From 14ad42447003550a985e7886606d165408c43c53 Mon Sep 17 00:00:00 2001
From: r-a-sattarov <51679282+r-a-sattarov@users.noreply.github.com>
Date: Sun, 26 Sep 2021 12:12:35 +0300
Subject: [PATCH] Add: use of Intel Intrinsics & RDTSC on e2k (MCST Elbrus
 2000) (#9575)

MCST e2k (Elbrus 2000) architecture has half native / half software support of most Intel/AMD SIMD
e.g. MMX/SSE/SSE2/SSE3/SSSE3/SSE4.1/SSE4.2/AES/AVX/AVX2 & 3DNow!/SSE4a/XOP/FMA4

E2K - this is VLIW/EPIC architecture, like Intel Itanium (IA-64) architecture.
Ref: https://en.wikipedia.org/wiki/Elbrus_2000

Co-authored-by: Alexander Troosh @troosh, Konstantin Ivlev @sse4 and Dmitry Shcherbakov @crypto-das
---
 src/cpu.cpp | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/src/cpu.cpp b/src/cpu.cpp
index b93f0fa5ed..d95c704e2a 100644
--- a/src/cpu.cpp
+++ b/src/cpu.cpp
@@ -73,6 +73,18 @@ uint64 ottd_rdtsc()
 # define RDTSC_AVAILABLE
 #endif
 
+/* rdtsc for MCST Elbrus 2000 */
+#if defined(__e2k__) && !defined(RDTSC_AVAILABLE)
+uint64 ottd_rdtsc()
+{
+	uint64_t dst;
+# pragma asm_inline
+	asm("rrd %%clkr, %0" : "=r" (dst));
+	return dst;
+}
+# define RDTSC_AVAILABLE
+#endif
+
 #if defined(__EMSCRIPTEN__) && !defined(RDTSC_AVAILABLE)
 /* On emscripten doing TIC/TOC would be ill-advised */
 uint64 ottd_rdtsc() {return 0;}
@@ -131,6 +143,24 @@ void ottd_cpuid(int info[4], int type)
 	);
 #endif /* i386 PIC */
 }
+#elif defined(__e2k__) /* MCST Elbrus 2000*/
+void ottd_cpuid(int info[4], int type)
+{
+	info[0] = info[1] = info[2] = info[3] = 0;
+	if (type == 0) {
+		info[0] = 1;
+	} else if (type == 1) {
+#if defined(__SSE4_1__)
+		info[2] |= (1<<19); /* HasCPUIDFlag(1, 2, 19) */
+#endif
+#if defined(__SSSE3__)
+		info[2] |= (1<<9); /* HasCPUIDFlag(1, 2, 9) */
+#endif
+#if defined(__SSE2__)
+		info[3] |= (1<<26); /* HasCPUIDFlag(1, 3, 26) */
+#endif
+	}
+}
 #else
 void ottd_cpuid(int info[4], int type)
 {