Add RISC-V 64-bit support

adds a riscv64 target architecture to the Makefile to support RISC-V 64-bit.
Compiled and tested on VisionFive 2 board.

closes https://github.com/official-stockfish/Stockfish/pull/4205

No functional change.

diff --git a/AUTHORS b/AUTHORS
index 89e7c9edcb925807f87aebf28ab2627614c06756..d4b37e7abb2b1ff614924ecb9e7e95b641f4e00d 100644 (file)
--- a/AUTHORS
+++ b/AUTHORS
@@ -43,6 +43,7 @@ Bryan Cross (crossbr)
 candirufish
 Chess13234
 Chris Cain (ceebo)
+clefrks
 Dale Weiler (graphitemaster)
 Dan Schmidt (dfannius)
 Daniel Axtens (daxtens)

diff --git a/src/Makefile b/src/Makefile
index 727466f9b57f3565d81b8bbde1c98118d0c62e4e..e481aca5141a54377b1b43185faee8b672d42ffb 100644 (file)
--- a/src/Makefile
+++ b/src/Makefile
@@ -116,7 +116,7 @@ ifeq ($(ARCH), $(filter $(ARCH), \
                  x86-64-vnni512 x86-64-vnni256 x86-64-avx512 x86-64-avxvnni x86-64-bmi2 \
                  x86-64-avx2 x86-64-sse41-popcnt x86-64-modern x86-64-ssse3 x86-64-sse3-popcnt \
                  x86-64 x86-32-sse41-popcnt x86-32-sse2 x86-32 ppc-64 ppc-32 e2k \
-                 armv7 armv7-neon armv8 apple-silicon general-64 general-32))
+                 armv7 armv7-neon armv8 apple-silicon general-64 general-32 riscv64))
    SUPPORTED_ARCH=true
 else
    SUPPORTED_ARCH=false
@@ -338,7 +338,11 @@ ifeq ($(findstring e2k,$(ARCH)),e2k)
        popcnt = yes
 endif
 
+ifeq ($(ARCH),riscv64)
+       arch = riscv64
 endif
+endif
+
 
 ### ==========================================================================
 ### Section 3. Low-level Configuration
@@ -364,11 +368,14 @@ ifeq ($(COMP),gcc)
        CXX=g++
        CXXFLAGS += -pedantic -Wextra -Wshadow
 
-       ifeq ($(arch),$(filter $(arch),armv7 armv8))
+       ifeq ($(arch),$(filter $(arch),armv7 armv8 riscv64))
                ifeq ($(OS),Android)
                        CXXFLAGS += -m$(bits)
                        LDFLAGS += -m$(bits)
                endif
+               ifeq ($(ARCH),riscv64)
+                       CXXFLAGS += -latomic
+               endif
        else
                CXXFLAGS += -m$(bits)
                LDFLAGS += -m$(bits)
@@ -429,11 +436,14 @@ ifeq ($(COMP),clang)
        endif
        endif
 
-       ifeq ($(arch),$(filter $(arch),armv7 armv8))
+       ifeq ($(arch),$(filter $(arch),armv7 armv8 riscv64))
                ifeq ($(OS),Android)
                        CXXFLAGS += -m$(bits)
                        LDFLAGS += -m$(bits)
                endif
+               ifeq ($(ARCH),riscv64)
+                       CXXFLAGS += -latomic
+               endif
        else
                CXXFLAGS += -m$(bits)
                LDFLAGS += -m$(bits)
@@ -757,6 +767,7 @@ help:
        @echo "apple-silicon           > Apple silicon ARM64"
        @echo "general-64              > unspecified 64-bit"
        @echo "general-32              > unspecified 32-bit"
+       @echo "riscv64                 > RISC-V 64-bit"
        @echo ""
        @echo "Supported compilers:"
        @echo ""
@@ -916,7 +927,7 @@ config-sanity: net
        @test "$(SUPPORTED_ARCH)" = "true"
        @test "$(arch)" = "any" || test "$(arch)" = "x86_64" || test "$(arch)" = "i386" || \
         test "$(arch)" = "ppc64" || test "$(arch)" = "ppc" || test "$(arch)" = "e2k" || \
-        test "$(arch)" = "armv7" || test "$(arch)" = "armv8" || test "$(arch)" = "arm64"
+        test "$(arch)" = "armv7" || test "$(arch)" = "armv8" || test "$(arch)" = "arm64" || test "$(arch)" = "riscv64"
        @test "$(bits)" = "32" || test "$(bits)" = "64"
        @test "$(prefetch)" = "yes" || test "$(prefetch)" = "no"
        @test "$(popcnt)" = "yes" || test "$(popcnt)" = "no"