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Which is faster : if (bool) or if(int)?
...ng with -03 gives the following for me:
f:
pushl %ebp
movl %esp, %ebp
cmpl $1, 8(%ebp)
popl %ebp
sbbl %eax, %eax
andb $58, %al
addl $99, %eax
ret
g:
pushl %ebp
movl %esp, %ebp
cmpb $1, 8(%ebp)
popl %ebp
sbbl ...
Purpose of ESI & EDI registers?
...ASM in 1985). Among these are
REP STOSB
REP MOVSB
REP SCASB
Which are, respectively, operations for repeated (= mass) storing, loading and scanning. What you do is you set up SI and/or DI to point at one or both operands, perhaps put a count in CX and then let 'er rip. These are operations that w...
What is the closest thing Windows has to fork()?
...l using
Win32 calls to emulate fork, the method has changed noticably.
Especially, we don't create the child process in the suspended state
anymore, unless specific datastructes need a special handling in the
parent before they get copied to the child. In the current 1.5.25
release the on...
how to replicate pinterest.com's absolute div stacking layout [closed]
... answered May 8 '13 at 17:33
espesp
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...
How to extract text from a PDF? [closed]
...mmend it. Google's pdf text extraction isn't as good as many alternatives (esp. for non-English) and it is also very very sloooow.
– Björn Lindqvist
May 19 '14 at 9:53
add a ...
Differences between C++ string == and compare()?
...har>,std::allocator<char> > (0D23EECh)
00D42A41 add esp,8
00D42A44 movzx edx,al
00D42A47 test edx,edx
00D42A49 je Algorithm::PerformanceTest::stringComparison_usingEqualOperator1+0C4h (0D42A54h)
string::compare()
if (str1.compare...
How to create a memory leak in Java?
... the classes it has loaded. It was even worse in many JVM implementations, especially prior to Java 7, because classes and ClassLoaders were allocated straight into permgen and were never garbage-collected at all.)
A variation on this pattern is why application containers (like Tomcat) can leak mem...
mqtt协议一般最大支持订阅几个主题？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
...内存）往往是更常见的瓶颈。嵌入式设备： 一个运行在ESP32或STM32单片机上的客户端，其可用内存可能只有几百KB。它可能只能成功维护几十个甚至几个订阅，因为每个订阅都需要内存来存储主题过滤器和其他相关状态。超过限...
Why are these constructs using pre and post-increment undefined behavior?
... 0x00000000 <+0>: push %ebp
0x00000001 <+1>: mov %esp,%ebp
0x00000003 <+3>: sub $0x10,%esp
0x00000006 <+6>: movl $0x0,-0x4(%ebp) // i = 0 i = 0
0x0000000d <+13>: addl $0x1,-0x4(%ebp) // i++ i = 1
0x00000011 <+17>: mov ...
In C, do braces act as a stack frame?
...Edit: Kristopher Johnson (and simon and Daniel) are right, and my initial response was wrong. With gcc 4.3.4.on CYGWIN, the code:
void foo(int[]);
void bar(void);
void foobar(int);
void foobar(int flag) {
if (flag) {
int big[100000000];
foo(big);
}
bar();
}
gives:
...