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| author | Jussi Kivilinna <jussi.kivilinna@iki.fi> | 2015-04-22 20:29:05 +0300 |
|---|---|---|
| committer | Jussi Kivilinna <jussi.kivilinna@iki.fi> | 2015-04-26 13:43:24 +0300 |
| commit | f88266c0f868d7bf51a215d5531bb9f2b4dad19e (patch) | |
| tree | 42e916141425016d6887a6992e09d18269f35aa4 /cipher/cipher-gcm-intel-pclmul.c | |
| parent | 305cc878d395475c46b4ef52f4764bd0c85bf8ac (diff) | |
| download | libgcrypt-f88266c0f868d7bf51a215d5531bb9f2b4dad19e.tar.gz | |
Disallow compiler from generating SSE instructions in mixed C+asm source
* cipher/cipher-gcm-intel-pclmul.c [gcc-version >= 4.4]: Add GCC target
pragma to disable compiler use of SSE.
* cipher/rijndael-aesni.c [gcc-version >= 4.4]: Ditto.
* cipher/rijndael-ssse3-amd64.c [gcc-version >= 4.4]: Ditto.
--
These implementations assume that compiler does not use XMM registers
between assembly blocks.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Diffstat (limited to 'cipher/cipher-gcm-intel-pclmul.c')
| -rw-r--r-- | cipher/cipher-gcm-intel-pclmul.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/cipher/cipher-gcm-intel-pclmul.c b/cipher/cipher-gcm-intel-pclmul.c index 03144583..79648ce9 100644 --- a/cipher/cipher-gcm-intel-pclmul.c +++ b/cipher/cipher-gcm-intel-pclmul.c @@ -32,6 +32,13 @@ #ifdef GCM_USE_INTEL_PCLMUL + +#if _GCRY_GCC_VERSION >= 40400 /* 4.4 */ +/* Prevent compiler from issuing SSE instructions between asm blocks. */ +# pragma GCC target("no-sse") +#endif + + /* Intel PCLMUL ghash based on white paper: "Intel® Carry-Less Multiplication Instruction and its Usage for Computing the |