From: Pierre-Marie de Rodat <derodat@adacore.com>
To: gcc-patches@gcc.gnu.org
Cc: Eric Botcazou <ebotcazou@adacore.com>
Subject: [Ada] Fix minor issue in Scan_Decimal_Digits
Date: Thu, 29 Apr 2021 04:03:47 -0400 [thread overview]
Message-ID: <20210429080347.GA134022@adacore.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 337 bytes --]
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.
[-- Attachment #2: patch.diff --]
[-- Type: text/x-diff, Size: 1321 bytes --]
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)
reply other threads:[~2021-04-29 8:03 UTC|newest]
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