| lkcl | ghostmansd[m], lots to go over - i'm still very busy keeping my guest occupied, so i can only be brief, apologies | 00:21 |
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| programmerjake | as mentioned in https://bugs.libre-soc.org/show_bug.cgi?id=1072#c45 I want to remove Rc=1 from fmvfg since it's unnecessary since fp Rc=1 sets CR1 to some FPSCR bits, yet fmvfg doesn't modify FPSCR at all. lkcl and others, what do you think? | 04:29 |
| ghostmansd[m] | Hi Luke, looks like there's a confusion in 1094. In the last implementation I posted there's no need to even invent Node class, paths kinda form node along with the element. Let's wait till next week then when you have some time. | 06:49 |
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| lkcl | programmerjake, what's it going to look like in the spec? | 10:11 |
| lkcl | Rc=1 tests FRT and sets CR1, exactly like all other Scalar Floating-Point operations. | 10:12 |
| programmerjake | probably either XO extended to include bit 31 or bit 31 just being ignored | 10:13 |
| lkcl | what does VSX int-to-FP do? that's the behaviour to copy (exactly) | 10:13 |
| lkcl | 6.10.3 somewhere... | 10:14 |
| programmerjake | the vsx equivalent is mtvsrd | 10:15 |
| programmerjake | it has no Rc field | 10:15 |
| programmerjake | section 3.3.18 | 10:15 |
| programmerjake | note fmvfg is just copying bits, it is not a int <-> fp conversion | 10:16 |
| lkcl | Vector Convert with round to nearest From | 10:16 |
| lkcl | Signed Word to floating-point format VX-form | 10:16 |
| lkcl | vcfsx VRT,VRB,UIM | 10:16 |
| lkcl | ahhh | 10:16 |
| programmerjake | vcfsx is not the right one | 10:17 |
| lkcl | okaay yes bit-move? then definitely not | 10:17 |
| lkcl | good catch | 10:17 |
| programmerjake | fmvtg can have Rc since that's based on RT which is useful | 10:18 |
| programmerjake | fmvfg, not so much | 10:18 |
| lkcl | there is a *really* good reason why not to do anything and it's because in an OoO system with unified (tagged) in-flight Reservation Stations the entire operation can be elided as a simple "change the tag" | 10:18 |
| lkcl | let me just edit the spec... | 10:19 |
| programmerjake | yes, that's what the Rc=0 version can be | 10:19 |
| programmerjake | actually, i'll edit the spec tomorrow (probably) | 10:19 |
| lkcl | ok | 10:19 |
| lkcl | yes please | 10:20 |
| programmerjake | Rc=1 is still useful, since it lets you know if it's +0 and for f64 if the sign bit is set | 10:20 |
| lkcl | yes | 10:20 |
| lkcl | can you put "equivalent to mtvsrd" in the spec page as a cross-reference? | 10:21 |
| lkcl | ok i gotta get back to my guest | 10:21 |
| programmerjake | since +0 == 0 and sign bit set maps to negative integers | 10:21 |
| programmerjake | k, have fun! though please look at the email about grants since i need more money soon | 10:22 |
| programmerjake | added that equivalence note as a todo in https://bugs.libre-soc.org/show_bug.cgi?id=1015#c0 as well as updating a few other todos | 10:27 |
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| lkcl | ghostmansd, ahhh line 22: @core.hook(object) | 15:29 |
| lkcl | frickin awesome. of course object is the base class of everything. | 15:29 |
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| ghostmansd | lkcl, ah, you checked it :-) | 18:34 |
| ghostmansd | yeah, the fact that it goes in class MRO all way down to object is awesome | 18:34 |
| ghostmansd | and the default handler is... object! | 18:34 |
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| lkcl | it is quite mad how much effort goes into something so.... so... stupidly short amount of code | 23:27 |
| ghostmansd[m] | Yeah, I hope at least the benefits will justify it | 23:42 |
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