This provides correct rounding in the IEEE 754 sense for the Value attribute of floating-point types in more cases, by bumping the number of significant bits used in the initial integer mantissa obtained from parsing.
Tested on x86_64-pc-linux-gnu, committed on trunk
gcc/ada/
* libgnat/s-valuer.ads (System.Value_R): Add Parts formal parameter
as well as Data_Index, Scale_Array and Value_Array types.
(Scan_Raw_Real): Change type of Scale and return type.
(Value_Raw_Real): Likewise.
* libgnat/s-valuer.adb (Round_Extra): Reorder parameters and adjust
recursive call.
(Scan_Decimal_Digits): Reorder parameters, add N parameter and deal
with multi-part scale and value.
(Scan_Integral_Digits): Likewise.
(Scan_Raw_Real): Change type of Scale and return type and deal with
multi-part scale and value.
(Value_Raw_Real): Change type of Scale and return type and tidy up.
* libgnat/s-valued.adb (Impl): Pass 1 as Parts actual parameter.
(Scan_Decimal): Adjust to type changes.
(Value_Decimal): Likewise.
* libgnat/s-valuef.adb (Impl): Pass 1 as Parts actual parameter.
(Scan_Fixed): Adjust to type changes.
(Value_Fixed): Likewise.
* libgnat/s-valrea.adb (Need_Extra): Delete.
(Precision_Limit): Always use the precision of the mantissa.
(Impl): Pass 2 as Parts actual parameter.
(Exact_Log2): New expression function.
(Integer_to_Real): Change type of Scale and Val and deal with a
2-part integer mantissa.
(Scan_Real): Adjust to type changes.
(Value_Real): Likewise.
patch.diff.gz
Description: application/gzip
