diff options
Diffstat (limited to 'gcc/real.h')
| -rw-r--r-- | gcc/real.h | 48 |
1 files changed, 39 insertions, 9 deletions
@@ -76,19 +76,49 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA /* **** Start of software floating point emulator interface macros **** */ /* REAL_VALUE_TYPE is an array of the minimum number of HOST_WIDE_INTs - required to hold MAX_LONG_DOUBLE_TYPE_SIZE bits. */ -#if MAX_LONG_DOUBLE_TYPE_SIZE == 128 -/* For 128 bit reals, we calculate internally with extra precision. */ -#define N (160 / BITS_PER_UNIT) + required to hold either a 96- or 160-bit extended precision floating + point type. This is true even if the maximum precision floating + point type on the target is smaller. */ +#if MAX_LONG_DOUBLE_TYPE_SIZE == 128 && !INTEL_EXTENDED_IEEE_FORMAT +#define REAL_VALUE_TYPE_SIZE 160 #else -#define N (MAX_LONG_DOUBLE_TYPE_SIZE / BITS_PER_UNIT) +#define REAL_VALUE_TYPE_SIZE 96 #endif -#define S sizeof (HOST_WIDE_INT) +#define REAL_WIDTH \ + (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \ + + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */ typedef struct { - HOST_WIDE_INT r[N/S + (N%S ? 1 : 0)]; /* round up */ + HOST_WIDE_INT r[REAL_WIDTH]; } REAL_VALUE_TYPE; -#undef N -#undef S + +/* Calculate the format for CONST_DOUBLE. We need as many slots as + are necessary to overlay a REAL_VALUE_TYPE on them. This could be + as many as five (32-bit HOST_WIDE_INT, 160-bit REAL_VALUE_TYPE). + + A number of places assume that there are always at least two 'w' + slots in a CONST_DOUBLE, so we provide them even if one would suffice. */ + +#if REAL_WIDTH == 1 +# define CONST_DOUBLE_FORMAT "0ww" +#else +# if REAL_WIDTH == 2 +# define CONST_DOUBLE_FORMAT "0ww" +# else +# if REAL_WIDTH == 3 +# define CONST_DOUBLE_FORMAT "0www" +# else +# if REAL_WIDTH == 4 +# define CONST_DOUBLE_FORMAT "0wwww" +# else +# if REAL_WIDTH == 5 +# define CONST_DOUBLE_FORMAT "0wwwww" +# else + #error "REAL_WIDTH > 5 not supported" +# endif +# endif +# endif +# endif +#endif extern unsigned int significand_size PARAMS ((enum machine_mode)); |