[Bug c++/37800] New: decrementation problem - different result in similar situations

[terrix at wp dot pl]

compiled with no any special arguments: g++-4.2 test.cpp
operating system: Linux/Debian 4 (lenny)

problem:
foo(++i, i-1);

i've read non-bugs, but there was no exacly about my situation.

example code:

#include <stdio.h>

void func(int* a, int* b) {
        printf("%d %d\n", *a, *b);
}

int main() {
        int foo[]={1,2,3};
        int *p;


        p = foo + 1;    // set pointer to point at '2'
        func(++p, p);   // result: 3 3 (same at msvc and same as gcc)
                        // OK

        p = foo + 1;
        func(++p, p - 1); // result at msvc: 3 2., result at gcc: 3 1
                          // BAD: p variable at second argument isn't yet 
                          // incremented
}

cheers, Mark


-- 
           Summary: decrementation problem - different result in similar
                    situations
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: terrix at wp dot pl


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37800