| ghostmansd | lkcl, about 5bf3c705cc0736cf34456d173fc4c50da5aba037 | 03:59 |
|---|---|---|
| ghostmansd | I know what the fix is :-) | 03:59 |
| ghostmansd | the problem is, I don't understand what's going wrong if I pass FSI instead of SI | 04:00 |
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| programmerjake | interesting reading: https://people.kernel.org/linusw/rust-in-perspective | 11:46 |
| markos | nice article, I like the historical background given behind all those languages | 12:07 |
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| ghostmansd | I'm now re-considering the way we handle field mappings. I posted some of the investigations here: https://bugs.libre-soc.org/show_bug.cgi?id=898#c1. Below you can find how the new fields look. | 16:10 |
| ghostmansd | test_caller_svp64.py works | 16:16 |
| ghostmansd | Unsurprizingly, though: I haven't yet switched the code to these new classes (except for insndb and binutils). | 16:17 |
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| lkcl | ghostmansd, as long as PowerDecoderSubset can recognise the fields in their original form (by CSV column names), it's perfectly fine | 17:18 |
| lkcl | or | 17:18 |
| lkcl | more to the point | 17:18 |
| lkcl | if the fieldnames created as a PowerOp remain absolutely the same under all circumstances and under absolutely no circumstances change | 17:19 |
| lkcl | for all **TWELVE** uses across twelve pipelines | 17:19 |
| lkcl | and in the ISACaller Simulator | 17:19 |
| lkcl | it's "fine" | 17:19 |
| lkcl | the good news there, being: get it wrong it'll be bloody obvious | 17:20 |
| ghostmansd | Well I'm mostly centered on pysvp64asm/pysvp64dis/binutils for now | 17:21 |
| ghostmansd | But, what was obvious too, many our tricks are really covered by such fields, let's call them mappings. | 17:22 |
| ghostmansd | Mostly stuff from consts.py. | 17:23 |
| ghostmansd | Plus also some bits which were in the caller.py (RM and Prefix fields). | 17:23 |
| ghostmansd | What I really like about it is how it's remapped according to the actual layout. | 17:25 |
| ghostmansd | For example, how RM adopts the layout to match it to Prefix bits. | 17:25 |
| ghostmansd | In fact, inherit or incorporate these structures as many times you want, there will be exactly 1 selectable int throughout the whole course. And only 1 layer of access: the fields are remapped upon the time the class is created. | 17:28 |
| ghostmansd | That is, svp64_insn.prefix.rm.elwidth keeps the same SelectableInt created by the time we created svp64_insn instance. | 17:29 |
| ghostmansd | And all offsets were already "statically" known upon module import. That is, when I access elwidth, I access SI immediately with the exact index. | 17:29 |
| ghostmansd | This index already took into account all the changes related to layout. | 17:30 |
| lkcl | yes - i very much wanted the spec to be directly reflected in the code, so preserving field names/layout was important | 19:45 |
| lkcl | there is a huge penalty associated with arithmetic done on FSIs though! it literally has to do a bit-level reconstruction of the value, perform the arithmetic operation, then push the result back again *one bit at a time* into the underlying SI | 19:51 |
| lkcl | which is mental | 19:51 |
| lkcl | and we don't care | 19:51 |
| lkcl | ISACaller is still 1,000 times faster than running against TestIssuer, so serves its purpose extremely well | 19:52 |
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