[Bug tree-optimization/26939] loop number of iterations analysis not working

[dimhen at gmail dot com]

------- Comment #24 from dimhen at gmail dot com  2010-07-18 12:56 -------
is this the same problem? -- 'i*2 < 35' can't overflow

void
foo(char *ptr, unsigned size)
{
    unsigned i;
    for(i=0; i*2 < size && i*2 < 35; i++ ) {
        *ptr++ = 0;
    }
}

# gcc -Wunsafe-loop-optimizations  -O3 -c unsafe_loop.c
unsafe_loop.c: In function ‘foo’:
unsafe_loop.c:5:5: warning: cannot optimize loop, the loop counter may overflow
[-Wunsafe-loop-optimizations]

gcc/x86/[trunk revision 162274]


-- 

dimhen at gmail dot com changed:

           What    |Removed                     |Added
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                 CC|                            |dimhen at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26939