jcdav.is

Jackson Davis

An unhealthy obsession with micro-optimizations. How the JVM compares your strings using the craziest x86 instruction you've never heard of. We’ve all probably seen Java’s String comparison function before. It compares strings by the first differing character, falling back to the length difference when they are identical up to the end of the shorter string: public int compareTo(String anotherString) { int len1 = value.length; int len2 = anotherString.value.length; int lim. Lets say we wanted to add a val...

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Jackson Davis | jcdav.is Reviews

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An unhealthy obsession with micro-optimizations. How the JVM compares your strings using the craziest x86 instruction you've never heard of. We’ve all probably seen Java’s String comparison function before. It compares strings by the first differing character, falling back to the length difference when they are identical up to the end of the shorter string: public int compareTo(String anotherString) { int len1 = value.length; int len2 = anotherString.value.length; int lim. Lets say we wanted to add a val...

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Jackson Davis | jcdav.is Reviews

https://jcdav.is

An unhealthy obsession with micro-optimizations. How the JVM compares your strings using the craziest x86 instruction you've never heard of. We’ve all probably seen Java’s String comparison function before. It compares strings by the first differing character, falling back to the length difference when they are identical up to the end of the shorter string: public int compareTo(String anotherString) { int len1 = value.length; int len2 = anotherString.value.length; int lim. Lets say we wanted to add a val...

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About · Jackson Davis

http://www.jcdav.is/about

An unhealthy obsession with micro-optimizations. I’m an always curious software developver in San Francisco. I’m particularly interested in working on making computers, and people, work faster and more efficiently. I can be reached via email at my first name at this domain.

2

Allocation on the JVM: Down the rabbit hole · Jackson Davis

http://www.jcdav.is/2016/07/11/JVM-allocation-secrets

An unhealthy obsession with micro-optimizations. Allocation on the JVM: Down the rabbit hole. Lets say we have a simple function that allocates an object:. How much memory does this function allocate per call? The number may vary based on the version of your JVM, the hardware, and various settings, but on recent versions of OpenJDK on x86-64 it’ll be 24 bytes (probably). Now some more experienced readers will remember a feature of the Hotspot known as. Method} {0x00007f7c99001680} demo (JJ)J in Test.

3

Virtually free - JVM callsite optimization by example · Jackson Davis

http://www.jcdav.is/2015/12/14/Virtually-Free

An unhealthy obsession with micro-optimizations. Virtually free - JVM callsite optimization by example. Recently, this post. By Swift creator Chris Lattner has been making the rounds, which does a nice job of detailing method dispatch in various languages. I thought I would add some color on how the Hotspot JIT can safely turn a virtual call into a static one. Let say we have a simple class. And implements its own. Now we’ll create a method that calls. And then give that method a workout:. This only work...

4

Fun C Micro-optimizations - restrict · Jackson Davis

http://www.jcdav.is/2015/11/23/Fun-C-Micro-optimizations-restrict

An unhealthy obsession with micro-optimizations. Fun C Micro-optimizations - restrict. Lets say we wanted to add a value to an every element of an array. Here’s a slightly contrived example:. If we look at the assembly for. Gcc -O1 -S file. There is an interesting peculiarity:. This Inner Loop Header: Depth=1. We are rereading the value of. Every iteration, instead of just once. Why is that? Well, gcc has to assume that its possible that. Overlap, making a write to. Change the value of. 10, 14, 13}.

5

How the JVM compares your strings using the craziest x86 instruction you've never heard of · Jackson Davis

http://www.jcdav.is/2016/09/01/How-the-JVM-compares-your-strings

An unhealthy obsession with micro-optimizations. How the JVM compares your strings using the craziest x86 instruction you've never heard of. We’ve all probably seen Java’s String comparison function before. It compares strings by the first differing character, falling back to the length difference when they are identical up to the end of the shorter string:. But did you know there is also a secret second implementation? Method} compare (Ljava/lang/String;Ljava/lang/String;)I in Test. Is a member of the.

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Jackson Davis

An unhealthy obsession with micro-optimizations. How the JVM compares your strings using the craziest x86 instruction you've never heard of. We’ve all probably seen Java’s String comparison function before. It compares strings by the first differing character, falling back to the length difference when they are identical up to the end of the shorter string: public int compareTo(String anotherString) { int len1 = value.length; int len2 = anotherString.value.length; int lim. Lets say we wanted to add a val...

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