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diff src/cpu/x86/vm/stubGenerator_x86_64.cpp @ 8873:e961c11b85fe

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8011102: Clear AVX registers after return from JNI call Summary: Execute vzeroupper instruction after JNI call and on exits in jit compiled code which use 256bit vectors. Reviewed-by: roland
author kvn
date Wed, 03 Apr 2013 11:12:57 -0700
parents e2e6bf86682c
children b9a918201d47 3f281b313240
line wrap: on
line diff
--- a/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Tue Apr 02 09:30:07 2013 +0200
+++ b/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Wed Apr 03 11:12:57 2013 -0700
@@ -1331,6 +1331,10 @@
       }
       __ addptr(qword_count, 4);
       __ BIND(L_end);
+      if (UseAVX >= 2) {
+        // clean upper bits of YMM registers
+        __ vzeroupper();
+      }
     } else {
       // Copy 32-bytes per iteration
       __ BIND(L_loop);
@@ -1404,6 +1408,10 @@
       }
       __ subptr(qword_count, 4);
       __ BIND(L_end);
+      if (UseAVX >= 2) {
+        // clean upper bits of YMM registers
+        __ vzeroupper();
+      }
     } else {
       // Copy 32-bytes per iteration
       __ BIND(L_loop);