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The following archive was created by hippie-mail 7.98617-22 on Thu May 27 1999 - 23:44:22
Olivier Langlois (olanglois@sympatico.ca)
Thu, 22 Apr 1999 17:52:37 -0400
Hi,
For the following function
unsigned test( unsigned i, unsigned j )
{
return (i*i)%j;
}
my compiler generate the following assembler code
mov eax, DWORD PTR _i$[esp-4]
xor edx, edx
imul eax, eax
div DWORD PTR _j$[esp-4]
mov eax, edx
The problem is that an overflow can occur during the multiplication while
with this code
mov edx, DWORD PTR _i$[esp-4]
mul edx
div DWORD PTR _j$[esp-4]
mov eax, edx
The function would return a valid value for any value of i.
My question is : Is it possible to write a legal C construction to would
generate the correct assembler code ?
Olivier Langlois - olanglois@sympatico.ca -
http://www3.sympatico.ca/olanglois
Electrical Engineering Student
École de Technologie Supérieure - http://www.etsmtl.ca
Montreal, Canada
The following archive was created by hippie-mail 7.98617-22 on Thu May 27 1999 - 23:44:22