c.fsdsp

Store double-precision value to stack

Stores a double-precision floating-point value in floating-point register fs2 to memory. It computes an effective address by adding the zero-extended offset, scaled by 8, to the stack pointer, x2. It expands to fsd fs2, offset(x2).

Assembly format

c.fsdsp fs2, imm(sp)

Decode Variables

Bits<9> imm = {$encoding[9:7], $encoding[12:10], 3'd0};
Bits<5> fs2 = $encoding[6:2];

Execution

  • IDL

if (implemented?(ExtensionName::C) && (misa.C == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
if (implemented?(ExtensionName::D) && (misa.D == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg virtual_address = X[2] + imm;
write_memory<64>(virtual_address, f[fs2][63:0], $encoding);

Exceptions

This instruction may result in the following synchronous exceptions:

  • IllegalInstruction

  • LoadAccessFault

  • StoreAmoAccessFault

  • StoreAmoAddressMisaligned

  • StoreAmoPageFault

Encoding

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Defining extension

  • anyOf:

    • allOf:

      • C, version >= C@2.0.0

      • D, version >= D@2.2.0

    • Zcd, version >= Zcd@1.0.0

Access

M HS U VS VU

Always

Always

Always

Always

Always

Containing profiles

  • Mandatory: RVA20S64, RVA20U64, RVA22S64, RVA22U64, RVA23M64, RVA23S64, RVA23U64, RVB23M64, RVB23S64, RVB23U64

  • Optional: RVI20U32, RVI20U64