Added support for BMI2 instructions

src/backend/cpu/interfaces/ICpuInfo.h

@@ -63,6 +63,7 @@ public:
     virtual Assembly::Id assembly() const                                           = 0;
     virtual bool hasAES() const                                                     = 0;
     virtual bool hasAVX2() const                                                    = 0;
+    virtual bool hasBMI2() const                                                    = 0;
     virtual bool hasOneGbPages() const                                              = 0;
     virtual const char *backend() const                                             = 0;
     virtual const char *brand() const                                               = 0;

src/backend/cpu/platform/AdvancedCpuInfo.cpp

@@ -156,6 +156,7 @@ xmrig::AdvancedCpuInfo::AdvancedCpuInfo() :
     }
 
     m_avx2 = data.flags[CPU_FEATURE_AVX2] && data.flags[CPU_FEATURE_OSXSAVE];
+    m_bmi2 = data.flags[CPU_FEATURE_BMI2];
 }
 
 

src/backend/cpu/platform/AdvancedCpuInfo.h

@@ -43,6 +43,7 @@ protected:
     inline Assembly::Id assembly() const override   { return m_assembly; }
     inline bool hasAES() const override             { return m_aes; }
     inline bool hasAVX2() const override            { return m_avx2; }
+    inline bool hasBMI2() const override            { return m_bmi2; }
     inline bool hasOneGbPages() const override      { return m_pdpe1gb; }
     inline const char *backend() const override     { return m_backend; }
     inline const char *brand() const override       { return m_brand; }
@@ -59,6 +60,7 @@ private:
     Assembly m_assembly;
     bool m_aes            = false;
     bool m_avx2           = false;
+    bool m_bmi2           = false;
     bool m_L2_exclusive   = false;
     char m_backend[32]{};
     char m_brand[64 + 5]{};

src/backend/cpu/platform/BasicCpuInfo.cpp

@@ -45,6 +45,10 @@
 #   define bit_AVX2 (1 << 5)
 #endif
 
+#ifndef bit_BMI2
+#   define bit_BMI2 (1 << 8)
+#endif
+
 #ifndef bit_PDPE1GB
 #   define bit_PDPE1GB (1 << 26)
 #endif
@@ -141,6 +145,12 @@ static inline bool has_avx2()
 }
 
 
+static inline bool has_bmi2()
+{
+    return has_feature(EXTENDED_FEATURES, EBX_Reg, bit_BMI2);
+}
+
+
 static inline bool has_pdpe1gb()
 {
     return has_feature(PROCESSOR_EXT_INFO, EDX_Reg, bit_PDPE1GB);
@@ -154,6 +164,7 @@ xmrig::BasicCpuInfo::BasicCpuInfo() :
     m_threads(std::thread::hardware_concurrency()),
     m_aes(has_aes_ni()),
     m_avx2(has_avx2()),
+    m_bmi2(has_bmi2()),
     m_pdpe1gb(has_pdpe1gb())
 {
     cpu_brand_string(m_brand);

src/backend/cpu/platform/BasicCpuInfo.h

@@ -44,6 +44,7 @@ protected:
     inline Assembly::Id assembly() const override   { return m_assembly; }
     inline bool hasAES() const override             { return m_aes; }
     inline bool hasAVX2() const override            { return m_avx2; }
+    inline bool hasBMI2() const override            { return m_bmi2; }
     inline bool hasOneGbPages() const override      { return m_pdpe1gb; }
     inline const char *brand() const override       { return m_brand; }
     inline MsrMod msrMod() const override           { return m_msrMod; }
@@ -63,6 +64,7 @@ private:
     Assembly m_assembly     = Assembly::NONE;
     bool m_aes              = false;
     const bool m_avx2       = false;
+    const bool m_bmi2       = false;
     const bool m_pdpe1gb    = false;
     MsrMod m_msrMod         = MSR_MOD_NONE;
     Vendor m_vendor         = VENDOR_UNKNOWN;

src/crypto/randomx/jit_compiler_x86.cpp

@@ -721,14 +721,31 @@ namespace randomx {
 		uint8_t* const p = code;
 		int pos = codePos;
 
+		const uint32_t dst = instr.dst;
+
 		emit(REX_MOV_RR64, p, pos);
-		emitByte(0xc0 + instr.dst, p, pos);
+		emitByte(0xc0 + dst, p, pos);
 		emit(REX_MUL_R, p, pos);
 		emitByte(0xe0 + instr.src, p, pos);
 		emit(REX_MOV_R64R, p, pos);
-		emitByte(0xc2 + 8 * instr.dst, p, pos);
+		emitByte(0xc2 + 8 * dst, p, pos);
 
