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@ -56,6 +56,7 @@ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. |
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#endif |
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#endif |
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static int mant_bits_set (const struct floatformat *, const unsigned char *); |
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static unsigned long get_field (const unsigned char *, |
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enum floatformat_byteorders, |
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unsigned int, |
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@ -82,28 +83,32 @@ const struct floatformat floatformat_ieee_single_big = |
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floatformat_big, 32, 0, 1, 8, 127, 255, 9, 23, |
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floatformat_intbit_no, |
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"floatformat_ieee_single_big", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_ieee_single_little = |
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{ |
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floatformat_little, 32, 0, 1, 8, 127, 255, 9, 23, |
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floatformat_intbit_no, |
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"floatformat_ieee_single_little", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_ieee_double_big = |
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{ |
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floatformat_big, 64, 0, 1, 11, 1023, 2047, 12, 52, |
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floatformat_intbit_no, |
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"floatformat_ieee_double_big", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_ieee_double_little = |
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{ |
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floatformat_little, 64, 0, 1, 11, 1023, 2047, 12, 52, |
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floatformat_intbit_no, |
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"floatformat_ieee_double_little", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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/* floatformat for IEEE double, little endian byte order, with big endian word
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@ -114,7 +119,8 @@ const struct floatformat floatformat_ieee_double_littlebyte_bigword = |
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floatformat_littlebyte_bigword, 64, 0, 1, 11, 1023, 2047, 12, 52, |
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floatformat_intbit_no, |
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"floatformat_ieee_double_littlebyte_bigword", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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/* floatformat for VAX. Not quite IEEE, but close enough. */ |
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@ -124,21 +130,24 @@ const struct floatformat floatformat_vax_f = |
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floatformat_vax, 32, 0, 1, 8, 129, 0, 9, 23, |
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floatformat_intbit_no, |
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"floatformat_vax_f", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_vax_d = |
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{ |
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floatformat_vax, 64, 0, 1, 8, 129, 0, 9, 55, |
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floatformat_intbit_no, |
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"floatformat_vax_d", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_vax_g = |
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{ |
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floatformat_vax, 64, 0, 1, 11, 1025, 0, 12, 52, |
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floatformat_intbit_no, |
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"floatformat_vax_g", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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static int floatformat_i387_ext_is_valid (const struct floatformat *fmt, |
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@ -170,7 +179,8 @@ const struct floatformat floatformat_i387_ext = |
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floatformat_little, 80, 0, 1, 15, 0x3fff, 0x7fff, 16, 64, |
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floatformat_intbit_yes, |
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"floatformat_i387_ext", |
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floatformat_i387_ext_is_valid |
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floatformat_i387_ext_is_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_m68881_ext = |
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{ |
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@ -178,7 +188,8 @@ const struct floatformat floatformat_m68881_ext = |
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floatformat_big, 96, 0, 1, 15, 0x3fff, 0x7fff, 32, 64, |
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floatformat_intbit_yes, |
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"floatformat_m68881_ext", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_i960_ext = |
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{ |
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@ -186,14 +197,16 @@ const struct floatformat floatformat_i960_ext = |
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floatformat_little, 96, 16, 17, 15, 0x3fff, 0x7fff, 32, 64, |
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floatformat_intbit_yes, |
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"floatformat_i960_ext", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_m88110_ext = |
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{ |
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floatformat_big, 80, 0, 1, 15, 0x3fff, 0x7fff, 16, 64, |
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floatformat_intbit_yes, |
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"floatformat_m88110_ext", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_m88110_harris_ext = |
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{ |
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@ -202,7 +215,8 @@ const struct floatformat floatformat_m88110_harris_ext = |
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floatformat_big,128, 0, 1, 11, 0x3ff, 0x7ff, 12, 52, |
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floatformat_intbit_no, |
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"floatformat_m88110_ext_harris", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_arm_ext_big = |
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{ |
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@ -210,7 +224,8 @@ const struct floatformat floatformat_arm_ext_big = |
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floatformat_big, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64, |
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floatformat_intbit_yes, |
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"floatformat_arm_ext_big", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_arm_ext_littlebyte_bigword = |
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{ |
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@ -218,35 +233,138 @@ const struct floatformat floatformat_arm_ext_littlebyte_bigword = |
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floatformat_littlebyte_bigword, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64, |
