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How to count the number of set bits in a 32-bit integer?
...all enough counts) that this doesn't produce carry into that top 8 bits.
A 64-bit version of this can do 8x 8-bit elements in a 64-bit integer with a 0x0101010101010101 multiplier, and extract the high byte with >>56. So it doesn't take any extra steps, just wider constants. This is what GCC...
What are bitwise shift (bit-shift) operators and how do they work?
... of two that added together makes 320:
(row * 320) = (row * 256) + (row * 64)
Now we can convert that into left shifts:
(row * 320) = (row << 8) + (row << 6)
For a final result of:
memoryOffset = ((row << 8) + (row << 6)) + column
Now we get the same offset as before...
“Failed to load platform plugin ”xcb“ ” while launching qt5 app on linux without qt installed
...the /usr/bin/platforms dir created. Solved with: sudo ln -sf /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/ /usr/bin/
– gipsh
Mar 13 '17 at 17:31
...
What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?
...lt; N), finding the position (N) of the highest set bit is the integer log base 2 of that integer.
http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogObvious
unsigned int v;
unsigned r = 0;
while (v >>= 1) {
r++;
}
This "obvious" algorithm may not be transparent to everyone...
Why is there no std::stou?
...+11 21.5/1: Effects: the first two functions call strtol(str.c_str(), ptr, base), and the last three functions call strtoul(str.c_str(), ptr, base), strtoll(str.c_str(), ptr, base), and strtoull(str.c_str(), ptr, base), respectively.
– Mike Seymour
Jan 3 '12 at...
What is the difference between the 'COPY' and 'ADD' commands in a Dockerfile?
...the useless compressed package.
For COPY:
COPY resources/jdk-7u79-linux-x64.tar.gz /tmp/
RUN tar -zxvf /tmp/jdk-7u79-linux-x64.tar.gz -C /usr/local
RUN rm /tmp/jdk-7u79-linux-x64.tar.gz
For ADD:
ADD resources/jdk-7u79-linux-x64.tar.gz /usr/local/
ADD supports local-only tar extraction. Beside...
What is the closest thing Windows has to fork()?
...ng Windows 9x users. However, two
attempts to use ZwCreateProcess on NT-based systems failed for one
reason or another.
It would be really nice if this stuff would be better or at all
documented, especially a couple of datastructures and how to connect a
process to a subsystem. While ...
Update Eclipse with Android development tools v. 23
...e should now work with auto-update, so install these new versions:
linux 64 bit vm: http://dl.google.com/android/adt/adt-bundle-linux-x86_64-20140702.zip
linux 32 bit vm: http://dl.google.com/android/adt/adt-bundle-linux-x86-20140702.zip
mac: http://dl.google.com/android/adt/adt-bundle-mac-x86_64-...
How to find out which package version is loaded in R?
... LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] graphics grDevices utils datasets stats grid methods base
other attached packages:
[1] ggplot2_0.9.0 reshape2_1.2.1 plyr_1.7.1
loaded via a namespace (and not attached):
[1] co...
为维护国家安全 中国限制出口无人机和高性能计算机 - 资讯 - 清泛网 - 专注...
...术注释
调整后的峰值性能（APP）是指数字计算机在进行64位或更多位的浮点加法和乘法运算的调整后的峰值速度。
本技术说明涉及的缩写：
n “数字计算机”中的处理器数量
I 处理器编号（1，……，n）
ti 处理器时钟周期（...