8288781: C1: LIR_OpVisitState::maxNumberOfOperands too small

Backport-of: 3f5e48a44ee77d07dea3d2c4ae52aaf19b8dc7cb

src/hotspot/share/c1/c1_LIR.hpp

@@ -2315,7 +2315,7 @@ class LIR_OpVisitState: public StackObj {
   typedef enum { inputMode, firstMode = inputMode, tempMode, outputMode, numModes, invalidMode = -1 } OprMode;
 
   enum {
-    maxNumberOfOperands = 20,
+    maxNumberOfOperands = 21,
     maxNumberOfInfos = 4
   };
 

test/hotspot/jtreg/compiler/c1/TestManyMethodParameters.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2022 SAP SE. 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.
+ *
+ */
+
+/**
+ * @test
+ * @bug 8288781
+ * @summary Test if a call with 8 integer + 13 float = 21 parameters can can be compiled.
+ *          On ppc all parameters can be passed in registers.
+ * @author Richard Reingruber
+ *
+ * @run main/othervm -Xbatch -XX:CompileCommand=dontinline,*::*dontinline* compiler.c1.TestManyMethodParameters
+ */
+
+package compiler.c1;
+
+public class TestManyMethodParameters {
+    public static void main(String[] args) {
+        for (int i = 30_000; i >= 0; i--) {
+            double sum = testMethod_01_dontinline();
+            if (sum != 127) {
+                throw new Error("Wrong sum: " + sum);
+            }
+        }
+    }
+
+    public static double testMethod_01_dontinline() {
+        return testMethod_01_manyArgs(1, 2, 3, 4, 5, 6, 7, 8,
+                                      1.0d, 2.0d, 3.0d, 4.0d, 5.0d, 6.0d, 7.0d, 8.0d, 9.0d, 10.0d, 11.0d, 12.0d, 13.0d);
+    }
+
+    public static double testMethod_01_manyArgs(long l1, long l2, long l3, long l4, long l5, long l6, long l7, long l8,
+                                                double d1, double d2, double d3, double d4, double d5, double d6, double d7,
+                                                double d8, double d9, double d10, double d11, double d12, double d13) {
+        return l1+l2+l3+l4+l5+l6+l7+l8+d1+d2+d3+d4+d5+d6+d7+d8+d9+d10+d11+d12+d13;
+    }
+}