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-rw-r--r--gas/config/atof-ieee.c37
-rw-r--r--gas/config/tc-arm.c96
-rw-r--r--gas/config/tc-arm.h4
3 files changed, 129 insertions, 8 deletions
diff --git a/gas/config/atof-ieee.c b/gas/config/atof-ieee.c
index 9bb9e55..944c8a4 100644
--- a/gas/config/atof-ieee.c
+++ b/gas/config/atof-ieee.c
@@ -26,6 +26,7 @@ extern FLONUM_TYPE generic_floating_point_number;
/* Precision in LittleNums. */
/* Don't count the gap in the m68k extended precision format. */
#define MAX_PRECISION 5
+#define H_PRECISION 1
#define F_PRECISION 2
#define D_PRECISION 4
#define X_PRECISION 5
@@ -190,6 +191,12 @@ atof_ieee (char *str, /* Text to convert to binary. */
switch (what_kind)
{
+ case 'h':
+ case 'H':
+ precision = H_PRECISION;
+ exponent_bits = 5;
+ break;
+
case 'f':
case 'F':
case 's':
@@ -283,8 +290,13 @@ gen_to_words (LITTLENUM_TYPE *words, int precision, long exponent_bits)
if (generic_floating_point_number.sign == 0)
{
if (TC_LARGEST_EXPONENT_IS_NORMAL (precision))
- as_warn (_("NaNs are not supported by this target\n"));
- if (precision == F_PRECISION)
+ as_warn (_("NaNs are not supported by this target"));
+
+ if (precision == H_PRECISION)
+ {
+ words[0] = 0x7fff;
+ }
+ else if (precision == F_PRECISION)
{
words[0] = 0x7fff;
words[1] = 0xffff;
@@ -322,10 +334,14 @@ gen_to_words (LITTLENUM_TYPE *words, int precision, long exponent_bits)
else if (generic_floating_point_number.sign == 'P')
{
if (TC_LARGEST_EXPONENT_IS_NORMAL (precision))
- as_warn (_("Infinities are not supported by this target\n"));
+ as_warn (_("Infinities are not supported by this target"));
/* +INF: Do the right thing. */
- if (precision == F_PRECISION)
+ if (precision == H_PRECISION)
+ {
+ words[0] = 0x7c00;
+ }
+ else if (precision == F_PRECISION)
{
words[0] = 0x7f80;
words[1] = 0;
@@ -363,10 +379,14 @@ gen_to_words (LITTLENUM_TYPE *words, int precision, long exponent_bits)
else if (generic_floating_point_number.sign == 'N')
{
if (TC_LARGEST_EXPONENT_IS_NORMAL (precision))
- as_warn (_("Infinities are not supported by this target\n"));
+ as_warn (_("Infinities are not supported by this target"));
/* Negative INF. */
- if (precision == F_PRECISION)
+ if (precision == H_PRECISION)
+ {
+ words[0] = 0xfc00;
+ }
+ else if (precision == F_PRECISION)
{
words[0] = 0xff80;
words[1] = 0x0;
@@ -721,6 +741,11 @@ ieee_md_atof (int type,
{
switch (type)
{
+ case 'H':
+ case 'h':
+ prec = H_PRECISION;
+ break;
+
case 'f':
case 'F':
case 's':
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index f7bebc1..714121b 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -1037,7 +1037,7 @@ const char EXP_CHARS[] = "eE";
/* As in 0f12.456 */
/* or 0d1.2345e12 */
-const char FLT_CHARS[] = "rRsSfFdDxXeEpP";
+const char FLT_CHARS[] = "rRsSfFdDxXeEpPHh";
/* Prefix characters that indicate the start of an immediate
value. */
@@ -1047,6 +1047,16 @@ const char FLT_CHARS[] = "rRsSfFdDxXeEpP";
#define skip_whitespace(str) do { if (*(str) == ' ') ++(str); } while (0)
+enum fp_16bit_format
+{
+ ARM_FP16_FORMAT_IEEE = 0x1,
+ ARM_FP16_FORMAT_ALTERNATIVE = 0x2,
+ ARM_FP16_FORMAT_DEFAULT = 0x3
+};
+
+static enum fp_16bit_format fp16_format = ARM_FP16_FORMAT_DEFAULT;
+
+
static inline int
skip_past_char (char ** str, char c)
{
@@ -1188,6 +1198,11 @@ md_atof (int type, char * litP, int * sizeP)
switch (type)
{
+ case 'H':
+ case 'h':
+ prec = 1;
+ break;
+
case 'f':
case 'F':
case 's':
@@ -4925,6 +4940,55 @@ pe_directive_secrel (int dummy ATTRIBUTE_UNUSED)
}
