[gcc r13-3001] Document -fexcess-precision=16 in tm.texi

[gcc r13-3001] Document -fexcess-precision=16 in tm.texi

[Palmer Dabbelt]

https://gcc.gnu.org/g:4dcd340ebaae8213eeae89894b5ecdf61b0eb100

commit r13-3001-g4dcd340ebaae8213eeae89894b5ecdf61b0eb100
Author: Palmer Dabbelt <palmer@rivosinc.com>
Date:   Fri Sep 9 02:46:40 2022 -0700

    Document -fexcess-precision=16 in tm.texi
    
    I just happened to stuble on this one while trying to sort out the
    RISC-V bits.
    
    gcc/ChangeLog
    
            * doc/tm.texi (TARGET_C_EXCESS_PRECISION): Add 16.

Diff:
---
 gcc/doc/tm.texi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 858bfb80cec..7590924f2ca 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -1009,7 +1009,7 @@ of the excess precision explicitly added.  For
 @code{EXCESS_PRECISION_TYPE_FLOAT16}, and
 @code{EXCESS_PRECISION_TYPE_FAST}, the target should return the
 explicit excess precision that should be added depending on the
-value set for @option{-fexcess-precision=@r{[}standard@r{|}fast@r{]}}.
+value set for @option{-fexcess-precision=@r{[}standard@r{|}fast@r{|}16@r{]}}.
 Note that unpredictable explicit excess precision does not make sense,
 so a target should never return @code{FLT_EVAL_METHOD_UNPREDICTABLE}
 when @var{type} is @code{EXCESS_PRECISION_TYPE_STANDARD},