BUG: You receive a "fatal error C1001" error message when you pass the return value of an intrinsic function as an argument to another function in Visual C++ 6.0

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This article was previously published under Q217164

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)

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

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STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section. This bug was corrected in Visual Studio 6.0 Service Pack 3.

For more information about Visual Studio service packs, click the following article numbers to view the articles in the Microsoft Knowledge Base:

194022 (http://support.microsoft.com/kb/194022/ ) Visual Studio 6.0 service packs, what, where, why

194295 (http://support.microsoft.com/kb/194295/ ) How to tell that a Visual Studio service pack is installed

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MORE INFORMATION

Steps to reproduce the behavior

Compile options: /Og /Oi or /O2
Workaround 1 compile options: /O2 /Oi-

#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)

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