is: there is NO single answer, all depends on the usages and engineering efforts. </div><div>Just give you examples on two of the most adopted methods: trace-based(kind of similar to region based) and function-based.</div><div>Famous users of trace-based JIT are early versions of SpiderMonkey(i.e. JS engine in Firefox) and Dalvik VM(i.e. the old VM in Android). This approach can record hot path across functions, and just like the old saying: global optimizations are always preferred. However, it requires more engineering efforts and profiling/tracing is almost mandatory.</div><div>Function-based JIT is used by V8 and ART(Android Runtime, the current VM in Android), to name a few. The biggest advantage is that it’s pretty easy to implement. And the performance is actually not bad in most of the cases. The downside is , of course, it will loose some global optimization opportunities. </div><div><br class=""></div><div>Be honestly I’m pretty surprised you didn’t mention any of the above projects. Of course, none of them use LLVM, but all of them are outstanding JIT engines with huge amount of users and tested by time. Some of them are even important milestones in the history of dynamic compilation. I believe you can learn the key insight of choosing a specific compilation region from them.</div><br class=""><blockquote type="cite" class=""><div class=""><div bgcolor="#FFFFFF" text="#000000" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt; margin-left: 108pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Since, unit of compilation (granularity) is key good dynamic compilation, region based compilation address that by forming frequently executed code as a region (unit), this can be basic block, function or group of functions. But since, LLVM JIT API needs interoperates with static compiler, unit of compilation here is a complete module. </span></font></div></div></div></blockquote><br class=""><blockquote type="cite" class=""><div class=""><div bgcolor="#FFFFFF" text="#000000" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt; margin-left: 108pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">The plan in mind is to break the module into regions and compile regions speculatively using multiple JIT backend light weight threads. I’m still not sure, how this can be done, I would highly appreciate the feedback from community in deciding the heuristics & granularity to compile.</span></font></div><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class=""> </span><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class=""> </span><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">3.Practical example with benchmarks: To my best of knowledge PostgreSQL using ORC API, it would be easier to get postgresql queries to get compile speculatively and compare results with baseline (concurrent compiler without speculation).</span></font></div><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class=""> </span><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class=""> </span><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">4. Unit tests + documentation.</span></font></div>
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</font><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Benefits:</span><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class=""> </span></font></div>
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<li dir="ltr" style="list-style-type: decimal; font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre; margin-left: 72pt;" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">We can full use of multiple compilation threads, to compile code upfront with minimum false positive. </span></font></div></li>
<li dir="ltr" style="list-style-type: decimal; font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre; margin-left: 72pt;" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Stabilize JIT APIs which most clients looking for when transitioning to newer versions.</span></font></div></li>
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</font><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Further Opportunities : </span></font></div><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">We can also use thinlto summaries in module to decide which code is worthier to compile next, based on this lighting </span><a href="https://www.youtube.com/watch?v=ZCnHxRhQmvs" style="text-decoration:none;" class=""><span style="font-size: 12pt; color: rgb(17, 85, 204); background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;" class="">LLVM Dev talk by Stefan</span></a><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">. </span></font></div><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Profile guided optimization - information will be helpful in this, provide further room for improvement.</span></font></div><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class=""> </span></font></p><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">I would highly appreciate the community feedback & suggestions :)
</span></font></div><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">I will try my best to address all the comments in the proposal. I'm currently familiarizing myself with new APIs and learning heuristics. I will try to get the draft proposal by next week.</span></font></div><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">
</span></font></p><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">References: HHVM JIT: A profile-Guided, Region-Based Compiler for PHP & Hack [<a moz-do-not-send="true" href="https://dl.acm.org/citation.cfm?id=3192374" class="">paper</a>].</span></font></div><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">PostgreSQL [<a moz-do-not-send="true" href="https://doxygen.postgresql.org/structLLVMJitHandle.html" class="">JIT</a>]
</span></font></div><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">Execution Engine [<a moz-do-not-send="true" href="https://reviews.llvm.org/diffusion/L/browse/llvm/trunk/lib/ExecutionEngine/Orc/" class="">ORC</a>]
</span></font></div><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class=""></span></font></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;" class=""><font face="Courier New, Courier, monospace" class=""><span style="font-size: 12pt; background-color: transparent; font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;" class="">
</span></font></p></div></div></blockquote><div><br class=""></div><div>Best,</div><div>Bekket</div><br class=""><blockquote type="cite" class=""><div class=""><div bgcolor="#FFFFFF" text="#000000" class="">
<font face="Courier New, Courier, monospace" class=""></font>
<pre class="moz-signature" cols="72"><font face="Courier New, Courier, monospace" class="">--
Have a great day!
PreeJackie</font></pre>
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