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Diffstat (limited to 'src/q.tex')
| -rw-r--r-- | src/q.tex | 10 |
1 files changed, 4 insertions, 6 deletions
@@ -7,6 +7,10 @@ arithmetic standard. The 128-bit or quad-precision binary floating-point instruction subset is named ``Q'', and requires RV64IFD. The floating-point registers are now extended to hold either a single, double, or quad-precision floating-point value (FLEN=128). +The NaN-boxing scheme described in Section~\ref{nanboxing} is now +extended recursively to allow a single-precision value to be NaN-boxed +inside a double-precision value which is itself NaN-boxed inside a +quad-precision value. \section{Quad-Precision Load and Store Instructions} @@ -57,12 +61,6 @@ offset[11:5] & src & base & Q & offset[4:0] & STORE-FP \\ \end{tabular} \end{center} -If a floating-point register holds a single-precision or -double-precision value, it is guaranteed that a FSQ of that register -will place a value into memory that when reloaded with a FLQ will -recreate the original value in a register. The data format that is -stored in memory is undefined beyond having this property. - FLQ and FSQ are only guaranteed to execute atomically if the effective address is naturally aligned and XLEN=128. |