[Bug tree-optimization/32100] New: [4.2/4.3 Regression] vrp bitfield miscompilation
belyshev at depni dot sinp dot msu dot ru
gcc-bugzilla@gcc.gnu.org
Sat May 26 21:30:00 GMT 2007
// Kudos to Yuriy Tsibizov for doing all dirty work hunting down miscompilation
// of snd_emu10k1 driver in FreeBSD -CURRENT
// small testcase, compile with -O1 -ftree-vrp
void abort (void);
struct T
{
int b : 1;
} t;
void __attribute__((noinline)) foo (int f)
{
t.b = (f & 0x10) ? 1 : 0;
}
int main (void)
{
foo (0x10);
if (!t.b)
abort ();
return 0;
}
--
Summary: [4.2/4.3 Regression] vrp bitfield miscompilation
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: belyshev at depni dot sinp dot msu dot ru
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32100
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