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Instruction Descriptions 4–93
4.8.3 Load S_floating
Format:
Operation:
va ← {Rbv + SEXT(disp)}
CASE
big_endian_data: va’ ← va XOR 100
2
little_endian_data: va’ ← va
ENDCASE
Fa ← (va’)<31> || MAP_S((va’)<30:23>) || (va’)<22:0> || 0<28:0>
Exceptions:
Instruction mnemonics:
Qualifiers:
Description:
LDS fetches a longword (integer or S_floating) from memory and writes it to register Fa. If the
data is not naturally aligned, an alignment exception is generated. The MAP_S function causes
the 8-bit memory-format exponent to be expanded to an 11-bit register-format exponent
according to Table 2–2.
The virtual address is computed by adding register Rb to the sign-extended 16-bit displace-
ment. For a big-endian longword access, va<2> (bit 2 of the virtual address) is inverted, and
any memory management fault is reported for va (not va’). The source operand is fetched
from memory, is zero-extended in the low-order longword, and then written to register Fa.
Longword integers in floating registers are stored in bits <63:62,58:29>, with bits <61:59>
ignored and zeros in bits <28:0>.
LDS Fa.ws,disp.ab(Rb.ab)
!Memory format
Access Violation
Fault on Read
Alignment
Translation Not Valid
LDS Load S_floating (Load Longword Integer)
None