Disable CRC32-VX Extention for some Clang versions

We have to disable the CRC32-VX implementation for some Clang versions
(18 <= version < 19.1.2) that generate bad code for the IBM S390 VGFMA intrinsics.

diff --git a/arch/s390/s390_functions.h b/arch/s390/s390_functions.h
index e9c67978f0a0372199058f901b5cfb3facdcf29d..e6855cd7011cf48068fcc51a9c7018bc7092e932 100644 (file)
--- a/arch/s390/s390_functions.h
+++ b/arch/s390/s390_functions.h
@@ -7,8 +7,15 @@
 
 #ifdef S390_CRC32_VX
 uint32_t crc32_s390_vx(uint32_t crc, const uint8_t *buf, size_t len);
+
+#ifdef __clang__
+#  if ((__clang_major__ == 18) || (__clang_major__ == 19 && (__clang_minor__ < 1 || (__clang_minor__ == 1 && __clang_patchlevel__ < 2))))
+# error CRC32-VX optimizations are broken due to compiler bug in Clang versions: 18.0.0 <= clang_version < 19.1.2. \
+        Either disable the zlib-ng CRC32-VX optimization, or switch to another compiler/compiler version.
+#  endif
 #endif
 
+#endif
 
 #ifdef DISABLE_RUNTIME_CPU_DETECTION
 #  if defined(S390_CRC32_VX) && defined(__zarch__) && __ARCH__ >= 11 && defined(__VX__)