c.fswsp

Store single-precision value to stack

This instruction is defined by:

  • anyOf:

    • allOf:

      • C, version >= C@2.0.0

      • F, version >= F@2.2.0

    • Zcf, version >= Zcf@1.0.0

This instruction is included in the following profiles:

  • RVA20S64 (Optional)

  • RVA20U64 (Mandatory)

  • RVA22S64 (Optional)

  • RVA22U64 (Mandatory)

  • RVA23S64 (Optional)

  • RVA23U64 (Mandatory)

  • RVB23S64 (Optional)

  • RVB23U64 (Mandatory)

  • RVI20U32 (Optional)

  • RVI20U64 (Optional)

Encoding

svg

Assembly format

c.fswsp fs2, imm(sp)

Synopsis

Stores a single-precision floating-point value in floating-point register rs2 to memory. It computes an effective address by adding the zero-extended offset, scaled by 4, to the stack pointer, x2. It expands to fsw rs2, offset(x2).

Access

M HS U VS VU

Always

Always

Always

Always

Always

Decode Variables

Bits<8> imm = {$encoding[8:7], $encoding[12:9], 2'd0};
Bits<5> rs2 = $encoding[6:2];

Execution

  • IDL

if (implemented?(ExtensionName::C) && (CSR[misa].C == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
if (implemented?(ExtensionName::F) && (CSR[misa].F == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg virtual_address = X[2] + imm;
write_memory<32>(virtual_address, f[rs2][31:0], $encoding);

Exceptions

This instruction may result in the following synchronous exceptions:

  • IllegalInstruction

  • LoadAccessFault

  • StoreAmoAccessFault

  • StoreAmoAddressMisaligned

  • StoreAmoPageFault