8337791: VectorAPI jtreg ABSMaskedByteMaxVectorTests crashes with UseAVX=0 -XX:MaxVectorSize=8

src/hotspot/cpu/x86/x86.ad

@@ -3320,6 +3320,11 @@ bool Matcher::match_rule_supported_vector(int opcode, int vlen, BasicType bt) {
         return false;
       }
       break;
+    case Op_VectorBlend:
+      if (UseAVX == 0 && size_in_bits < 128) {
+        return false;
+      }
+      break;
     case Op_VectorTest:
       if (UseSSE < 4) {
         return false; // Implementation limitation

test/hotspot/jtreg/compiler/vectorapi/TestABSMaskedMaxByteVector.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2025, 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.vectorapi;
+
+import compiler.lib.ir_framework.*;
+import jdk.incubator.vector.*;
+
+/*
+ * @test
+ * @bug 8337791
+ * @summary Test byte vector predicated ABS with UseAVX=0 and MaxVectorSize=8
+ * @modules jdk.incubator.vector
+ * @library /test/lib /
+ * @run driver compiler.vectorapi.TestABSMaskedMaxByteVector
+ */
+
+public class TestABSMaskedMaxByteVector {
+    public static final VectorSpecies<Byte> BSP = ByteVector.SPECIES_MAX;
+    public static int idx = 0;
+
+    public static void main(String[] args) {
+        TestFramework.runWithFlags("--add-modules=jdk.incubator.vector", "-ea", "-XX:+IgnoreUnrecognizedVMOptions", "-XX:UseAVX=0", "-XX:MaxVectorSize=8");
+        TestFramework.runWithFlags("--add-modules=jdk.incubator.vector", "-ea");
+    }
+
+    @Test
+    @IR(failOn = {IRNode.ABS_VB}, applyIfAnd={"MaxVectorSize", " <= 8 ", "UseAVX", "0"}, applyIfPlatform={"x64", "true"}, applyIfCPUFeature={"sse4.1", "true"})
+    @IR(counts = {IRNode.ABS_VB, "1"}, applyIf={"MaxVectorSize", " > 8 "}, applyIfPlatform={"x64", "true"}, applyIfCPUFeature={"sse4.1", "true"})
+    public void test() {
+        assert ByteVector.broadcast(BSP, (byte)-4)
+                         .lanewise(VectorOperators.ABS, VectorMask.fromLong(BSP, 0xF))
+                         .lane(idx++ & 3) == 4;
+    }
+}