It is only documented for static computations currently.
Tested on x86_64-pc-linux-gnu, committed on trunk
gcc/ada/
* doc/gnat_rm/implementation_defined_characteristics.rst: Document
the rounding mode assumed for dynamic computations as per 3.5.7(16).
* gnat_rm.texi: Regenerate.diff --git a/gcc/ada/doc/gnat_rm/implementation_defined_characteristics.rst b/gcc/ada/doc/gnat_rm/implementation_defined_characteristics.rst
--- a/gcc/ada/doc/gnat_rm/implementation_defined_characteristics.rst
+++ b/gcc/ada/doc/gnat_rm/implementation_defined_characteristics.rst
@@ -147,12 +147,12 @@ Type Representation
IEEE 80-bit Extended on x86 architecture
====================== ===============================================
-The default rounding mode specified by the IEEE 754 Standard is assumed for
-static computations, i.e. round to nearest, ties to even. The input routines
-yield correctly rounded values for Short_Float, Float and Long_Float at least.
-The output routines can compute up to twice as many exact digits as the value
-of ``T'Digits`` for any type, for example 30 digits for Long_Float; if more
-digits are requested, zeros are printed.
+The default rounding mode specified by the IEEE 754 Standard is assumed both
+for static and dynamic computations (that is, round to nearest, ties to even).
+The input routines yield correctly rounded values for Short_Float, Float, and
+Long_Float at least. The output routines can compute up to twice as many exact
+digits as the value of ``T'Digits`` for any type, for example 30 digits for
+Long_Float; if more digits are requested, zeros are printed.
*
"The small of an ordinary fixed point type. See 3.5.9(8)."
diff --git a/gcc/ada/gnat_rm.texi b/gcc/ada/gnat_rm.texi
--- a/gcc/ada/gnat_rm.texi
+++ b/gcc/ada/gnat_rm.texi
@@ -21,7 +21,7 @@
@copying
@quotation
-GNAT Reference Manual , Aug 03, 2021
+GNAT Reference Manual , Sep 28, 2021
AdaCore
@@ -15939,12 +15939,12 @@ IEEE 80-bit Extended on x86 architecture
@end multitable
-The default rounding mode specified by the IEEE 754 Standard is assumed for
-static computations, i.e. round to nearest, ties to even. The input routines
-yield correctly rounded values for Short_Float, Float and Long_Float at least.
-The output routines can compute up to twice as many exact digits as the value
-of @code{T'Digits} for any type, for example 30 digits for Long_Float; if more
-digits are requested, zeros are printed.
+The default rounding mode specified by the IEEE 754 Standard is assumed both
+for static and dynamic computations (that is, round to nearest, ties to even).
+The input routines yield correctly rounded values for Short_Float, Float, and
+Long_Float at least. The output routines can compute up to twice as many exact
+digits as the value of @code{T'Digits} for any type, for example 30 digits for
+Long_Float; if more digits are requested, zeros are printed.
@itemize *