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floatformat_intbit_yes, |
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"floatformat_arm_ext_littlebyte_bigword", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_ia64_spill_big = |
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{ |
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floatformat_big, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64, |
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floatformat_intbit_yes, |
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"floatformat_ia64_spill_big", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_ia64_spill_little = |
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{ |
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floatformat_little, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64, |
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floatformat_intbit_yes, |
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"floatformat_ia64_spill_little", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_ia64_quad_big = |
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{ |
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floatformat_big, 128, 0, 1, 15, 16383, 0x7fff, 16, 112, |
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floatformat_intbit_no, |
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"floatformat_ia64_quad_big", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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const struct floatformat floatformat_ia64_quad_little = |
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{ |
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floatformat_little, 128, 0, 1, 15, 16383, 0x7fff, 16, 112, |
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floatformat_intbit_no, |
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"floatformat_ia64_quad_little", |
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floatformat_always_valid |
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floatformat_always_valid, |
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NULL |
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}; |
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static int |
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floatformat_ibm_long_double_is_valid (const struct floatformat *fmt, |
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const void *from) |
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{ |
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const unsigned char *ufrom = (const unsigned char *) from; |
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const struct floatformat *hfmt = fmt->split_half; |
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long top_exp, bot_exp; |
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int top_nan = 0; |
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top_exp = get_field (ufrom, hfmt->byteorder, hfmt->totalsize, |
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hfmt->exp_start, hfmt->exp_len); |
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bot_exp = get_field (ufrom + 8, hfmt->byteorder, hfmt->totalsize, |
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hfmt->exp_start, hfmt->exp_len); |
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if (top_exp == hfmt->exp_nan) |
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top_nan = mant_bits_set (hfmt, ufrom); |
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/* A NaN is valid with any low part. */ |
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if (top_nan) |
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return 1; |
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/* An infinity, zero or denormal requires low part 0 (positive or
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negative). */ |
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if (top_exp == hfmt->exp_nan || top_exp == 0) |
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{ |
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unsigned int mant_bits, mant_off; |
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int mant_bits_left; |
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if (bot_exp != 0) |
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return 0; |
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return !mant_bits_set (hfmt, ufrom + 8); |
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} |
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/* The top part is now a finite normal value. The long double value
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is the sum of the two parts, and the top part must equal the |
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result of rounding the long double value to nearest double. Thus |
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the bottom part must be <= 0.5ulp of the top part in absolute |
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value, and if it is < 0.5ulp then the long double is definitely |
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valid. */ |
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if (bot_exp < top_exp - 53) |
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return 1; |
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if (bot_exp > top_exp - 53 && bot_exp != 0) |
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return 0; |
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if (bot_exp == 0) |
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{ |
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/* The bottom part is 0 or denormal. Determine which, and if
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denormal the first two set bits. */ |
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int first_bit = -1, second_bit = -1, cur_bit; |
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for (cur_bit = 0; cur_bit < hfmt->man_len; cur_bit++) |
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if (get_field (ufrom + 8, hfmt->byteorder, hfmt->totalsize, |
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hfmt->man_start + cur_bit, 1)) |
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{ |
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if (first_bit == -1) |
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first_bit = cur_bit; |
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else |
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{ |
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second_bit = cur_bit; |
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break; |
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} |
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} |
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/* Bottom part 0 is OK. */ |
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if (first_bit == -1) |
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return 1; |
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/* The real exponent of the bottom part is -first_bit. */ |
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if (-first_bit < top_exp - 53) |
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return 1; |
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if (-first_bit > top_exp - 53) |
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return 0; |
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/* The bottom part is at least 0.5ulp of the top part. For this
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to be OK, the bottom part must be exactly 0.5ulp (i.e. no |
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more bits set) and the top part must have last bit 0. */ |
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if (second_bit != -1) |
