Merge branch 'risc-v' into develop

Author: sergei-lewis

Makefile.prebuild

@@ -57,6 +57,21 @@ endif
 
 ifeq ($(TARGET), CK860FV)
 TARGET_FLAGS = -march=ck860v -mcpu=ck860fv -mfdivdu -mhard-float
+
+ifeq ($(TARGET), x280)
+TARGET_FLAGS = -march=rv64imafdcv_zba_zbb_zfh -mabi=lp64d
+endif
+
+ifeq ($(TARGET), RISCV64_ZVL256B)
+TARGET_FLAGS = -march=rv64imafdcv -mabi=lp64d
+endif
+
+ifeq ($(TARGET), RISCV64_ZVL128B)
+TARGET_FLAGS = -march=rv64imafdcv -mabi=lp64d
+endif
+
+ifeq ($(TARGET), RISCV64_GENERIC)
+TARGET_FLAGS = -march=rv64imafdc -mabi=lp64d
 endif
 
 all: getarch_2nd

Makefile.riscv64

@@ -2,3 +2,19 @@ ifeq ($(CORE), C910V)
 CCOMMON_OPT += -march=rv64imafdcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c920
 FCOMMON_OPT += -march=rv64imafdcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c920 -static
 endif
+ifeq ($(CORE), x280)
+CCOMMON_OPT += -march=rv64imafdcv_zba_zbb_zfh_zvl512b -mabi=lp64d -ffast-math
+FCOMMON_OPT += -march=rv64imafdcv_zba_zbb_zfh -mabi=lp64d -static
+endif
+ifeq ($(CORE), RISCV64_ZVL256B)
+CCOMMON_OPT += -march=rv64imafdcv_zvl256b -mabi=lp64d
+FCOMMON_OPT += -march=rv64imafdcv -mabi=lp64d -static
+endif
+ifeq ($(CORE), RISCV64_ZVL128B)
+CCOMMON_OPT += -march=rv64imafdcv -mabi=lp64d 
+FCOMMON_OPT += -march=rv64imafdcv -mabi=lp64d -static
+endif
+ifeq ($(CORE), RISCV64_GENERIC)
+CCOMMON_OPT += -march=rv64imafdc -mabi=lp64d
+FCOMMON_OPT += -march=rv64imafdc -mabi=lp64d -static
+endif

README.md

@@ -198,6 +198,11 @@ Please read `GotoBLAS_01Readme.txt` for older CPU models already supported by th
   ```
   (also known to work on C906 as long as you use only single-precision functions - its instruction set support appears to be incomplete in double precision)
 
+- **x280**: Level-3 BLAS and Level-1,2 are optimized by RISC-V Vector extension 1.0.
+  ```sh
+  make HOSTCC=gcc TARGET=x280 NUM_THREADS=8 CC=riscv64-unknown-linux-gnu-clang FC=riscv64-unknown-linux-gnu-gfortran
+  ```
+
 ### Support for multiple targets in a single library
 
 OpenBLAS can be built for multiple targets with runtime detection of the target cpu by specifiying `DYNAMIC_ARCH=1` in Makefile.rule, on the gmake command line or as `-DDYNAMIC_ARCH=TRUE` in cmake.

TargetList.txt

@@ -118,8 +118,11 @@ Z13
 Z14
 
 10.RISC-V 64:
-RISCV64_GENERIC
+RISCV64_GENERIC (e.g. PolarFire Soc/SiFive U54)
+RISCV64_ZVL128B
 C910V
+x280
+RISCV64_ZVL256B
 
 11.LOONGARCH64:
 LOONGSONGENERIC