aboutsummaryrefslogtreecommitdiff
path: root/gas/config
diff options
context:
space:
mode:
authorJan Beulich <jbeulich@suse.com>2021-08-11 08:33:49 +0200
committerJan Beulich <jbeulich@suse.com>2021-08-11 08:33:49 +0200
commitde133cf98cdf4cb3d1461ef10c83ce72df7399c7 (patch)
tree1ea3411b55f5020dcd47dbb71523a872338d4d6d /gas/config
parent7d19d096292acac01d0fde4d99c3e49d69688e03 (diff)
downloadgdb-de133cf98cdf4cb3d1461ef10c83ce72df7399c7.zip
gdb-de133cf98cdf4cb3d1461ef10c83ce72df7399c7.tar.gz
gdb-de133cf98cdf4cb3d1461ef10c83ce72df7399c7.tar.bz2
x86: introduce .bfloat16 directive
This is to be able to generate data acted upon by AVX512-BF16 and AMX-BF16 insns. While not part of the IEEE standard, the format is sufficiently standardized to warrant handling in config/atof-ieee.c. Arm, where custom handling was implemented, may want to leverage this as well. To be able to also use the hex forms supported for other floating point formats, a small addition to the generic hex_float() is needed. Extend existing x86 testcases.
Diffstat (limited to 'gas/config')
-rw-r--r--gas/config/atof-ieee.c20
-rw-r--r--gas/config/tc-i386.c3
2 files changed, 18 insertions, 5 deletions
diff --git a/gas/config/atof-ieee.c b/gas/config/atof-ieee.c
index e6e8879..7f95d05 100644
--- a/gas/config/atof-ieee.c
+++ b/gas/config/atof-ieee.c
@@ -27,6 +27,7 @@ extern FLONUM_TYPE generic_floating_point_number;
/* Don't count the gap in the m68k extended precision format. */
#define MAX_PRECISION 5
#define H_PRECISION 1
+#define B_PRECISION 1 /* Not strictly IEEE, but handled here anyway. */
#define F_PRECISION 2
#define D_PRECISION 4
#define X_PRECISION 5
@@ -243,6 +244,12 @@ atof_ieee (char *str, /* Text to convert to binary. */
exponent_bits = 5;
break;
+ case 'b':
+ case 'B':
+ precision = B_PRECISION;
+ exponent_bits = 8;
+ break;
+
case 'f':
case 'F':
case 's':
@@ -368,9 +375,9 @@ gen_to_words (LITTLENUM_TYPE *words, int precision, long exponent_bits)
as_warn (_("Infinities are not supported by this target"));
/* +INF: Do the right thing. */
- if (precision == H_PRECISION)
+ if (precision == H_PRECISION /* also B_PRECISION */)
{
- words[0] = 0x7c00;
+ words[0] = exponent_bits == 5 ? 0x7c00 : 0x7f80;
}
else if (precision == F_PRECISION)
{
@@ -413,9 +420,9 @@ gen_to_words (LITTLENUM_TYPE *words, int precision, long exponent_bits)
as_warn (_("Infinities are not supported by this target"));
/* Negative INF. */
- if (precision == H_PRECISION)
+ if (precision == H_PRECISION /* also B_PRECISION */)
{
- words[0] = 0xfc00;
+ words[0] = exponent_bits == 5 ? 0xfc00 : 0xff80;
}
else if (precision == F_PRECISION)
{
@@ -777,6 +784,11 @@ ieee_md_atof (int type,
prec = H_PRECISION;
break;
+ case 'B':
+ case 'b':
+ prec = B_PRECISION;
+ break;
+
case 'f':
case 'F':
case 's':
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index a9e3621..dc29fa2 100644
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -512,7 +512,7 @@ const char EXP_CHARS[] = "eE";
/* Chars that mean this number is a floating point constant
As in 0f12.456
or 0d1.2345e12. */
-const char FLT_CHARS[] = "fFdDxXhH";
+const char FLT_CHARS[] = "fFdDxXhHbB";
/* Tables for lexical analysis. */
static char mnemonic_chars[256];
@@ -1357,6 +1357,7 @@ const pseudo_typeS md_pseudo_table[] =
{"dfloat", float_cons, 'd'},
{"tfloat", float_cons, 'x'},
{"hfloat", float_cons, 'h'},
+ {"bfloat16", float_cons, 'b'},
{"value", cons, 2},
{"slong", signed_cons, 4},
{"noopt", s_ignore, 0},