-		registerUsage[instr.dst] = pos;
+		registerUsage[dst] = pos;
+		codePos = pos;
+	}
+
+	void JitCompilerX86::h_IMULH_R_BMI2(const Instruction& instr) {
+		uint8_t* const p = code;
+		int pos = codePos;
+
+		const uint32_t src = instr.src;
+		const uint32_t dst = instr.dst;
+
+		*(uint32_t*)(p + pos) = 0xC4D08B49 + (dst << 16);
+		*(uint32_t*)(p + pos + 4) = 0xC0F6FB42 + (dst << 27) + (src << 24);
+		pos += 8;
+
+		registerUsage[dst] = pos;
 		codePos = pos;
 	}
 
@@ -756,6 +773,29 @@ namespace randomx {
 		codePos = pos;
 	}
 
+	void JitCompilerX86::h_IMULH_M_BMI2(const Instruction& instr) {
+		uint8_t* const p = code;
+		int pos = codePos;
+
+		const uint64_t src = instr.src;
+		const uint64_t dst = instr.dst;
+
+		if (src != dst) {
+			genAddressReg<false>(instr, p, pos);
+			*(uint32_t*)(p + pos) = static_cast<uint32_t>(0xC4D08B49 + (dst << 16));
+			*(uint64_t*)(p + pos + 4) = 0x0E04F6FB62ULL + (dst << 27);
+			pos += 9;
+		}
+		else {
+			*(uint64_t*)(p + pos) = 0x86F6FB62C4D08B49ULL + (dst << 16) + (dst << 59);
+			*(uint32_t*)(p + pos + 8) = instr.getImm32() & ScratchpadL3Mask;
+			pos += 12;
+		}
+
+		registerUsage[dst] = pos;
+		codePos = pos;
+	}
+
 	void JitCompilerX86::h_ISMULH_R(const Instruction& instr) {
 		uint8_t* const p = code;
 		int pos = codePos;

src/crypto/randomx/jit_compiler_x86.hpp

@@ -123,7 +123,9 @@ namespace randomx {
 		void h_IMUL_R(const Instruction&);
 		void h_IMUL_M(const Instruction&);
 		void h_IMULH_R(const Instruction&);
+		void h_IMULH_R_BMI2(const Instruction&);
 		void h_IMULH_M(const Instruction&);
+		void h_IMULH_M_BMI2(const Instruction&);
 		void h_ISMULH_R(const Instruction&);
 		void h_ISMULH_M(const Instruction&);
 		void h_IMUL_RCP(const Instruction&);

src/crypto/randomx/randomx.cpp

@@ -41,6 +41,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "crypto/randomx/jit_compiler_a64_static.hpp"
 #endif
 
+#include "backend/cpu/Cpu.h"
+
 #include <cassert>
 
 RandomX_ConfigurationWownero::RandomX_ConfigurationWownero()
@@ -235,14 +237,29 @@ void RandomX_ConfigurationBase::Apply()
 	CEIL_##x = CEIL_##prev + RANDOMX_FREQ_##x; \
 	for (; k < CEIL_##x; ++k) { JIT_HANDLE(x, prev); }
 
+#define INST_HANDLE2(x, func_name, prev) \
+	CEIL_##x = CEIL_##prev + RANDOMX_FREQ_##x; \
+	for (; k < CEIL_##x; ++k) { JIT_HANDLE(func_name, prev); }
+
 	INST_HANDLE(IADD_RS, NULL);
 	INST_HANDLE(IADD_M, IADD_RS);
 	INST_HANDLE(ISUB_R, IADD_M);
 	INST_HANDLE(ISUB_M, ISUB_R);
 	INST_HANDLE(IMUL_R, ISUB_M);
 	INST_HANDLE(IMUL_M, IMUL_R);
-	INST_HANDLE(IMULH_R, IMUL_M);
+
-	INST_HANDLE(IMULH_M, IMULH_R);
+#if defined(_M_X64) || defined(__x86_64__)
+	if (xmrig::Cpu::info()->hasBMI2()) {
+		INST_HANDLE2(IMULH_R, IMULH_R_BMI2, IMUL_M);
+		INST_HANDLE2(IMULH_M, IMULH_M_BMI2, IMULH_R);
+	}
+	else
+#endif
+	{
+		INST_HANDLE(IMULH_R, IMUL_M);
+		INST_HANDLE(IMULH_M, IMULH_R);
+	}
+
 	INST_HANDLE(ISMULH_R, IMULH_M);
 	INST_HANDLE(ISMULH_M, ISMULH_R);
 	INST_HANDLE(IMUL_RCP, ISMULH_M);