8202710: AARCH64: sporadic jtreg test fail

Reviewed-by: aph, dsamersoff

src/hotspot/cpu/aarch64/aarch64.ad

@@ -3665,7 +3665,7 @@ const bool Matcher::strict_fp_requires_explicit_rounding = false;
 
 // Are floats converted to double when stored to stack during
 // deoptimization?
-bool Matcher::float_in_double() { return true; }
+bool Matcher::float_in_double() { return false; }
 
 // Do ints take an entire long register or just half?
 // The relevant question is how the int is callee-saved:

src/hotspot/cpu/aarch64/sharedRuntime_aarch64.cpp

@@ -2937,7 +2937,7 @@ SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_t
 
   // Exception pending
 
-  RegisterSaver::restore_live_registers(masm);
+  RegisterSaver::restore_live_registers(masm, save_vectors);
 
   __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
 

test/hotspot/jtreg/compiler/runtime/TestFloatsOnStackDeopt.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package compiler.runtime;
+
+/*
+ * @test
+ * @summary testing deoptimization on safepoint with floating point values on stack
+ * @bug 8202710
+ * @run main/othervm -XX:+DeoptimizeALot
+ *                   -XX:+UnlockDiagnosticVMOptions -XX:+IgnoreUnrecognizedVMOptions
+ *                   compiler.runtime.TestFloatsOnStackDeopt
+ */
+
+public class TestFloatsOnStackDeopt {
+
+    private static final int ARRLEN = 97;
+    private static final int ITERS1 = 100;
+    private static final int ITERS2 = 40000;
+    private static final float VALUE = 15.f;
+    public static String dummyString = "long long string";
+
+    static void run_loop_with_safepoint(float[] a0, float b) {
+        // Non-counted loop with safepoint.
+        for (long l = 0; l < ITERS2; l++) {
+            // Counted and vectorized loop.
+            for (int i = 0; i < a0.length; i += 1) {
+                a0[i] += b;
+            }
+        }
+    }
+
+    static int test() {
+        // thread provokes frequent GC - together with +DeoptimizeALot and safepoint it forces executed function deoptimization
+        Thread th = new Thread() {
+            public void run() {
+                while(true) {
+                    synchronized(this) { try { wait(1); } catch (Exception ex) {} }
+                    dummyString += dummyString;
+                    if (dummyString.length() > 1024*1024) { dummyString = "long long string"; }
+                }
+            }
+        };
+        th.start();
+
+        int errn = 0;
+        for (int j = 0; j < ITERS1; j++) {
+            float[] x0 = new float[ARRLEN];
+            run_loop_with_safepoint(x0, VALUE);
+            for (int i = 0; i < ARRLEN; i++) {
+                if (x0[i] != VALUE * ITERS2) {
+                    System.err.println("(" + j + "): " + "x0[" + i + "] = " + x0[i] + " != " + VALUE * ITERS2);
+                    errn++;
+                }
+                x0[i] = 0.f; // Reset
+            }
+            if (errn > 0) break;
+        }
+
+        th.stop();
+        return errn;
+    }
+
+    public static void main(String args[]) {
+        int errn = test();
+        System.err.println((errn > 0) ? "FAILED" : "PASSED");
+    }
+}
+