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Zhendong_Su
Beginner
84 Views

icc 17.0.0 miscompiles valid C code at -Os, -O2 and -O3 on x86_64-linux-gnu

Compiler version and platform: 

Intel(R) C Intel(R) 64 Compiler for applications running on Intel(R) 64, Version 17.0.0.098 Build 20160721

$ icc -O1 small.c; ./a.out
$    
$ icc -Os small.c
$ timeout -s 9 10 ./a.out
Killed
$ 
$ cat small.c
char a, b = 1;

int main ()
{
  for (; a < 1; a++)
    for (; b; b++)
      ;
  return 0; 
}
$ 

 

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2 Replies
Melanie_B_Intel
Employee
84 Views

I added this test case to (internal bug tracking number) DPD200415454.  it looks like the same bug.  Thank you.

Zhendong_Su
Beginner
84 Views

Thank you, Melanie.  

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