I knew a guy who worked at MS when they were developing the Barney doll. He signed up to beta/play-test the doll since he had a son in the target age range. He left work on Friday with the new Barney doll. When he came…
The code in question has to process a string of variable length. But the compiler/CPU can process bytes one at a time or much faster in groups. The code is trying to process as much as possible in groups of 128. But…
If this code only runs on one compiler version/CPU arch, then ASSUMING the compiler will do the RIGHT THING and auto-vectorize the code is okay. But if your code will be cross-platform/run on different OSes/CPU arch's,…
I assume the M1's SIMD registers are wider/more numerous than just the couple of size_t registers used for the loading/masking/accumulating inner loop in your run_swtches(). You can speedup the code by unrolling your…
If I unroll the 64-bit SWAR version by 8x instead of 4x, the runtime is reduced by another 10% over the 4x-unrolled SWAR version. Diminishing returns...
Almost the same as my SWAR version - which is what you're doing. But aren't you reading off the end of the buffer in your memcpy(&w...)? Say with an empty input string whose start address is aligned to sizeof(size_t)…
My SWAR version almost does what your vectorization algorithm description does - just that the SWAR-code looks rather gnarly because the compiler isn't auto-generating the vector code for you, it's hand-coded in C by me…
If I convert the unrolled-64-bit SWAR function to use 32-bit chunks instead, average runtime almost doubles, approx. 0.1s now. Need sleep now.
If I unroll the main while loop to handle 4x as much each time through the loop in the SWAR-version, the runtime drops to 0.0562s (average 10 runs). That's an overall 57.5x speedup.
I took the 64-bit SWAR ('S'IMD-'W'ithin-'A'-'R'egister) road and passed in the string length - the calling code has the length "right there"!!! Using the original run_switches function, app took 3.554s (average of 10…
There's a dark side to this pressure to perform well in all aspects - high suicide rate amongst your adults in the Palo Alto area. see https://www.mercurynews.com/2017/03/03/cdc-report-youth-suic...…
Some researchers suggest parents should praise effort instead of intelligence. see https://www.nytimes.com/1998/07/14/science/praise-children-f... Also children should be permitted to fail.
Looking at the nutritional info for Soylent and Vite Ramen shows that they also contain Vitamin D - at the same DRV percentages. If you're getting 105% of your magnesium from these items, then you're also getting 105%…
If you are missing, then authorities usually like to have a recent photo of you to aid in the search. I don't see an explicit reference to "recent image of me" in your "First step" list of data - photos in legal…
My guess is Symantec due to their change of corporate direction/vision in 2019 (selling enterprise sec biz to Broadcom, concentrating on consumer/smallbiz cybersecurity). see…
Not when you understand the economics/operation of 1980s desktop software. Multitasking OSes? Nope - not in the early-mid 1980s. You want to use another app? Save your work, quit your current app and launch the new app.…
Library is GPL (not LGPL), so usage will be limited to those who don't mind the entire app's source code being released.
I knew a guy who worked at MS when they were developing the Barney doll. He signed up to beta/play-test the doll since he had a son in the target age range. He left work on Friday with the new Barney doll. When he came…
The code in question has to process a string of variable length. But the compiler/CPU can process bytes one at a time or much faster in groups. The code is trying to process as much as possible in groups of 128. But…
If this code only runs on one compiler version/CPU arch, then ASSUMING the compiler will do the RIGHT THING and auto-vectorize the code is okay. But if your code will be cross-platform/run on different OSes/CPU arch's,…
I assume the M1's SIMD registers are wider/more numerous than just the couple of size_t registers used for the loading/masking/accumulating inner loop in your run_swtches(). You can speedup the code by unrolling your…
If I unroll the 64-bit SWAR version by 8x instead of 4x, the runtime is reduced by another 10% over the 4x-unrolled SWAR version. Diminishing returns...
Almost the same as my SWAR version - which is what you're doing. But aren't you reading off the end of the buffer in your memcpy(&w...)? Say with an empty input string whose start address is aligned to sizeof(size_t)…
My SWAR version almost does what your vectorization algorithm description does - just that the SWAR-code looks rather gnarly because the compiler isn't auto-generating the vector code for you, it's hand-coded in C by me…
If I convert the unrolled-64-bit SWAR function to use 32-bit chunks instead, average runtime almost doubles, approx. 0.1s now. Need sleep now.
If I unroll the main while loop to handle 4x as much each time through the loop in the SWAR-version, the runtime drops to 0.0562s (average 10 runs). That's an overall 57.5x speedup.
I took the 64-bit SWAR ('S'IMD-'W'ithin-'A'-'R'egister) road and passed in the string length - the calling code has the length "right there"!!! Using the original run_switches function, app took 3.554s (average of 10…
There's a dark side to this pressure to perform well in all aspects - high suicide rate amongst your adults in the Palo Alto area. see https://www.mercurynews.com/2017/03/03/cdc-report-youth-suic...…
Some researchers suggest parents should praise effort instead of intelligence. see https://www.nytimes.com/1998/07/14/science/praise-children-f... Also children should be permitted to fail.
Looking at the nutritional info for Soylent and Vite Ramen shows that they also contain Vitamin D - at the same DRV percentages. If you're getting 105% of your magnesium from these items, then you're also getting 105%…
If you are missing, then authorities usually like to have a recent photo of you to aid in the search. I don't see an explicit reference to "recent image of me" in your "First step" list of data - photos in legal…
My guess is Symantec due to their change of corporate direction/vision in 2019 (selling enterprise sec biz to Broadcom, concentrating on consumer/smallbiz cybersecurity). see…
Not when you understand the economics/operation of 1980s desktop software. Multitasking OSes? Nope - not in the early-mid 1980s. You want to use another app? Save your work, quit your current app and launch the new app.…
Library is GPL (not LGPL), so usage will be limited to those who don't mind the entire app's source code being released.