# HG changeset patch
# User aph
# Date 1562082892 -3600
# Node ID 599a7a7b6f773849c1f277e22407d2103fa545d9
# Parent  4077a625a01f9aa5e3744616e35324044db03e34
8226525: HotSpot compile-time error for x86-32
Reviewed-by: shade

diff -r 4077a625a01f -r 599a7a7b6f77 src/hotspot/os_cpu/linux_x86/orderAccess_linux_x86.hpp
--- a/src/hotspot/os_cpu/linux_x86/orderAccess_linux_x86.hpp	Mon Jul 01 08:24:45 2019 -0400
+++ b/src/hotspot/os_cpu/linux_x86/orderAccess_linux_x86.hpp	Tue Jul 02 16:54:52 2019 +0100
@@ -57,7 +57,13 @@
 
 inline void OrderAccess::cross_modify_fence() {
   int idx = 0;
+#ifdef AMD64
   __asm__ volatile ("cpuid " : "+a" (idx) : : "ebx", "ecx", "edx", "memory");
+#else
+  // On some x86 systems EBX is a reserved register that cannot be
+  // clobbered, so we must protect it around the CPUID.
+  __asm__ volatile ("xchg %%esi, %%ebx; cpuid; xchg %%esi, %%ebx " : "+a" (idx) : : "esi", "ecx", "edx", "memory");
+#endif
 }
 
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