Viewing file:  uninit-28-gimple.c (1.02 KB) -rw-r--r--
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/* { dg-do compile } */
/* { dg-options "-fgimple -O -Wmaybe-uninitialized" } */
unsigned int __GIMPLE (ssa,startwith("uninit1"))
foo (unsigned int v)
{
/* Uninit warning here would be bogus, because (16 & 3) == 0 and therefore
if v == 16, the uninit value is not used (the use is properly guarded). */
unsigned int undef; /* { dg-bogus "may be used uninitialized" } */
unsigned int _2;
unsigned int _9;
unsigned int _10;
unsigned pred;
__BB(2):
if (v_4(D) != 16u)
goto __BB3;
else
goto __BB4;
/* 'undef' is defined conditionally (under 'v != 16' predicate) */
__BB(3):
undef_8 = 8u;
goto __BB4;
/* An undef value flows into a phi. */
__BB(4):
undef_1 = __PHI (__BB2: undef_5(D), __BB3: undef_8);
pred = v_4(D) & 3u;
if (pred != 0u)
goto __BB5;
else
goto __BB6;
/* The phi value is used here (under 'v & 3' predicate). */
__BB(5):
_9 = undef_1;
goto __BB7;
__BB(6):
_10 = v_4(D);
goto __BB7;
__BB(7):
_2 = __PHI (__BB5: _9, __BB6: _10);
return _2;
}
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