| Summary: | byte swaps needed for fprs (fgrevi?) and fpr/gpr transfers | ||
|---|---|---|---|
| Product: | Libre-SOC's first SoC | Reporter: | Jacob Lifshay <programmerjake> |
| Component: | Specification | Assignee: | Jacob Lifshay <programmerjake> |
| Status: | RESOLVED WONTFIX | ||
| Severity: | enhancement | CC: | libre-soc-isa, programmerjake |
| Priority: | --- | ||
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | Linux | ||
| NLnet milestone: | --- | total budget (EUR) for completion of task and all subtasks: | 0 |
| budget (EUR) for this task, excluding subtasks' budget: | 0 | parent task for budget allocation: | |
| child tasks for budget allocation: | The table of payments (in EUR) for this task; TOML format: | ||
| Bug Depends on: | |||
| Bug Blocks: | 1015 | ||
|
Description
Jacob Lifshay
2023-03-07 21:56:40 GMT
I accidentally posted the comment to https://bugs.libre-soc.org/show_bug.cgi?id=1015#c3 reproduced here: (In reply to Jacob Lifshay from bug #1015, comment #2) > it occurred to me that we may want to submit fpr/gpr converts as a separate > rfc from fpr/gpr moves/byte-swaps I added fpr/gpr grev to a copy of int_fp_mv for review. fpr/gpr grev replaces fmvfg/fmvtg, which are now just assembler aliases: https://git.libre-soc.org/?p=libreriscv.git;a=blob;f=openpower/sv/int_fp_mv_replace_fmv_with_fgrev.mdwn;h=4b3a6900deafad6493b7b4a3cf1e4da91b05a994;hb=HEAD It also occurred to me that there are no fp load/stores with byte swapping, we'll want to add those too, probably as a separate RFC. closing since now that I think about it more, transmutes between f64 <-> u32x2 and similar aren't that common, as well as this seems like something the ISA WG would reject. markos seems to like fgrev*: https://libre-soc.org/irclog/%23libre-soc.2023-03-10.log.html#t2023-03-10T21:48:18 |