Compiling the following code snippet with
"-ftree-vectorize -O2 -march=pentium4" triggers an ICE on mainline
(the 4.0 branch is not affected):
============================================
struct A
{
double d[2];
double foo(int i) { return d[i]; }
};
struct B : public A {};
void bar(B& b)
{
for (int i=0; i<2; ++i)
b.d[i] = b.foo(i);
}
============================================
bug.cc: In function 'void bar(B&)':
bug.cc:9: error: Definition in block 1 does not dominate use in block 18
for SSA_NAME: this_5 in statement:
vect_p.20_56 = this_5 + base_off.19_55;
lall.cc:9: internal compiler error: verify_ssa failed.
Please submit a full bug report, [etc.]
--
Summary: [4.1 regression] ICE using -ftree-vectorize
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code, monitored
Severity: normal
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: reichelt at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21218
