Author Topic: Axe Q&A  (Read 590697 times)

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Offline Darl181

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Re: Axe Q&A
« Reply #480 on: June 28, 2011, 04:50:42 pm »
Memory locations, meaning pointers?
Something like {P}++ ?
« Last Edit: June 28, 2011, 04:51:36 pm by Darl181 »
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Offline squidgetx

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Re: Axe Q&A
« Reply #481 on: June 30, 2011, 11:29:14 am »
Yes, and especially stuff like {P*2+4390+E+C}++; because whenever you have the form {EXP}+1->{EXP}, the expression has to be evaluated twice, while with the ++ and -- it only needs to be evaluated once.

Offline Anima

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Re: Axe Q&A
« Reply #482 on: July 01, 2011, 12:21:17 pm »
Is it possible to delete programs with Axe?


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Offline Runer112

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Re: Axe Q&A
« Reply #483 on: July 01, 2011, 12:25:16 pm »
Yes:

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Re: Axe Q&A
« Reply #484 on: July 06, 2011, 04:08:49 pm »
Is there a bitwise expression to turn off bits?  I'm pretty sure it's and, but I tried Disp (7 and (5))►Dec and it outputted 4 instead of 2 ???
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Offline Deep Toaster

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Re: Axe Q&A
« Reply #485 on: July 06, 2011, 04:16:27 pm »
Think about it in binary: 7 is %00000111 and 5 is %00000101. ANDing them together would give you %00000101, which should be 5.

What AND does is leave on all the bits that are on in both operands and turn off all the others. If you want to turn off a specific bit, you should AND it with a number with just that bit turned off -- for example, to turn off the first bit (second rightmost), you'd use AND %11111101.
« Last Edit: July 06, 2011, 04:16:51 pm by Deep Thought »




Offline Darl181

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Re: Axe Q&A
« Reply #486 on: July 06, 2011, 04:23:31 pm »
Ok, so you have to do it in a roundabout way...
* Darl181 wonders if there should be a decent description of what they do in the docs or command list :P
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Offline ztrumpet

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Re: Axe Q&A
« Reply #487 on: July 06, 2011, 04:25:14 pm »

Offline Quigibo

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Re: Axe Q&A
« Reply #488 on: July 07, 2011, 01:14:27 pm »
To turn off a bit pattern P in a number N, you just or the number with P and then And it with P compliment.  So for an 8 bit value in Axe:

N or P and not(P)
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Offline calc84maniac

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Re: Axe Q&A
« Reply #489 on: July 07, 2011, 10:40:46 pm »
Actually, N and not(P) is all you need.
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Offline Darl181

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Re: Axe Q&A
« Reply #490 on: July 11, 2011, 05:52:22 pm »
About how axe rounds down...
Does it always "round down" per se, or does it round closer to zero?
As in, would -10//3 equal -3 or -4 ?
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Offline yunhua98

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Re: Axe Q&A
« Reply #491 on: July 11, 2011, 05:57:58 pm »
with the number in decimal form, it just cuts off the digits to the right of the decimal point.  So closer to zero, I guess.

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Re: Axe Q&A
« Reply #492 on: July 11, 2011, 06:20:16 pm »
Axe doesn't round, it truncates.
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Offline Runer112

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Re: Axe Q&A
« Reply #493 on: July 11, 2011, 08:31:07 pm »
In Axe, calculations that would generate decimals, such as division, will always be truncated. When dealing with positive numbers, this means results are rounded down. However, with negative numbers, the story changes slightly depending upon how the math is performed.

With something like ⁻10//3, the signed division routine converts any negative inputs to positives and then corrects the sign later. So it actually calculates the result of 10/3 which gives 3 due to truncation, but then negating the final answer to correct for the signs results in the answer actually having been rounded to zero from -3.333...

However, with optimized divisions like ⁻7//2, the inputs are not first converted to positive numbers and then operated on, resulting in the truncation actually rounding down to ⁻4.


In summary:
  • Normal division: rounds to zero (down)
  • Signed division: rounds to zero (not always down)
  • Signed disivion by optimized constants: rounds down
« Last Edit: July 11, 2011, 08:34:37 pm by Runer112 »

Offline Darl181

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Re: Axe Q&A
« Reply #494 on: July 11, 2011, 08:53:05 pm »
Ok...and the only place that lists the optimized constants is the auto-opts thing that comes with axe?
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