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[spec] Add note to instruction index #1528

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Merged
rossberg merged 2 commits into from
Aug 25, 2022
Merged

[spec] Add note to instruction index #1528

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[spec] Add note to instruction index
rossberg Aug 25, 2022
438afdf
Grammar
rossberg Aug 25, 2022
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9 changes: 9 additions & 0 deletions document/core/appendix/gen-index-instructions.py
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Expand Up @@ -21,6 +21,14 @@
---------------------
"""

FOOTER = """\

.. note::
Multi-byte opcodes are given with the shortest possible encoding in the table.
However, what is following the first byte is actually a :ref:`u32 <binary-uint>` with variable-length encoding,
and consequently, has multiple possible representations.\
"""

COLUMNS = [
'Instruction',
'Binary Opcode',
Expand Down Expand Up @@ -591,3 +599,4 @@ def Row(columns):
print(Row(instr), file=f)

print(DIVIDER, file=f)
print(FOOTER, file=f)
5 changes: 5 additions & 0 deletions document/core/appendix/index-instructions.rst
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Expand Up @@ -516,3 +516,8 @@ Instruction Binary Opcode
:math:`\F64X2.\VCONVERT\K{\_low\_i32x4\_s}` :math:`\hex{FD}~~\hex{FE}~~\hex{01}` :math:`[\V128] \to [\V128]` :ref:`validation <valid-vcvtop>` :ref:`execution <exec-vcvtop>`, :ref:`operator <op-convert_s>`
:math:`\F64X2.\VCONVERT\K{\_low\_i32x4\_u}` :math:`\hex{FD}~~\hex{FF}~~\hex{01}` :math:`[\V128] \to [\V128]` :ref:`validation <valid-vcvtop>` :ref:`execution <exec-vcvtop>`, :ref:`operator <op-convert_u>`
================================================= ==================================== ============================================= ============================================= ==================================================================

.. note::
Multi-byte opcodes are given with the shortest possible encoding in the table.
However, what is following the first byte is actually a :ref:`u32 <binary-uint>` with variable-length encoding,
and consequently, has multiple possible representations.