search for: precomputing

I see there are still some floating point operations left in the codec init(ialization) code. Changing that code to fixed point is not only difficult (due to the trigonometric functions etc) but may also degrade the precision. Here is an idea whereby we can easily precompute (record) all those values on a powerful processor and then use (replay) them on an embedded processor / DSP. The only

Firstly, running for more channels will not break my hack. All that's needed is to call RECOPLAY_MARK with different identifiers (say nb, wb or uwb) before doing the appropriate initialization. Secondly, my attempts to do the Gaussian in fixed point went like this : Define a new constant lag_factor_gauss that is manually set equal to exp(sqr(2*M_PI*lag_factor)/-2) by whoever changes the

On 5/30/2008 11:40 AM, rocket at google.com wrote: > I've run into a scoping problem in R. No, in your use of it. > I'm calling a function that > * creates a formula ... incorrectly. > * calculates a weight vector > * calls lm with that formula and weights > This fails. > > Here's a simplified reproduce example: > # f works, g doesn't, h is

I've run into a scoping problem in R. I'm calling a function that * creates a formula * calculates a weight vector * calls lm with that formula and weights This fails. Here's a simplified reproduce example: # f works, g doesn't, h is a workaround rm(w) data <- data.frame(y=runif(20), x=runif(20), z=runif(20)) f <- function(k){ w <- data$z^k coef(lm(y~x, data

...is. The idea of llvmbuilder is that it is a > "free" wrapper around the other existing API calls. Making the > methods virtual would make them much more expensive. Wouldn't the class of the objects be known at compile time in most cases? This is essentially just a case of precomputing constants, so I think this should be possible. If yes, the compiler can predetermine the type, hence the virtual method table that will be used, and can replace the virtual call with a static one. Does such an approach make sense with LLVM? (I'd want to do such things for my personal language...

Aki Tuomi wrote: > The use of salt, today, is to prevent the attacker from directly seeing > who has same passwords. Of course it also will make a rainbow table > attack less useful, Not just less useful, but almost infeasible. Given the use of random salts, you would have to generate (number of possible salts) rainbow tables. This drastically changes the CPU/storage tradeoffs. >

On Thu, 28 May 2015, Hubert Kario wrote: > > If this is the only attack you're trying to address, and you've > > already limited yourself to safe primes, then NUMS properties don't > > really add anything. The NUMS approach is there are to try to avoid > > the possibility of other, unknown cryptanalytic attacks against some > > infrequent type of group,

...ard data common among many apps (eg null sessions), and no salting is employed, we can use create Rainbow Tables, and afterwards find the secret very quickly. 4. Precomputation Cookie session computes the hash by *appending* the secret to the data. This can be used to speed up the brute force, by precomputing the hash of the data, and starting the hash function on the candidate session. The correct way to use the key is to repeatedly XOR it to the data, not append it. 5. Key Storage One of the most common crypto truisms developers know is "Don''t store passwords in the clear". Backu...

Hi, I am trying to figure a way to allocate a string SEXP so that gc() won't ever collect it. Here is a little bit of a background. Suppose I want to write a .Call-callable function that upon each call returns the same value, say mkChar("foo"): SEXP getFoo() { return mkChar("foo"); } The above implementation doesn't take advantage of the fact that

On 10/17/2012 9:04 AM, Duncan Sands wrote: > Unfortunately I have no idea how to implement this in a reasonable way. It should be possible to precompute the layout of the .ll file from the IR itself and then add self-annotations. It may require a special form of dumping the IR into a .ll file to make sure that empty lines, etc. are properly synchronized with the annotations. Wouldn't

A. Schulze writes: > precomputing ssl-params is also possible without patching but it's a > little bit tricky > ... > Long version in german: https://andreasschulze.de/dovecot/ssl-params Nice. (You should probably point out to ensure ssl_parameters_regenerate is zero, otherwise all this work will get wiped out!) Jos...

...lvmbuilder is that it is a >> "free" wrapper around the other existing API calls. Making the >> methods virtual would make them much more expensive. > > Wouldn't the class of the objects be known at compile time in most > cases? This is essentially just a case of precomputing constants, so I > think this should be possible. > > If yes, the compiler can predetermine the type, hence the virtual method > table that will be used, and can replace the virtual call with a static > one. Please verify that this actually happens in practice with llvm-gcc and gcc....

On Tue, October 7, 2008 9:02 am, David Greene wrote: > On Tuesday 07 October 2008 00:32, Nicolas Capens wrote: > >> Anyway, this can definitely also be done with an analysis pass that >> provides information about ordering between loads and stores. It's just > > Actually, no it can't. See the thread about analysis passes depending on > other analysis passes and

Hello Matthias, On 28 July 2017 at 04:13, Matthias Braun <mbraun at apple.com> wrote: > It's not that hard in principle: > - A register class is a set of registers. > - Virtual Registers have a register class assigned. > - If you have register constraints (like x86 8bit operations only work on > al,ah,etc.) then you have to create a new register class to express that.

Also, how are default moduli shipped with OpenSSH for use in diffie-hellman-group-exchange-sha1/sha256 chosen? Are they chosen randomly by developers or are they chosen for security properties? If they are random, why not use moduli from RFC 7919 instead, like Mozilla recommends? On Fri, Feb 15, 2019 at 3:48 AM Mark D. Baushke <mdb at juniper.net> wrote: > > Yegor Ievlev <koops1997

HotSlots Webmaster <webmaster at hotslots132.com> writes: > I have had Dovecot working fine with SSL for nearly two years now. It's > time to renew the SSL certificate, so I did (same CA). The new > certificate works fine in Apache and Postfix. But when I update Dovecot > to use the same certificate, and restart the server, Dovecot stops > responding to connects. > ...

On Tuesday 07 October 2008 00:32, Nicolas Capens wrote: > Anyway, this can definitely also be done with an analysis pass that > provides information about ordering between loads and stores. It's just Actually, no it can't. See the thread about analysis passes depending on other analysis passes and when things do and don't get updated by PassManager.

Hi, Can anybody briefly explain the significance of the updated moduli file? Is this a critical update? Should all existing installations update their moduli file? Thanks in advance, -- Dan

On Wed, Sep 6, 2017 at 4:20 PM, Karol Herbst <karolherbst at gmail.com> wrote: >> In this instance, I think using multiplication is more intuitive >> than '&&', so I'm adding a comparison to zero instead to shut up >> the warning. To further improve readability, I also make the >> error case indented and leave the normal case as the final

Hello everyone, For the context of question, I have a small loop written in a custom front-end which can be fairly accurately expressed with the following C program: struct Array { double * data; long n; }; #define X 0 #define Y 1 #define Z 2 void f(struct Array * restrict d, struct Array * restrict out, const long n) { for (long i = 0;