fcvt.s.w
Convert signed 32-bit integer to single-precision float
Converts a 32-bit signed integer in integer register xs1 into a floating-point number in floating-point register fd.
All floating-point to integer and integer to floating-point conversion instructions round
according to the rm field.
A floating-point register can be initialized to floating-point positive zero using
fcvt.s.w fd, x0, which will never set any exception flags.
All floating-point conversion instructions set the Inexact exception flag if the rounded result differs from the operand value and the Invalid exception flag is not set.
Decode Variables
Bits<5> xs1 = $encoding[19:15];
Bits<3> rm = $encoding[14:12];
Bits<5> fd = $encoding[11:7];Execution
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IDL
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Sail
check_f_ok($encoding);
RoundingMode rounding_mode = rm_to_mode(rm, $encoding);
X[fd] = i32_to_f32(X[xs1], rounding_mode);
mark_f_state_dirty();{
assert(sizeof(xlen) >= 64);
let rs1_val_LU = X(rs1)[63..0];
match (select_instr_or_fcsr_rm (rm)) {
None() => { handle_illegal(); RETIRE_FAIL },
Some(rm') => {
let rm_3b = encdec_rounding_mode(rm');
let (fflags, rd_val_S) = riscv_ui64ToF32 (rm_3b, rs1_val_LU);
accrue_fflags(fflags);
F_or_X_S(rd) = rd_val_S;
RETIRE_SUCCESS
}
}
}