[Lldb-commits] [lldb] [lldb] New expedited register specfication for unavailable regs (PR #193894)

[Jason Molenda via lldb-commits]

jasonmolenda wrote:

Hmm, not quite, reg write s0 will only send the low 32 bits to debugserver, I'm surprised it doesn't send the full primordial (which it hasn't fetched)

```
  <reg name="v0" regnum="63" offset="268" bitsize="128" group="vector" type="float" altname="q0" encoding="vector" format="vector-uint8" group_id="2" dwarf_regnum="64" invalidate_regnums="164,63,97,129"/>
  <reg name="d0" regnum="97" offset="788" bitsize="64" group="float" type="float" encoding="ieee754" format="float" group_id="2" invalidate_regnums="164,63,97,129"/>
  <reg name="s0" regnum="129" offset="1044" bitsize="32" group="float" type="float" encoding="ieee754" format="float" group_id="2" invalidate_regnums="164,63,97,129"/>

(lldb) reg write s0 5
 <  31> send packet: $P81=0000a040;thread:5432aa;#63
 <   6> read packet: $OK#00

(lldb) reg read s0
 <  22> send packet: $p81;thread:5432aa;#91
 <  12> read packet: $0000a040#00
      s0 = 5
(lldb) reg read d0
 <  22> send packet: $p61;thread:5432aa;#8f
 <  20> read packet: $0000a04000000000#00
      d0 = 5.3567960152785439E-315
```

https://github.com/llvm/llvm-project/pull/193894