floatformat.h: Add bfloat16 support.

This change is motivated by a patchset that adds bfloat16 debugging
support for new avx512 instructions to GDB. The gdb thread can be found
here: https://sourceware.org/pipermail/gdb-patches/2020-July/170820.html

include:
2020-08-17  Felix Willgerodt  <felix.willgerodt@intel.com>

	* floatformat.h (floatformat_bfloat16_big): New.
	(floatformat_bfloat16_little): New.

libiberty:
2020-08-17  Felix Willgerodt  <felix.willgerodt@intel.com>

	* floatformat.c (floatformat_bfloat16_big): New.
	(floatformat_bfloat16_little): New.

diff --git a/include/floatformat.h b/include/floatformat.h
index ce8d6d4..630fade 100644 (file)
--- a/include/floatformat.h
+++ b/include/floatformat.h
@@ -133,6 +133,9 @@ extern const struct floatformat floatformat_ia64_quad_little;
 /* IBM long double (double+double).  */
 extern const struct floatformat floatformat_ibm_long_double_big;
 extern const struct floatformat floatformat_ibm_long_double_little;
+/* bfloat16.  */
+extern const struct floatformat floatformat_bfloat16_big;
+extern const struct floatformat floatformat_bfloat16_little;
 
 /* Convert from FMT to a double.
    FROM is the address of the extended float.

diff --git a/libiberty/floatformat.c b/libiberty/floatformat.c
index 2fd5e68..6b9b032 100644 (file)
--- a/libiberty/floatformat.c
+++ b/libiberty/floatformat.c
@@ -389,7 +389,24 @@ const struct floatformat floatformat_ibm_long_double_little =
   floatformat_ibm_long_double_is_valid,
   &floatformat_ieee_double_little
 };
-\f
+
+const struct floatformat floatformat_bfloat16_big =
+{
+  floatformat_big, 16, 0, 1, 8, 127, 255, 9, 7,
+  floatformat_intbit_no,
+  "floatformat_bfloat16_big",
+  floatformat_always_valid,
+  NULL
+};
+
+const struct floatformat floatformat_bfloat16_little =
+{
+  floatformat_little, 16, 0, 1, 8, 127, 255, 9, 7,
+  floatformat_intbit_no,
+  "floatformat_bfloat16_little",
+  floatformat_always_valid,
+  NULL
+};
 
 #ifndef min
 #define min(a, b) ((a) < (b) ? (a) : (b))