https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87469
Bug ID: 87469
Summary: ice in record_estimate, at tree-ssa-loop-niter.c:3271
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
For this C++ source code:
long a;
struct c {
void d(unsigned f) {
long e = f;
while (e & e - 1)
e &= e - 1;
a = e;
}
};
void g() {
c b;
b.d(4 + 2);
}
compiled by recent gcc trunk and compiler flag -O2, does this:
$ ~/gcc/results/bin/gcc -c -w -O2 bug466.cc
during GIMPLE pass: cunrolli
bug466.cc: In function ‘void g()’:
bug466.cc:10:6: internal compiler error: in record_estimate, at
tree-ssa-loop-niter.c:3271
10 | void g() {
| ^
0x10bc8da record_estimate
../../trunk/gcc/tree-ssa-loop-niter.c:3271
0x10c391b estimate_numbers_of_iterations(loop*)
../../trunk/gcc/tree-ssa-loop-niter.c:4122
0x10c4c0c estimate_numbers_of_iterations(function*)
../../trunk/gcc/tree-ssa-loop-niter.c:4342
0x109e88e tree_unroll_loops_completely
../../trunk/gcc/tree-ssa-loop-ivcanon.c:1424
The problem seems to first occur somewhere between revisions
261000 and 262000.
