symm/rijndael-x86-aesni.S: Use xmm5 instead of xmm7.

The only reason is that (stupidly) the Windows 64-bit ABI designates
(the bottom 128 bits of) xmm7 as being callee-saved.

diff --git a/symm/rijndael-x86-aesni.S b/symm/rijndael-x86-aesni.S
index eba7b05..13c1ad5 100644 (file)
--- a/symm/rijndael-x86-aesni.S
+++ b/symm/rijndael-x86-aesni.S
@@ -267,7 +267,7 @@ FUNC(rijndael_setup_x86_aesni)
 
        // Find the byte-reordering table.
        ldgot   ecx
-       movdqa  xmm7, [INTADDR(endswap_tab, ecx)]
+       movdqa  xmm5, [INTADDR(endswap_tab, ecx)]
 
        // Calculate the number of subkey words again.  (It's a good job
        // we've got a fast multiplier.)
@@ -295,9 +295,9 @@ FUNC(rijndael_setup_x86_aesni)
        .align  16
 endswap_block:
        // End-swap ECX words starting at ESI.  The end-swapping table is
-       // already loaded into XMM7; and it's OK to work in 16-byte chunks.
+       // already loaded into XMM5; and it's OK to work in 16-byte chunks.
        movdqu  xmm1, [esi]
-       pshufb  xmm1, xmm7
+       pshufb  xmm1, xmm5
        movdqu  [esi], xmm1
        add     esi, 16
        sub     ecx, 4
@@ -318,13 +318,13 @@ FUNC(rijndael_eblk_x86_aesni)
 
        // Find the magic endianness-swapping table.
        ldgot   ecx
-       movdqa  xmm7, [INTADDR(endswap_tab, ecx)]
+       movdqa  xmm5, [INTADDR(endswap_tab, ecx)]
 
        // Load the input block and end-swap it.  Also, start loading the
        // keys.
        mov     eax, [esp + 8]
        movdqu  xmm0, [eax]
-       pshufb  xmm0, xmm7
+       pshufb  xmm0, xmm5
        mov     eax, [esp + 4]
        lea     edx, [eax + w]
        mov     eax, [eax + nr]
@@ -409,7 +409,7 @@ er10:       movdqu  xmm1, [edx]
        aesenclast xmm0, xmm1
 
        // Unpermute the ciphertext block and store it.
-       pshufb  xmm0, xmm7
+       pshufb  xmm0, xmm5
        mov     eax, [esp + 12]
        movdqu  [eax], xmm0
 
@@ -427,13 +427,13 @@ FUNC(rijndael_dblk_x86_aesni)
 
        // Find the magic endianness-swapping table.
        ldgot   ecx
-       movdqa  xmm7, [INTADDR(endswap_tab, ecx)]
+       movdqa  xmm5, [INTADDR(endswap_tab, ecx)]
 
        // Load the input block and end-swap it.  Also, start loading the
        // keys.
        mov     eax, [esp + 8]
        movdqu  xmm0, [eax]
-       pshufb  xmm0, xmm7
+       pshufb  xmm0, xmm5
        mov     eax, [esp + 4]
        lea     edx, [eax + wi]
        mov     eax, [eax + nr]
@@ -518,7 +518,7 @@ dr10:       movdqu  xmm1, [edx]
        aesdeclast xmm0, xmm1
 
        // Unpermute the ciphertext block and store it.
-       pshufb  xmm0, xmm7
+       pshufb  xmm0, xmm5
        mov     eax, [esp + 12]
        movdqu  [eax], xmm0