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diff src/cpu/x86/vm/stubGenerator_x86_32.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
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line diff
--- a/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Tue Apr 02 09:30:07 2013 +0200
+++ b/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Wed Apr 03 11:12:57 2013 -0700
@@ -835,6 +835,11 @@
   __ BIND(L_copy_64_bytes);
     __ subl(qword_count, 8);
     __ jcc(Assembler::greaterEqual, L_copy_64_bytes_loop);
+
+    if (UseUnalignedLoadStores && (UseAVX >= 2)) {
+      // clean upper bits of YMM registers
+      __ vzeroupper();
+    }
     __ addl(qword_count, 8);
     __ jccb(Assembler::zero, L_exit);
     //