GCC Middle and Back End API Reference
Functions
dfp.c File Reference

Functions

static void decimal_from_decnumber ()
void decimal_real_from_string ()
static void decimal_to_decnumber ()
void encode_decimal32 (const struct real_format *fmt, long *buf, const REAL_VALUE_TYPE *r)
void decode_decimal32 (const struct real_format *fmt, REAL_VALUE_TYPE *r, const long *buf)
void encode_decimal64 (const struct real_format *fmt, long *buf, const REAL_VALUE_TYPE *r)
void decode_decimal64 (const struct real_format *fmt, REAL_VALUE_TYPE *r, const long *buf)
void encode_decimal128 (const struct real_format *fmt, long *buf, const REAL_VALUE_TYPE *r)
void decode_decimal128 (const struct real_format *fmt, REAL_VALUE_TYPE *r, const long *buf)
static void decimal_to_binary (REAL_VALUE_TYPE *to, const REAL_VALUE_TYPE *from, enum machine_mode mode)
static void decimal_from_binary ()
int decimal_do_compare (const REAL_VALUE_TYPE *a, const REAL_VALUE_TYPE *b, int nan_result)
void decimal_round_for_format ()
void decimal_real_convert (REAL_VALUE_TYPE *r, enum machine_mode mode, const REAL_VALUE_TYPE *a)
void decimal_real_to_decimal (char *str, const REAL_VALUE_TYPE *r_orig, size_t buf_size, size_t digits, int crop_trailing_zeros)
static bool decimal_do_add (REAL_VALUE_TYPE *r, const REAL_VALUE_TYPE *op0, const REAL_VALUE_TYPE *op1, int subtract_p)
static bool decimal_do_multiply (REAL_VALUE_TYPE *r, const REAL_VALUE_TYPE *op0, const REAL_VALUE_TYPE *op1)
static bool decimal_do_divide (REAL_VALUE_TYPE *r, const REAL_VALUE_TYPE *op0, const REAL_VALUE_TYPE *op1)
void decimal_do_fix_trunc ()
HOST_WIDE_INT decimal_real_to_integer ()
void decimal_real_to_integer2 (HOST_WIDE_INT *plow, HOST_WIDE_INT *phigh, const REAL_VALUE_TYPE *r)
bool decimal_real_arithmetic (REAL_VALUE_TYPE *r, enum tree_code code, const REAL_VALUE_TYPE *op0, const REAL_VALUE_TYPE *op1)
void decimal_real_maxval ()

Function Documentation

static bool decimal_do_add ( REAL_VALUE_TYPE *  r,
const REAL_VALUE_TYPE *  op0,
const REAL_VALUE_TYPE *  op1,
int  subtract_p 
)
static 
     Return true, if inexact.

References decimal_from_decnumber(), and decimal_to_decnumber().

int decimal_do_compare ( const REAL_VALUE_TYPE *  a,
const REAL_VALUE_TYPE *  b,
int  nan_result 
) 
   Helper function to real.c:do_compare() to handle decimal internal
   representation including when one of the operands is still in the
   binary internal representation.  
     If either operand is non-decimal, create temporary versions.  
     Convert into decNumber form for comparison operation.  
     Finally, do the comparison.  
     Return the comparison result.
static bool decimal_do_divide ( REAL_VALUE_TYPE *  r,
const REAL_VALUE_TYPE *  op0,
const REAL_VALUE_TYPE *  op1 
)
static 
   Compute R = OP0 / OP1.  
     Return true, if inexact.
void decimal_do_fix_trunc ( ) 
   Set R to A truncated to an integral value toward zero (decimal
   floating point).

Referenced by do_compare().

static bool decimal_do_multiply ( REAL_VALUE_TYPE *  r,
const REAL_VALUE_TYPE *  op0,
const REAL_VALUE_TYPE *  op1 
)
static 
   Compute R = OP0 * OP1.  
     Return true, if inexact.
static void decimal_from_binary ( )
static 
   Helper function to convert from a binary real internal
   representation.  
     We convert to string, then to decNumber then to decimal128.

Referenced by decimal_real_to_integer2().

static void decimal_from_decnumber ( )
static 
   Initialize R (a real with the decimal flag set) from DN.  Can
   utilize status passed in via CONTEXT, if a previous operation had
   interesting status.

