The Extra digit is not correctly set when the precision limit is reached
by means of trailing zeros.
Tested on x86_64-pc-linux-gnu, committed on trunk
gcc/ada/
* libgnat/s-valuer.adb (Scan_Decimal_Digits): Set Extra to zero
when the precision limit is reached by means of trailing zeros
and prevent it from being overwritten later.diff --git a/gcc/ada/libgnat/s-valuer.adb b/gcc/ada/libgnat/s-valuer.adb
--- a/gcc/ada/libgnat/s-valuer.adb
+++ b/gcc/ada/libgnat/s-valuer.adb
@@ -261,7 +261,11 @@ package body System.Value_R is
Scale := Scale - 1;
else
+ Extra := 0;
Precision_Limit_Reached := True;
+ if Round and then J = Trailing_Zeros then
+ Round_Extra (Digit, Value, Scale, Extra, Base);
+ end if;
exit;
end if;
end loop;
@@ -274,11 +278,16 @@ package body System.Value_R is
Temp := Value * Uns (Base) + Uns (Digit);
+ -- Precision_Limit_Reached may have been set above
+
+ if Precision_Limit_Reached then
+ null;
+
-- Check if Temp is larger than Precision_Limit, taking into
-- account that Temp may wrap around when Precision_Limit is
-- equal to the largest integer.
- if Value <= Umax
+ elsif Value <= Umax
or else (Value <= UmaxB
and then ((Precision_Limit < Uns'Last
and then Temp <= Precision_Limit)
