fssr and frsr instructions aren't mentioned for F extension
#419
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laanwj
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fssr and frsr instructions aren't mentioned for F extensionsfssr and frsr instructions aren't mentioned for F extension
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They’re pseudoinstructions that map to CSR-access instructions. (And they
may well be missing from the documentation.)
…On Mon, Jul 29, 2019 at 5:19 AM Wladimir J. van der Laan < ***@***.***> wrote:
Just a documentation issue I think: The fssr and frsr instructions (which
set and read the fcsr, respectively) aren't mentioned in the
specification for the F extension. The names don't appear in the spec at
all.
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Oh. Thanks! I'm confused now, this came up in rust-embedded/riscv#157, there was the assumption that these were separate instructions, but if they map to the same thing then it's probably not necessary to mention them. |
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Hi! I also noticed this issue recently. Are |
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Correct. But the obsolete aliases will be supported in perpetuity, since
important software (like glibc) relies upon them.
…On Tue, Jul 30, 2019 at 2:19 AM Mel Chen ***@***.***> wrote:
Hi! I also noticed this issue recently. Are frsr and fssr instructions
obsolete, or renamed to frcsr and fscsr respectively? Thanks.
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Good to know! |
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Don't worried. I am preparing binutils patches to update |
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Thanks! |
TheThirdOne
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Oct 14, 2019
These are just aliases for fscsr and frcsr respectively. They are not mentioned in the specification as they are outdated. They were added because the move.s test uses them. Information about them can be found at riscv/riscv-isa-manual#419
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Just a documentation issue I think: The
fssrandfrsrinstructions (which set and read thefcsr, respectively) aren't mentioned in the specification for the F extension. The names don't appear in the spec at all.The text was updated successfully, but these errors were encountered: