Merge #10821: Add SSE4 optimized SHA256

6b8d872 Protect SSE4 code behind a compile-time flag (Pieter Wuille)
fa9be90 Add selftest for SHA256 transform (Pieter Wuille)
c1ccb15 Add SSE4 based SHA256 (Pieter Wuille)
2991c91 Add SHA256 dispatcher (Pieter Wuille)
4d50f38 Support multi-block SHA256 transforms (Pieter Wuille)

Pull request description:

  This adds an SSE4 assembly version of the SHA256 transform by Intel, and uses it at run time if SSE4 instructions are available, and use a fallback C++ implementation otherwise. Nearly every x86_64 CPU supports SSE4. The feature is only enabled when compiled with `--enable-experimental-asm`.

  In order to avoid build dependencies and other complications, the original Intel YASM code was translated to GCC extended asm syntax.

  This gives around a 50% speedup on the SHA256 benchmark for me.

  It is based on an earlier patch by @laanwj, though only includes a single assembly version (for now), and removes the YASM dependency.

Tree-SHA512: d31c50695ceb45264291537b93c0d7497670be38edf021ca5402eaa7d4e1e0e1ae492326e28d4e93979d066168129e62d1825e0384b1b906d36f85d93dfcb43c

1 files changed, 2 insertions, 0 deletions

diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
index 3ba81ed17b..0dd51a4908 100644
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -7,6 +7,7 @@
 #include "chainparams.h"
 #include "consensus/consensus.h"
 #include "consensus/validation.h"
+#include "crypto/sha256.h"
 #include "fs.h"
 #include "key.h"
 #include "validation.h"
@@ -33,6 +34,7 @@ extern void noui_connect();
 
 BasicTestingSetup::BasicTestingSetup(const std::string& chainName)
 {
+        SHA256AutoDetect();
         RandomInit();
         ECC_Start();
         SetupEnvironment();