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Welcome to the main channel on the development of MoarVM, a virtual machine for NQP and Rakudo (moarvm.org). This channel is being logged for historical purposes. Set by lizmat on 24 May 2021. |
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| Nicholas | [* GOOD *] | 07:38 | |
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| lizmat | And yet another Rakudo Weekly News hits the Net: rakudoweekly.blog/2022/02/14/2022-...-released/ | 15:57 | |
| m: use nqp; say nqp::iseq_i(my uint $ = 18446744073709551615,-1) # nine, I wonder if we're also going to need iseq_u and related ops | 16:11 | ||
| camelia | 1 | ||
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| timo | iseq_ui you mean? | 16:43 | |
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| nine | I'm not sure that would be useful. If there was an nqp::iseq_u, then if you have to variables with values 18446744073709551615 and -1 respectively and you wanted to compare them with iseq_u, you'd have to type cast the int to uint first (QASTCompilerMAST will do that for you) and the result would still be the same, i.e. true. | 21:34 | |
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| lizmat | I was more thinking an iseq_u would first check whether the sign bit is the same when given mixed uint int types | 21:46 | |
| if they are not the same, then the values are not the same | |||
| when given two ints or two uints, just compare the bits | |||
| does that make sense? | 21:47 | ||
| nine | No, it doesn't, because the op mandates what the input types are and an iseq_u would obviously take 2 uints and that's what the compiler has to give it | 22:06 | |
| japhb | nine: I think that may be why timo commented about iseq_ui | ||
| nine | So the compiler has to generate the coercion code and then the iseq_u op cannot know that 18446744073709551615 once was -1 | ||
| So the compiler has to generate the coercion code and then the iseq_u op cannot know that 18446744073709551615 once was -1 | 22:07 | ||
| japhb | To check if a uint and an int were the same | ||
| nine | indeed | ||
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| lizmat | nine: ok, I now understand the problem :-) | 23:23 | |