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github.com/moarvm/moarvm | IRC logs at colabti.org/irclogger/irclogger_logs/moarvm Set by AlexDaniel on 12 June 2018. |
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| timotimo | gist.github.com/timo/d84b2ea40ac0e...b4c01c8a44 - has an example of decont now | 00:14 | |
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| nwc10 | good *, #moarvm | 07:14 | |
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| Geth | MoarVM: c0ed9e32b4 | (Timo Paulssen)++ | 2 files make extop marks reachable again in MVM_op_get_mark |
14:24 | |
| MoarVM: 7a2881a85b | (Timo Paulssen)++ | src/debug/debugserver.c debugserver: implement simplest decont operation only when no code has to be run (like for Proxy) |
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| timotimo | there's one single op in moarvm that has "all" 8 operands | 22:59 | |
| that's asyncwritebytesto | |||
| there's a few others, but all of them are DEPRECATED_* ops | 23:00 | ||
| the MVM_op_infos blob is like 29 kbytes big | |||
| shaving one operand off of every op would free up 922 bytes | 23:01 | ||
| MasterDuke | heh. looks like between nqp and rakudo it's used exactly once | 23:02 | |
| timotimo | once we have dispatch, we could turn at least this one op into a dispatcher | 23:03 | |
| now, which ops have 7 operands? | |||
| aha a couple more | 23:04 | ||
| sp_add_I, sp_sub_I, sp_mul_I, nativecallbuild, and asynclisten | |||
| and asyncudp | 23:05 | ||
| i assume @values in MAST/Ops.nqp is the operand values | 23:13 | ||
| and there are plenty above 128, so it's definitely using all 8 bits in there | |||
| m: say 1656 R- 3735 | 23:16 | ||
| camelia | 2079 | ||
| timotimo | m: say (1656 R- 3735) / 824 | ||
| camelia | 2.523058 | ||
| timotimo | ^- the average op uses 2.5 operands | ||
| m: say 824 * 8 - (1656 R- 3735) | 23:17 | ||
| camelia | 4513 | ||
| timotimo | m: say 824 * 8 | ||
| camelia | 6592 | ||
| timotimo | that's not the right way around | 23:18 | |
| m: say 824 * 8 R- (1656 R- 3735) | |||
| camelia | -4513 | ||
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| timotimo | could save 4 kbytes if the operands were var-len, though then they'd have to live in a separate array and have an index into that in the op info itself | 23:18 | |
| m: say 1656 R- 3735 | 23:19 | ||
| camelia | 2079 | ||
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| timotimo | it'd have to be 16 bit at least, so as big as 2 operands still | 23:19 | |
| m: 4513 - 824 * 2 | |||
| camelia | WARNINGS for <tmp>: Useless use of "-" in expression "4513 - 824 *" in sink context (line 1) |
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| timotimo | m: say 4513 - 824 * 2 | ||
| camelia | 2865 | ||
| timotimo | so actually only 2.5 kbytes saved after all | 23:20 | |
| i'm looking at this mostly because bytecode validation costs quite a few cycles during startup | 23:21 | ||
| and that has to go through the op info and grab some things out | |||
| oh? there's a 6 bytes big hole between opcode and op name | 23:26 | ||
| 22128 bytes big now | 23:29 | ||
| that's significantly better! | |||
| so i ran nqp-m -e '' three times with callgrind and got a sum of 236_895_057 Ir | 23:31 | ||
| MVM_validate_static_frame was 75_439_617 of that | 23:32 | ||
| now it's 237_461_358 in total, interesting! | 23:33 | ||
| so that looks kind of like it got worse | |||
| 76_055_621 Ir on MVM_validate_static_frame, too | |||