(x86 asm): Zero the high parts of the ?MM registers if available.

[catacomb] / symm / rijndael-x86ish-aesni.S

diff --git a/symm/rijndael-x86ish-aesni.S b/symm/rijndael-x86ish-aesni.S
index e556aa5..a7a1ece 100644 (file)
--- a/symm/rijndael-x86ish-aesni.S
+++ b/symm/rijndael-x86ish-aesni.S
@@ -61,6 +61,12 @@
 ///--------------------------------------------------------------------------
 /// Key setup.
 
+FUNC(rijndael_setup_x86ish_aesni_avx)
+       vzeroupper                    // avoid penalty on `legacy' XMM access
+  endprologue
+       // and drop through...
+ENDFUNC
+
 FUNC(rijndael_setup_x86ish_aesni)
 
 #define SI WHOLE(si)
@@ -365,6 +371,12 @@ ENDFUNC
 /// Encrypting and decrypting blocks.
 
 .macro encdec  op, aes, koff
+  FUNC(rijndael_\op\()_x86ish_aesni_avx)
+       vzeroupper                      // avoid XMM penalties
+  endprologue
+       // and drop through...
+  ENDFUNC
+
   FUNC(rijndael_\op\()_x86ish_aesni)
 
 #if CPUFAM_X86