From cbd77fc9f3e6c8f1e996b30afe208c6a074cce3a Mon Sep 17 00:00:00 2001
From: Martin Doerr <mdoerr@openjdk.org>
Date: Tue, 11 Nov 2025 14:26:58 +0000
Subject: [PATCH] 8370244: [PPC64] Several vector tests fail on Power8

Reviewed-by: dbriemann, rrich
---
 src/hotspot/cpu/ppc/vm_version_ppc.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/hotspot/cpu/ppc/vm_version_ppc.cpp b/src/hotspot/cpu/ppc/vm_version_ppc.cpp
index 8b1de754650..75feb389298 100644
--- a/src/hotspot/cpu/ppc/vm_version_ppc.cpp
+++ b/src/hotspot/cpu/ppc/vm_version_ppc.cpp
@@ -111,6 +111,10 @@ void VM_Version::initialize() {
   }
 
   MaxVectorSize = SuperwordUseVSX ? 16 : 8;
+  if (!SuperwordUseVSX && FLAG_IS_DEFAULT(EnableVectorSupport)) {
+    // VectorSupport intrinsics currently have issues with MaxVectorSize < 16 (JDK-8370803).
+    FLAG_SET_ERGO(EnableVectorSupport, false);
+  }
   if (FLAG_IS_DEFAULT(AlignVector)) {
     FLAG_SET_ERGO(AlignVector, false);
   }