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From aada604594fd42224d366d3cb98f67fd3b989cd6 Mon Sep 17 00:00:00 2001
From: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Date: Wed, 4 Jan 2017 12:02:36 +0200
Subject: [PATCH 1/1] 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@iki.fi>
---
cipher/rijndael-ssse3-amd64.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
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);
--
2.8.0.rc3
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