http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57372
Bug ID: 57372
Summary: [4.9 Regression] Miscompiled tailcall on ARM
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zhroma at ispras dot ru
Created attachment 30164
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30164&action=edit
Preprocessed minimized testcase
On ARM, gcc 4.9 revision 198928 and later sometimes creates wrong code for
tailcall.
For C++ code:
class A {
public:
virtual void foo1();
};
A& foo2() {}
void foo3() {
foo2().foo1();
}
In function foo3 last instruction is "bx r3", but register r3 doesn't contain a
proper address at that moment. Attachment contains practically the same code,
it was adjusted to create an executable, and executable produced by "g++ -O2"
segfaults.
Earlier versions of GCC works ok.
