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| brrt | \o | 06:25 | |
| i am in fact no longer fully convinced that a second 'register assignment' loop in linear scan maear scan makes any sense at all | 06:30 | ||
| because you need to be able to find the ' current' live range that stands for a particular value, and that 'current' version lives usuaully in the active set to begin with | 06:32 | ||
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| brrt | you *can* move it t o a later phase but it is kind of pointlyess | 06:39 | |
| pointless | |||
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| brrt | hmmm, okay, so let me think about that some more | 07:04 | |
| while running linear scan, I may have to update existing references to live ranges to other references because the live range themselves have been spilled | 07:05 | ||
| if i wait with register assignment until after the first loop, I can simply read the registers per tile from the updates references | 07:06 | ||
| however, since i already must do the update, updating the register number rather than the reference seems to me to be equivalent | |||
| so what i need... is a register assignment primitive that updates the users of the live range to the new register | 07:09 | ||
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| brrt | so, sucky news, but $employer has just suspended the hackathon time... | 10:19 | |
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| timotimo | :o | 10:33 | |
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| brrt | yes | 11:00 | |
| the good news bit is that I think I have a definitive answer to the second-loop problem; it is not necessary and it doesn't simplify anything | 11:01 | ||
| timotimo | first-loop problems, man | ||
| brrt | :-D | 11:02 | |
| note for future references: I'm going to store the index node-that-references the live range along in the use array of the live ranges, so that I have a complete mapping from live ranges to tile nodes, so that when I assign the actual register to the live range, I can find the tiles that have to be assigned the register to by simply looping over the 'uses' array | 11:07 | ||
| which means that i no longer have to maintain a tile -> live range mapping because the mapping will be in the reverse order, which is the interesting order anyway | 11:08 | ||
| and... if i do that for definitions as well as uses, this generalizes nicely because definitions are always in the '0' index, and I can still always 'reuse' the definitions/uses when splitting/spilling | 11:11 | ||
| but first, lunch & | |||
| timotimo | ah, nice | ||
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| timotimo | should i continue putting "but got REPR debug_name" stuff into places like the interpreter? | 15:57 | |
| maybe smaller code would be better | |||
| so maybe there should be a function that gets called to build the error message from a few parts | |||
| i'm not convinced that's actually smaller | |||
| OTOH, we jit a bunch of things, so the size of the interpreter itself isn't as noticable for hot things | 16:01 | ||
| brrt | i don't really know the answer to that, tbh | 16:34 | |
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