FIX: Bad Code Is Generated When the Result of an Intrinsic Passed to Function

• Microsoft Visual C++, 32-bit Editions, version 6.0

SYMPTOMS

Bad code is generated when you pass the return value of an intrinsic function as an argument to a function that takes a reference to an integer while using Global Optimizations (/Og) and Enable Intrinsic Functions (/Oi). In some situations, a C1001 compiler error occurs:

fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'E:\8168\vc98\p2\src\P2\main.c', line 494)

RESOLUTION

There are two workaround options:

• WORKAROUND #1: Disable intrinsic optimizations. Add /Oi- to your compiler switches after any other switches that start with /O.


- OR -


• WORKAROUND #2: Use #pragma function to prevent the use of individual intrinsic functions.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

This bug was corrected in Visual Studio 6.0 Service Pack 3. For more information about Visual Studio service packs, please see the following articles in the Microsoft Knowledge Base:

Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed

MORE INFORMATION

Steps to Reproduce Behavior

#include <stdio.h>
#include <math.h>

int f(const int &a, const int &b) {
   return a * b;
}

// uncomment for workaround #2 to disable the abs intrinsic
// #pragma function(abs)

int main() {

   int x = -45, y = 2;

   // The result of abs(), an intrinsic, gets passed to 
   // a fn that takes arg of type reference to int
   printf("Result of f() is %i\n", f(abs(x), y));

   return 0;
}

// uncomment for workaround #2 to re-enable the abs intrinsic
// #pragma intrinsic(abs) 

Additional query words:

Keywords          : kbservicepack kbCompiler kbVC600bug kbVC600fix kbVS600sp2 kbVS600SP1 kbVS600sp3fix 
Version           : winnt:6.0
Platform          : winnt 
Issue type        : kbbug 

Last Reviewed: June 30, 1999