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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
... %r11, %rsi
cmpq $131072, %rax
jne .L4
Same Register: 8.49272 GB/s
.L9:
movq (%rbx,%rdx,8), %r9
movq 8(%rbx,%rdx,8), %r10
movq 16(%rbx,%rdx,8), %r11
movq 24(%rbx,%rdx,8), %rbp
addq $4, %rdx
# This time reuse "rax" for all the popcnts.
pop...
How to get Last record from Sqlite?
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Stephen NguyenStephen Nguyen
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How to avoid explicit 'self' in Python?
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edited Dec 31 '09 at 6:27
answered Dec 31 '09 at 5:57
Ro...
What is the Windows version of cron? [closed]
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edited Jun 27 '16 at 20:08
answered Sep 25 '08 at 12:24
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Showing line numbers in IPython/Jupyter Notebooks
... to show the shortcuts
– nexayq
Jun 27 '16 at 10:21
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Compare object instances for equality by their attributes
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edited Mar 22 '19 at 23:27
wim
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answered A...
Printf width specifier to maintain precision of floating-point value
...nth = 1.0/7.0;
printf("%.*e\n", Digs, OneSeventh);
// 1.428571428571428492127e-01
But let's dig deeper ...
Mathematically, the answer is "0.142857 142857 142857 ...", but we are using finite precision floating point numbers.
Let's assume IEEE 754 double-precision binary.
So the OneSeventh = 1....
How to join two generators in Python?
...able in those regards.
– Corman
May 27 at 0:48
Corman, I agree your list constructor is indeed more readable. It would...
Get first and last day of month using threeten, LocalDate
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Jon SkeetJon Skeet
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Ternary operator (?:) in Bash
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edited Aug 27 at 5:16
wjandrea
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an...