From 10ec62d643a0c0174cd9ca74041bf13fa127d20e Mon Sep 17 00:00:00 2001
From: Harshit Dhiman <hdhiman@openjdk.org>
Date: Wed, 15 Jul 2026 04:17:27 +0000
Subject: [PATCH] 8388016: [s390x] Remove the alignment from stubGenerator

Reviewed-by: aph, amitkumar
---
 src/hotspot/cpu/s390/stubGenerator_s390.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/hotspot/cpu/s390/stubGenerator_s390.cpp b/src/hotspot/cpu/s390/stubGenerator_s390.cpp
index d1601d4f147..381d1c02277 100644
--- a/src/hotspot/cpu/s390/stubGenerator_s390.cpp
+++ b/src/hotspot/cpu/s390/stubGenerator_s390.cpp
@@ -3306,10 +3306,12 @@ class StubGenerator: public StubCodeGenerator {
     // Make room for the thawed frames and align the stack.
     __ add64(Z_RET, frame::z_abi_160_size);
 
-    { // stack alignment
-      __ z_lcgr(Z_RET, Z_RET); // negate Z_RET value
-      __ z_nill(Z_RET, -frame::alignment_in_bytes);
-    }
+#ifdef ASSERT
+    __ z_tmll(Z_RET, frame::alignment_in_bytes - 1);
+    __ asm_assert(Assembler::bcondAllZero, FILE_AND_LINE ": size is not aligned properly", 71);
+#endif // ASSERT
+
+    __ z_lcgr(Z_RET, Z_RET); // negate Z_RET value
     __ resize_frame( /* offset = */ Z_RET,/* fp = */ Z_R1, /* load_fp = */ true);
 
     __ z_lghi(Z_ARG2, kind);