Referenced by decimal_do_add().

bool decimal_real_arithmetic ( REAL_VALUE_TYPE *  r,
enum tree_code  code,
const REAL_VALUE_TYPE *  op0,
const REAL_VALUE_TYPE *  op1 
) 
   Perform the decimal floating point operation described by CODE.
   For a unary operation, OP1 will be NULL.  This function returns
   true if the result may be inexact due to loss of precision.  
     If either operand is non-decimal, create temporaries.  
           Flip sign bit.  
           Keep sign field in sync.  
           Clear sign bit.  
           Keep sign field in sync.
void decimal_real_convert ( REAL_VALUE_TYPE *  r,
enum machine_mode  mode,
const REAL_VALUE_TYPE *  a 
) 
   Extend or truncate to a new mode.  Handles conversions between
   binary and decimal types.

Referenced by real_nan().

void decimal_real_from_string ( ) 
   Create decimal encoded R from string S.  
     It would be more efficient to store directly in decNumber format,
     but that is impractical from current data structure size.
     Encoding as a decimal128 is much more compact.

Referenced by decimal_to_binary().

void decimal_real_maxval ( ) 
   Fills R with the largest finite value representable in mode MODE.
   If SIGN is nonzero, R is set to the most negative finite value.
void decimal_real_to_decimal ( char *  str,
const REAL_VALUE_TYPE *  r_orig,
size_t  buf_size,
size_t  digits,
int  crop_trailing_zeros 
) 
   Render R_ORIG as a decimal floating point constant.  Emit DIGITS
   significant digits in the result, bounded by BUF_SIZE.  If DIGITS
   is 0, choose the maximum for the representation.  If
   CROP_TRAILING_ZEROS, strip trailing zeros.  Currently, not honoring
   DIGITS or CROP_TRAILING_ZEROS.  
     decimal128ToString requires space for at least 24 characters;
     Require two more for suffix.
HOST_WIDE_INT decimal_real_to_integer ( ) 
   Render decimal float value R as an integer.  
     Convert to REAL_VALUE_TYPE and call appropriate conversion
     function.
void decimal_real_to_integer2 ( HOST_WIDE_INT *  plow,
HOST_WIDE_INT *  phigh,
const REAL_VALUE_TYPE *  r 
) 
   Likewise, but to an integer pair, HI+LOW.  
     Convert to REAL_VALUE_TYPE and call appropriate conversion
     function.

References decimal_from_binary().

Referenced by real_can_shorten_arithmetic().

void decimal_round_for_format ( ) 
   Helper to round_for_format, handling decimal float types.  
     Real encoding occurs later.  
         The internal format is already in this format.

Referenced by real_nan().

static void decimal_to_binary ( REAL_VALUE_TYPE *  to,
const REAL_VALUE_TYPE *  from,
enum machine_mode  mode 
)
static 
   Helper function to convert from a binary real internal
   representation.

References decimal_real_from_string(), and real_to_decimal().

static void decimal_to_decnumber ( )
static 
   Initialize a decNumber from a REAL_VALUE_TYPE.  
             dconst{1,2,m1,half} are used in various places in
             the middle-end and optimizers, allow them here
             as an exception by converting them to decimal.  
     Fix up sign bit.

References dconst1, dconst2, dconsthalf, dconstm1, rvc_inf, rvc_nan, rvc_normal, and rvc_zero.

Referenced by decimal_do_add().

void decode_decimal128 ( const struct real_format *  fmt,
REAL_VALUE_TYPE *  r,
const long *  buf 
) 
   Decode an IEEE 754 decimal128 type into a real.
void decode_decimal32 ( const struct real_format *  fmt,
REAL_VALUE_TYPE *  r,
const long *  buf 
) 
   Decode an IEEE 754 decimal32 type into a real.
void decode_decimal64 ( const struct real_format *  fmt,
REAL_VALUE_TYPE *  r,
const long *  buf 
) 
   Decode an IEEE 754 decimal64 type into a real.

References memcpy().

void encode_decimal128 ( const struct real_format *  fmt,
long *  buf,
const REAL_VALUE_TYPE *  r 
) 
   Encode a real into an IEEE 754 decimal128 type.

References memcpy().

void encode_decimal32 ( const struct real_format *  fmt,
long *  buf,
const REAL_VALUE_TYPE *  r 
) 
   Encode a real into an IEEE 754 decimal32 type.
void encode_decimal64 ( const struct real_format *  fmt,
long *  buf,
const REAL_VALUE_TYPE *  r 
) 
   Encode a real into an IEEE 754 decimal64 type.

Referenced by decode_vax_d().