fcvt.s.w
Convert signed 32-bit integer to single-precision float
This instruction is defined by:
Synopsis
Converts a 32-bit signed integer in integer register rs1 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 rd, 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> rs1 = $encoding[19:15];
Bits<3> rm = $encoding[14:12];
Bits<5> fd = $encoding[11:7];Execution
-
Pruned, XLEN == 64
-
Original
check_f_ok($encoding);
Bits<32> int_value = X[rs1];
Bits<1> sign = int_value[31];
RoundingMode rounding_mode = rm_to_mode(rm, $encoding);
if ((int_value & 32'h7fff_ffff) == 0) {
X[fd] = (sign == 1) ? 0xcf000000 : 0;
} else {
Bits<32> absA = (sign == 1) ? -int_value : int_value;
X[fd] = softfloat_normRoundPackToF32(sign, 0x9C, absA, rounding_mode);
}
mark_f_state_dirty();check_f_ok($encoding);
Bits<32> int_value = X[rs1];
Bits<1> sign = int_value[31];
RoundingMode rounding_mode = rm_to_mode(rm, $encoding);
if ((int_value & 32'h7fff_ffff) == 0) {
X[fd] = (sign == 1) ? packToF32UI(1, 0x9E, 0) : 0;
} else {
Bits<32> absA = (sign == 1) ? -int_value : int_value;
X[fd] = softfloat_normRoundPackToF32(sign, 0x9C, absA, rounding_mode);
}
mark_f_state_dirty();