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return 0; |
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return !get_field (ufrom, hfmt->byteorder, hfmt->totalsize, |
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hfmt->man_start + hfmt->man_len - 1, 1); |
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} |
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else |
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{ |
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/* The bottom part is at least 0.5ulp of the top part. For this
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to be OK, it must be exactly 0.5ulp (i.e. no explicit bits |
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set) and the top part must have last bit 0. */ |
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if (get_field (ufrom, hfmt->byteorder, hfmt->totalsize, |
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hfmt->man_start + hfmt->man_len - 1, 1)) |
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return 0; |
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return !mant_bits_set (hfmt, ufrom + 8); |
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} |
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} |
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const struct floatformat floatformat_ibm_long_double = |
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{ |
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floatformat_big, 128, 0, 1, 11, 1023, 2047, 12, 52, |
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floatformat_intbit_no, |
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"floatformat_ibm_long_double", |
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floatformat_always_valid, |
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&floatformat_ieee_double_big |
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}; |
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@ -254,6 +372,30 @@ const struct floatformat floatformat_ia64_quad_little = |
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#define min(a, b) ((a) < (b) ? (a) : (b)) |
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#endif |
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/* Return 1 if any bits are explicitly set in the mantissa of UFROM,
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format FMT, 0 otherwise. */ |
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static int |
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mant_bits_set (const struct floatformat *fmt, const unsigned char *ufrom) |
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{ |
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unsigned int mant_bits, mant_off; |
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int mant_bits_left; |
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mant_off = fmt->man_start; |
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mant_bits_left = fmt->man_len; |
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while (mant_bits_left > 0) |
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{ |
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mant_bits = min (mant_bits_left, 32); |
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if (get_field (ufrom, fmt->byteorder, fmt->totalsize, |
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mant_off, mant_bits) != 0) |
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return 1; |
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mant_off += mant_bits; |
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mant_bits_left -= mant_bits; |
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} |
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return 0; |
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} |
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/* Extract a field which starts at START and is LEN bits long. DATA and
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TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */ |
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static unsigned long |
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@ -310,6 +452,10 @@ floatformat_to_double (const struct floatformat *fmt, |
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int mant_bits_left; |
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int special_exponent; /* It's a NaN, denorm or zero */ |
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/* Split values are not handled specially, since the top half has
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the correctly rounded double value (in the only supported case of |
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split values). */ |
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exponent = get_field (ufrom, fmt->byteorder, fmt->totalsize, |
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fmt->exp_start, fmt->exp_len); |
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@ -318,26 +464,7 @@ floatformat_to_double (const struct floatformat *fmt, |
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don't try to preserve the type of NaN. FIXME. */ |
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if ((unsigned long) exponent == fmt->exp_nan) |
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{ |
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int nan; |
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mant_off = fmt->man_start; |
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mant_bits_left = fmt->man_len; |
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nan = 0; |
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while (mant_bits_left > 0) |
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{ |
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mant_bits = min (mant_bits_left, 32); |
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if (get_field (ufrom, fmt->byteorder, fmt->totalsize, |
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mant_off, mant_bits) != 0) |
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{ |
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/* This is a NaN. */ |
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nan = 1; |
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break; |
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} |
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mant_off += mant_bits; |
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mant_bits_left -= mant_bits; |
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} |
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int nan = mant_bits_set (fmt, ufrom); |
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/* On certain systems (such as GNU/Linux), the use of the
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INFINITY macro below may generate a warning that can not be |
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@ -474,6 +601,10 @@ floatformat_from_double (const struct floatformat *fmt, |
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dfrom = *from; |
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memset (uto, 0, fmt->totalsize / FLOATFORMAT_CHAR_BIT); |
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/* Split values are not handled specially, since a bottom half of
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zero is correct for any value representable as double (in the |
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only supported case of split values). */ |
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/* If negative, set the sign bit. */ |
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if (dfrom < 0) |
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{ |
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Joseph Myers
19 years ago