#endif /* TE_PE */
+int
+arm_is_largest_exponent_ok (int precision)
+{
+ /* precision == 1 ensures that this will only return
+ true for 16 bit floats. */
+ return (precision == 1) && (fp16_format == ARM_FP16_FORMAT_ALTERNATIVE);
+}
+
+static void
+set_fp16_format (int dummy ATTRIBUTE_UNUSED)
+{
+ char saved_char;
+ char* name;
+ enum fp_16bit_format new_format;
+
+ new_format = ARM_FP16_FORMAT_DEFAULT;
+
+ name = input_line_pointer;
+ while (*input_line_pointer && !ISSPACE (*input_line_pointer))
+ input_line_pointer++;
+
+ saved_char = *input_line_pointer;
+ *input_line_pointer = 0;
+
+ if (strcasecmp (name, "ieee") == 0)
+ new_format = ARM_FP16_FORMAT_IEEE;
+ else if (strcasecmp (name, "alternative") == 0)
+ new_format = ARM_FP16_FORMAT_ALTERNATIVE;
+ else
+ {
+ as_bad (_("unrecognised float16 format \"%s\""), name);
+ goto cleanup;
+ }
+
+ /* Only set fp16_format if it is still the default (aka not already
+ been set yet). */
+ if (fp16_format == ARM_FP16_FORMAT_DEFAULT)
+ fp16_format = new_format;
+ else
+ {
+ if (new_format != fp16_format)
+ as_warn (_("float16 format cannot be set more than once, ignoring."));
+ }
+
+cleanup:
+ *input_line_pointer = saved_char;
+ ignore_rest_of_line ();
+}
+
/* This table describes all the machine specific pseudo-ops the assembler
has to support. The fields are:
pseudo-op name without dot
@@ -5002,9 +5066,12 @@ const pseudo_typeS md_pseudo_table[] =
{"asmfunc", s_ccs_asmfunc, 0},
{"endasmfunc", s_ccs_endasmfunc, 0},
+ {"float16", float_cons, 'h' },
+ {"float16_format", set_fp16_format, 0 },
+
{ 0, 0, 0 }
};
-
+
/* Parser functions used exclusively in instruction operands. */
/* Generic immediate-value read function for use in insn parsing.
@@ -31240,6 +31307,22 @@ arm_parse_extension (const char *str, const arm_feature_set *opt_set,
}
static bfd_boolean
+arm_parse_fp16_opt (const char *str)
+{
+ if (strcasecmp (str, "ieee") == 0)
+ fp16_format = ARM_FP16_FORMAT_IEEE;
+ else if (strcasecmp (str, "alternative") == 0)
+ fp16_format = ARM_FP16_FORMAT_ALTERNATIVE;
+ else
+ {
+ as_bad (_("unrecognised float16 format \"%s\""), str);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static bfd_boolean
arm_parse_cpu (const char *str)
{
const struct arm_cpu_option_table *opt;
@@ -31430,6 +31513,12 @@ struct arm_long_option_table arm_long_opts[] =
arm_parse_it_mode, NULL},
{"mccs", N_("\t\t\t TI CodeComposer Studio syntax compatibility mode"),
arm_ccs_mode, NULL},
+ {"mfp16-format=",
+ N_("[ieee|alternative]\n\
+ set the encoding for half precision floating point "
+ "numbers to IEEE\n\
+ or Arm alternative format."),
+ arm_parse_fp16_opt, NULL },
{NULL, NULL, 0, NULL}
};
@@ -32011,6 +32100,9 @@ aeabi_set_public_attributes (void)
virt_sec |= 2;
if (virt_sec != 0)
aeabi_set_attribute_int (Tag_Virtualization_use, virt_sec);
+
+ if (fp16_format != ARM_FP16_FORMAT_DEFAULT)
+ aeabi_set_attribute_int (Tag_ABI_FP_16bit_format, fp16_format);
}
/* Post relaxation hook. Recompute ARM attributes now that relaxation is
diff --git a/gas/config/tc-arm.h b/gas/config/tc-arm.h
index 39cc968..8a73beb 100644
--- a/gas/config/tc-arm.h
+++ b/gas/config/tc-arm.h
@@ -385,3 +385,7 @@ extern char arm_line_separator_chars[];
#define TC_EQUAL_IN_INSN(c, s) arm_tc_equal_in_insn ((c), (s))
extern bfd_boolean arm_tc_equal_in_insn (int, char *);
+
+#define TC_LARGEST_EXPONENT_IS_NORMAL(PRECISION) \
+ arm_is_largest_exponent_ok ((PRECISION))
+int arm_is_largest_exponent_ok (int precision);
generated by cgit v1.1 at 2024-12-20 14:39:27 +0000