Bug ID: JDK-8215044 C2 crash in loopTransform.cpp with assert(cl->trip_count()

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JDK 11	JDK 12	JDK 13
11.0.5Fixed	12 b27Fixed	13Fixed

Attached Test.java
-----------------
public class Test {
    public static void main(String[] args) {
        Test issue = new Test();
        for (int i = 0; i < 10000; i++) {
            issue.test(new int[999]);
        }
    }
    public void test (int[] iaarg) {
        int[] iarr = new int[777];
        for (int i = 4; i > 0; i--) {
            for (int j = 0; j <= i - 1; j++) {
                int istep = 2 * j - i + 1;
                int iadj = 0;
                if (istep < 0) {
                    iadj = iarr[0-istep] + iaarg[i-1];
                } else {
                    iadj = iarr[istep] + iaarg[i-1];
                }
            }
        }
    }
}
-----------------

$ javac Test.java
$ java -XX:CompileOnly=Test.test Test
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/home/rvraghav/data/build/jdk-jdk/open/src/hotspot/share/opto/loopTransform.cpp:567), pid=5452, tid=5464
#  assert(cl->trip_count() > 0) failed: peeling a fully unrolled loop
#
# JRE version: Java(TM) SE Runtime Environment (12.0) (slowdebug build 12-internal+0-2018-12-07-1555497.rvraghav.null)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (slowdebug 12-internal+0-2018-12-07-1555497.rvraghav.null, mixed mode, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V  [libjvm.so+0xe1561c]  PhaseIdealLoop::do_peeling(IdealLoopTree*, Node_List&)+0xce
#
<attached hs_err_pid5452.log>

Found this case when working for JDK-8211698.
(not sure if same root cause / duplicate of JDK-8211698)
Also can be related to JDK-8193130.

Failures present with current latest JDK 12 sources build.
(unlike 8211698 case, here reverting just 8193130 fix is NOT solving the failure)


Found minor changes in above test case can cause different type failures for different versions -
.e.g. failures: 
 - (Original issue handled by JDK-8193130) - assert(false) failed: Bad graph detected in build_loop_late 
 - SIGILL failure (as in JDK-8211698)
(some failures reproducible even with JDK10b46)

Fix-request: Needs backport b/c crash. Change from jdk12 applies cleanly in jdk-updates/jdku-dev. Tier1 tests passing w/o regressions.
05-08-2019
New regression test passes in mach5
12-02-2019
I think this is a duplicate of JDK-8211698 (or at least strongly related). I think we can close it as duplicate and make sure that the fix for JDK-8211698 includes both versions of the regression test. EDIT: Seems like it's still reproducible with my fix for JDK-8211698 so probably not a duplicate.
12-12-2018
Hi [~roland], Based on the comments in JDK-8211698, assigning this task also to you. Thank you.
10-12-2018
ILW = c2 crash; seems rare; disable compilation of identified method = HMM = P2
08-12-2018

Relates :	JDK-8193130 - Bad graph when unrolled loop bounds conflicts with range checks
Relates :	JDK-8216135 - C2 assert(!had_error) failed: bad dominance
Relates :	JDK-8211698 - Crash in C2 compiled code during execution of double array heavy processing code