Adjust __MATH_EVAL_FMT2 definition to handle _Float16 better.

Continuing the preparation for additional _FloatN / _FloatNx type
support, this patch adds an additional case in the definition of
__MATH_EVAL_FMT2, as used in defining iseqsig: when
__FLT_EVAL_METHOD__ is 0 or 32, it adds 0.0f to the arguments, so that
the correct function would be selected in the case of _Float16
arguments with excess precision (were glibc to support _Float16, which
of course __MATH_TG and other facilities do not at present - and
_Float16 support is not part of what this patch series is aiming for,
but this particular fix is simple so is included anyway).

Tested for x86_64.

	* math/math.h
	[__FLT_EVAL_METHOD__ == 0 || __FLT_EVAL_METHOD__ == 32]
	(__MATH_EVAL_FMT2): Define to add 0.0f.

1 files changed, 2 insertions, 0 deletions

diff --git a/math/math.h b/math/math.h
index 125d845c86..326fd8ebe1 100644
--- a/math/math.h
+++ b/math/math.h
@@ -1144,6 +1144,8 @@ iszero (__T __val)
 #  define __MATH_EVAL_FMT2(x, y) ((x) + (y) + 0.0L)
 # elif __FLT_EVAL_METHOD__ == 1 || __FLT_EVAL_METHOD__ > 32
 #  define __MATH_EVAL_FMT2(x, y) ((x) + (y) + 0.0)
+# elif __FLT_EVAL_METHOD__ == 0 || __FLT_EVAL_METHOD__ == 32
+#  define __MATH_EVAL_FMT2(x, y) ((x) + (y) + 0.0f)
 # else
 #  define __MATH_EVAL_FMT2(x, y) ((x) + (y))
 # endif