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[Bug rtl-optimization/78617] LRA clobbers live register during rematerialization
- From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 30 Nov 2016 17:21:21 +0000
- Subject: [Bug rtl-optimization/78617] LRA clobbers live register during rematerialization
- Auto-submitted: auto-generated
- References: <bug-78617-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78617
ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2016-11-30
CC| |ktkachov at gcc dot gnu.org
Target Milestone|--- |5.5
Ever confirmed|0 |1
Known to fail| |5.4.1, 6.2.1
--- Comment #1 from ktkachov at gcc dot gnu.org ---
Confirmed on GCC 5 and 6.
The slightly modified testcase below aborts at -Os but not at -O0.
int a = 0;
int d = 1;
int f = 1;
int fn1() {
return a || 1 >> a;
}
int fn2(int p1, int p2) {
return p2 >= 2 ? p1 : p1 >> 1;
}
int fn3(int p1) {
return d ^ p1;
}
int fn4(int p1, int p2) {
return fn3(!d > fn2((f = fn1() - 1000) || p2, p1));
}
int main() {
if (fn4 (0, 0) != 1)
__builtin_abort ();
return 0;
}