From 6e1f5cfe4b50918db677f2646446c63c87f70547 Mon Sep 17 00:00:00 2001
From: Mounir IDRASSI <mounir.idrassi@idrix.fr>
Date: Sat, 2 Jan 2016 17:56:29 +0100
Subject: Windows: use compiler intrinsic for some functions used in
 cryptographic primitives to ensure maximum performance.

---
 src/Crypto/misc.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src')

diff --git a/src/Crypto/misc.h b/src/Crypto/misc.h
index 7b702ec2..78044491 100644
--- a/src/Crypto/misc.h
+++ b/src/Crypto/misc.h
@@ -33,8 +33,13 @@
 	#define CRYPTOPP_FAST_ROTATE(x) 0
 #endif
 
+#if defined( _MSC_VER ) && ( _MSC_VER > 800 )
+#pragma intrinsic(memcpy,memset)
+#endif
+
 #if _MSC_VER >= 1300 && !defined(__INTEL_COMPILER)
 // Intel C++ Compiler 10.0 calls a function instead of using the rotate instruction when using these instructions
+#pragma intrinsic(_rotr,_rotl,_rotr64,_rotl64)
 
 #define rotr32(x,n)	_rotr(x, n)
 #define rotl32(x,n)	_rotl(x, n)
@@ -62,8 +67,10 @@
 #else
 #define bswap_32(x)	(rotl32((((x) & 0xFF00FF00) >> 8) | (((x) & 0x00FF00FF) << 8), 16U))
 #endif
+#ifndef TC_NO_COMPILER_INT64
 #define bswap_64(x)	rotl64(((((((value & LL(0xFF00FF00FF00FF00)) >> 8) | ((value & LL(0x00FF00FF00FF00FF)) << 8)) & LL(0xFFFF0000FFFF0000)) >> 16) | (((((value & LL(0xFF00FF00FF00FF00)) >> 8) | ((value & LL(0x00FF00FF00FF00FF)) << 8)) & LL(0x0000FFFF0000FFFF)) << 16)), 32U)
 #endif
+#endif
 
 VC_INLINE uint32 ByteReverseWord32 (uint32 value)
 {
@@ -86,6 +93,8 @@ VC_INLINE uint32 ByteReverseWord32 (uint32 value)
 #endif
 }
 
+#ifndef TC_NO_COMPILER_INT64
+
 VC_INLINE uint64 ByteReverseWord64(uint64 value)
 {
 #if defined(__GNUC__) && defined(CRYPTOPP_X86_ASM_AVAILABLE) && defined(__x86_64__)
@@ -110,6 +119,7 @@ VC_INLINE void CorrectEndianess(uint64 *out, const uint64 *in, size_t byteCount)
 		out[i] = ByteReverseWord64(in[i]);
 }
 
+#endif
 
 #ifdef CRYPTOPP_ALLOW_UNALIGNED_DATA_ACCESS
 	#define GetAlignmentOf(T) 1
-- 
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