DynamoRIO/drmemory
View on GitHubFloating point result differs after throwing an exception
Open
#2,117 opened on Aug 31, 2018
Bug-AppFailOpSys-Windowshelp wanted
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Description
The following little program (compiled with VS2008) shows, that the result of floating point calculation differs after throwing an exception running under drmemory version 1.11.*, with version 1.8.0 the result is ok:
#include <iostream>
int main()
{
short sRc = 2;
double dTest = 0.0175;
printf("result before exception: %19.17f\n",1./(1.+dTest));
try
{
if (sRc!=0)
throw std::invalid_argument("Test");
}
catch (std::invalid_argument &)
{
printf("result after exception: %19.17f\n",1./(1.+dTest));
return 0;
}
}
>C:\old\DrMemory\bin\drmemory.exe -batch -- buctr
~~Dr.M~~ Dr. Memory version 1.11.17622
~~Dr.M~~ Running "buctr"
result before exception: 0.98280098280098271
result after exception: 0.98280098280098283
~~Dr.M~~
~~Dr.M~~ NO ERRORS FOUND:
~~Dr.M~~ 0 unique, 0 total unaddressable access(es)
~~Dr.M~~ 0 unique, 0 total uninitialized access(es)
~~Dr.M~~ 0 unique, 0 total invalid heap argument(s)
~~Dr.M~~ 0 unique, 0 total GDI usage error(s)
~~Dr.M~~ 0 unique, 0 total handle leak(s)
~~Dr.M~~ 0 unique, 0 total warning(s)
~~Dr.M~~ 0 unique, 0 total, 0 byte(s) of leak(s)
~~Dr.M~~ 0 unique, 0 total, 0 byte(s) of possible leak(s)
~~Dr.M~~ ERRORS IGNORED:
~~Dr.M~~ 2 unique, 2 total, 4110 byte(s) of still-reachable allocation(s)
~~Dr.M~~ (re-run with "-show_reachable" for details)
~~Dr.M~~ Details: C:\old\DrMemory\drmemory\logs\DrMemory-buctr.exe.16964.000\results.txt
>C:\old\DrMemory\bin\drmemory.exe -batch -- buctr.exe
~~Dr.M~~ Dr. Memory version 1.8.0
~~Dr.M~~ Running "h:\nix\buctr.exe"
result before exception: 0.98280098280098271
result after exception: 0.98280098280098271
~~Dr.M~~
~~Dr.M~~ NO ERRORS FOUND:
~~Dr.M~~ 0 unique, 0 total unaddressable access(es)
~~Dr.M~~ 0 unique, 0 total uninitialized access(es)
~~Dr.M~~ 0 unique, 0 total invalid heap argument(s)
~~Dr.M~~ 0 unique, 0 total GDI usage error(s)
~~Dr.M~~ 0 unique, 0 total handle leak(s)
~~Dr.M~~ 0 unique, 0 total warning(s)
~~Dr.M~~ 0 unique, 0 total, 0 byte(s) of leak(s)
~~Dr.M~~ 0 unique, 0 total, 0 byte(s) of possible leak(s)
~~Dr.M~~ ERRORS IGNORED:
~~Dr.M~~ 0 unique, 0 total, 0 byte(s) of still-reachable allocation(s)
~~Dr.M~~ (re-run with "-show_reachable" for details)
~~Dr.M~~ Details: C:\old\DrMemory\drmemory\logs\DrMemory-buctr.exe.7032.015\results.txt