From: Andy Polyakov <appro@openssl.org>
Date: Sun, 31 Dec 2017 12:23:08 +0000 (+0100)
Subject: ec/curve25519.c: avoid 2^51 radix on SPARC.
X-Git-Tag: OpenSSL_1_1_1-pre1~225
X-Git-Url: https://git.openssl.org/?p=openssl.git;a=commitdiff_plain;h=26b05245f0d3a6cea970f104f6aff388948fe318

ec/curve25519.c: avoid 2^51 radix on SPARC.

SPARC ISA doesn't have provisions to back up 128-bit multiplications
and additions. And so multiplications are done with library calls
and carries with comparisons and conditional moves. As result base
2^51 code is >40% slower...

Reviewed-by: Tim Hudson <tjh@openssl.org>
---

diff --git a/crypto/ec/curve25519.c b/crypto/ec/curve25519.c
index d1c725fa39..f32fc04d6a 100644
--- a/crypto/ec/curve25519.c
+++ b/crypto/ec/curve25519.c
@@ -12,6 +12,7 @@
 #include <openssl/sha.h>
 
 #if !defined(PEDANTIC) && \
+    !defined(__sparc__) && \
     (defined(__SIZEOF_INT128__) && __SIZEOF_INT128__==16)
 /*
  * Base 2^51 implementation.