area-CodeGen-coreclrenhancementhelp wanted
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描述
The instrsxarch.h encodings are currently ordered as follows:
- R/M[reg]
- R/M,icon
- reg,R/M
- eax,i32
- register
This ordering appears to have been done in order to save space, as not all instructions require all encodings However, with the addition of HardwareIntrinsics, a large number of INST3 encodings were added and often, only one or two of the encodings are used.
It may be beneficial to consider reordering these encodings in order to save additional space. Looking briefly at the encodings, I see the following:
| encoding | # entries | # bad_code |
|---|---|---|
| R/M[reg] | 527 | 366 |
| R/M,icon | 444 | 390 |
| reg,R/M | 421 | 56 |
| eax,i32 | 21 | 10 |
| register | 9 | 1 |
category:implementation theme:emitter skill-level:beginner cost:medium impact:small