decade about graphics and performance programming that’s still relevant to Code Optimization is there too, and even my book Zen of Assembly. Graphics Programming Black Book Special Edition has 65 ratings and 3 reviews. — Includes everything that master Abrash has ever written about optimizati. Michael Abrash’s classic Graphics Programming Black Book is a compilation of Michael’s writings on assembly language and graphics.
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To boost the overall performance of Listing 5. Some compilers can efficiently handle a single far pointer used in a loop by leaving ES set for the duration of the loop.
Graphics Programming Black Book Special Edition
VGA Data Machinery 2. It would be blacj to load the entire file into memory and then sum the bytes in one loop. Aug 29, Woflmao rated it it was amazing.
Consequently, for word-sized memory accesses, the has an effective transfer rate of 1 byte every 0. You could add the two registers together to address memory, like this:.
Kris rated it it was amazing Feb 14, In short, if you must perform a bit memory access, let the break the access into two byte-sized accesses for you. I still remember the video hook story at the beginning of one of the chapters. Queue Processing, Part 1 Java Concurrency: That may sound ridiculously simple, but, as this chapter makes clear, it turns out to be a challenging task indeed, one that at times verges on black magic.
Hacker News new comments show ask jobs submit. The latch-and-read method will grxphics on all PC-compatible computers, but may occasionally produce results that are incorrect by 54 ms. The long-period Zen timer does not, however, have the same potential for introducing major inaccuracy into the system clock time during a single timing run since it leaves interrupts enabled and therefore allows the system clock to update normally.
The remaining chap brings up some old wooden chairs and sets them up to make benches along the sides of the bathroom. Withoutabox Submit to Film Festivals.
Michael Abrash’s Graphics Programming Black Book | Hacker News
Would you like to tell us about a lower price? A Post-Mortem and a Glimpse into the Future 1. On a orhowever, the balance shifts. Interestingly, that toll becomes much higher on ATs and machines because while those computers can execute many more instructions per microsecond than can the based PC, it takes just as long to access display memory on those computers as on the based PC.
When the best code—the fastest or smallest code possible—is needed, though, assembly is the only way to go. Now we have to figure out how to search through a file by loading it into that large buffer in chunks.
This text features assembler optimization for a variety of problems programmong searching algorithms, and records the author’s approaches to optimizing code for the evolving line of Intel CPUs, from the on to the early Pentium lines. Both instructions are 2 bytes long, and in both cases it is the 8-cycle instruction fetch time, not the 3 or 4-cycle Execution Unit execution time, that limits performance.
Still, the flexible mind is no better than the knowledge at its disposal. Occasionally, however, we will need to time longer intervals. Just a moment while we sign you in to your Goodreads account. The key difference between the long-period Zen timer and the precision Zen timer is that the long-period timer leaves interrupts programmnig during the timing period.
C programmers tend to modularize their code with lots of function calls. Due to the nature of these files, we were unable to remove the link. The fact of the matter is that a given instruction takes at least as long to execute as the time given for it in the Intel manuals, but may take as much as 4 cycles per byte longer, depending on the state of the prefetch queue when the preceding instruction ends.
Ignorance about true performance can be costly. You must also learn to look at your programming problems from a variety of perspectives so that you can put those fast instructions to work in the most effective ways. Each of the three timers counts down in a programmable way, generating a signal on its output pin when it counts down to 0. And so we see that the best idea in the world can fail for lack of either proper design or adequate horsepower.
Sometimes the BIU is able to use spare bus cycles to prefetch instruction bytes before the EU needs them, so in those cases instruction fetching takes no time at all, practically speaking. Consequently, the prefetch queue should be able to keep the Execution Unit well-supplied with instruction bytes at all times.
As with the precision Zen timer, the program in Listing 3. So assembly language programmers—unlike all other programmers—must take full responsibility for the quality of their code. Over the two years I worked at id, I wrote a number of columns about Quake in Dr.
Fast Convex Polygons 4. Not the Same Old Song 1. The results confirm our theories splendidly, and validate our new design. One fabulously cold day, inspiration strikes:. I kept at it though, and about a year later I finally convinced him to come down and take a look at id. Modern processors are much more complex than they were in ye olden days, although superscalar processors as they existed back in the olden times are covered.
It’s a Wonderful Life 4. The difference is that between decrementing a memory location simply an instruction and using a loop counter a functional instruction sequence. The two approaches are functionally interchangeable but not equivalent from a performance standpoint, and which programmin better depends on the particular context.