diff options
Diffstat (limited to 'gas/config/tc-aarch64.c')
| -rw-r--r-- | gas/config/tc-aarch64.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/gas/config/tc-aarch64.c b/gas/config/tc-aarch64.c index 527d8590ca7..eea863b9a43 100644 --- a/gas/config/tc-aarch64.c +++ b/gas/config/tc-aarch64.c @@ -635,6 +635,54 @@ my_get_expression (expressionS * ep, char **str, int prefix_mode, const char * md_atof (int type, char *litP, int *sizeP) { + /* If this is a bfloat16 type, then parse it slightly differently - + as it does not follow the IEEE standard exactly. */ + if (type == 'b') + { + char * t; + LITTLENUM_TYPE words[MAX_LITTLENUMS]; + FLONUM_TYPE generic_float; + + t = atof_ieee_detail (input_line_pointer, 1, 8, words, &generic_float); + + if (t) + input_line_pointer = t; + else + return _("invalid floating point number"); + + switch (generic_float.sign) + { + /* Is +Inf. */ + case 'P': + words[0] = 0x7f80; + break; + + /* Is -Inf. */ + case 'N': + words[0] = 0xff80; + break; + + /* Is NaN. */ + /* bfloat16 has two types of NaN - quiet and signalling. + Quiet NaN has bit[6] == 1 && faction != 0, whereas + signalling Nan's have bit[0] == 0 && fraction != 0. + Chose this specific encoding as it is the same form + as used by other IEEE 754 encodings in GAS. */ + case 0: + words[0] = 0x7fff; + break; + + default: + break; + } + + *sizeP = 2; + + md_number_to_chars (litP, (valueT) words[0], sizeof (LITTLENUM_TYPE)); + + return NULL; + } + return ieee_md_atof (type, litP, sizeP, target_big_endian); } @@ -2107,6 +2155,7 @@ const pseudo_typeS md_pseudo_table[] = { {"variant_pcs", s_variant_pcs, 0}, #endif {"float16", float_cons, 'h'}, + {"bfloat16", float_cons, 'b'}, {0, 0, 0} }; |