int32 float64_to_int32_round_to_zero( float64 a STATUS_PARAM ) { flag aSign; int16 aExp, shiftCount; uint64_t aSig, savedASig; int32 z; a = float64_squash_input_denormal(a STATUS_VAR); aSig = extractFloat64Frac( a ); aExp = extractFloat64Exp( a ); aSign = extractFloat64Sign( a ); if ( 0x41E < aExp ) { if ( ( aExp == 0x7FF ) && aSig ) aSign = 0; goto invalid; } else if ( aExp < 0x3FF ) { if ( aExp || aSig ) STATUS(float_exception_flags) |= float_flag_inexact; return 0; } aSig |= LIT64( 0x0010000000000000 ); shiftCount = 0x433 - aExp; savedASig = aSig; aSig >>= shiftCount; z = aSig; if ( aSign ) z = - z; if ( ( z < 0 ) ^ aSign ) { invalid: float_raise( float_flag_invalid STATUS_VAR); return aSign ? (int32_t) 0x80000000 : 0x7FFFFFFF; } if ( ( aSig<<shiftCount ) != savedASig ) { STATUS(float_exception_flags) |= float_flag_inexact; } return z; }