[git] GCRYPT - branch, master, updated. libgcrypt-1.7.3-50-gaada604

[by Jussi Kivilinna]

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- Log -----------------------------------------------------------------
commit aada604594fd42224d366d3cb98f67fd3b989cd6
Author: Jussi Kivilinna <jussi.kivilinna at iki.fi>
Date:   Wed Jan 4 12:02:36 2017 +0200

    rijndael-ssse3: fix counter operand from read-only to read/write
    
    * cipher/rijndael-ssse3-amd64.c (_gcry_aes_ssse3_ctr_enc): Change
    'ctrlow' operand from read-only to read-write.
    --
    
    With read-only operand, compiler is allowed to pass temporary
    register to assembly block and throw away any calculation that
    have been done on that register. On the other hand, compiler is
    also allowed to keep operand value permanently in one register
    as value is treated as read-only, and effectly operates as
    expected. Selection between these two depends on compiler
    version and used flags.
    
    Signed-off-by: Jussi Kivilinna <jussi.kivilinna at iki.fi>

diff --git a/cipher/rijndael-ssse3-amd64.c b/cipher/rijndael-ssse3-amd64.c
index a8e89d4..2adb73f 100644
--- a/cipher/rijndael-ssse3-amd64.c
+++ b/cipher/rijndael-ssse3-amd64.c
@@ -387,8 +387,8 @@ _gcry_aes_ssse3_ctr_enc (RIJNDAEL_context *ctx, unsigned char *outbuf,
                     ".Lno_carry%=:\n\t"
 
                     "pshufb %%xmm6, %%xmm7\n\t"
-                    :
-                    : [ctr] "r" (ctr), [ctrlow] "r" (ctrlow)
+                    : [ctrlow] "+r" (ctrlow)
+                    : [ctr] "r" (ctr)
                     : "cc", "memory");
 
       do_vpaes_ssse3_enc (ctx, nrounds, aes_const_ptr);

-----------------------------------------------------------------------

Summary of changes:
 cipher/rijndael-ssse3-amd64.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)


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