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These immediates are sign extended and usually interpreted as signed, so it's less confusing to use signed numbers. This also matches SPIKE's disassembly.
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The restriction was present for `C.SLLI` but was missing for `C.SRLI` and `C.SRAI`.
The format is copied from `C.SLLI`.
Fixes #356
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This script was used to do the modification:
```
from pathlib import Path
import re
RE_LINE = r"/\*={50,150}\*/\n"
RE_MIDDLE = r"/\*.*\*/\n"
NEW_TEXT = """/*=======================================================================================*/
/* This Sail RISC-V architecture model, comprising all files and */
/* directories except where otherwise noted is subject the BSD */
/* two-clause license in the LICENSE file. */
/* */
/* SPDX-License-Identifier: BSD-2-Clause */
/*=======================================================================================*/
"""
REPLACEMENT = re.compile(rf"^{RE_LINE}(?:{RE_MIDDLE}){{10,100}}{RE_LINE}")
def main():
for file in Path("model").glob("**/*.sail"):
text = file.read_text(encoding="utf-8")
text = REPLACEMENT.sub(NEW_TEXT, text, 1)
file.write_text(text, encoding="utf-8")
if __name__ == "__main__":
main()
```
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Use newer bitfield syntax, which has been part of Sail for
a while now. Should in theory be more efficient as it removes
a level of indirection for bitfield accesses.
It's also much more friendly to `sail -fmt`, which has no idea
how to handle the old bitfield syntax.
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There are a few places where operand/field names are not consistent
across scattered definitions for an instruction.
Here, parameter `rs2` is used for encode/decode and execute, but
`rd` is used for the same purpose in the assembly clause:
```
mapping clause encdec_compressed = C_SWSP(ui76 @ ui52, rs2)
<-> 0b110 @ ui52 : bits(4) @ ui76 : bits(2) @ rs2 : regidx @ 0b10
function clause execute (C_SWSP(uimm, rs2)) = {
let imm : bits(12) = zero_extend(uimm @ 0b00);
execute(STORE(imm, rs2, sp, WORD, false, false))
}
mapping clause assembly = C_SWSP(uimm, rd)
<-> "c.swsp" ^ spc() ^ reg_name(rd) ^ sep() ^ hex_bits_6(uimm)
```
Fix these by using the operand names found in
"The RISC-V Instruction Set Manual, Volume I: Unprivileged ISA",
document version 20191213, and "RISC-V Cryptography Extensions
Volumn I: Scalar & Entropy Source Instructions", version v1.0.1.
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Rename EXTZ to zero_extend and EXTS to sign_extend. Two main reasons
for doing this - it means that the source more closely follows the
descriptions in the documentation with more readable names, and EXTS
and EXTZ are visually very close to each other with just the S and Z.
They are also following an odd convention where they are ALLCAPS rather
than snake_case like other functions in the spec.
I think this convention comes from early Power specs in Sail, which
influenced Sail MIPS and CHERI-MIPS, but I don't think it's a very
good convention we should be keeping in sail-riscv
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Fixes #51.
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contents of a register.
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to improve clarity.
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