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Author	SHA1	Message	Date
Mark Ryan	3b715e6162	Add autodetection for riscv64 Implement DYNAMIC_ARCH support for riscv64. Three cpu types are supported, riscv64_generic, riscv64_zvl256b, riscv64_zvl128b. The two non-generic kernels require CPU support for RVV 1.0 to function correctly. Detecting that a riscv64 device supports RVV 1.0 is a little complicated as there are some boards on the market that advertise support for V via hwcap but only support RVV 0.7.1, which is not binary compatible with RVV 1.0. The approach taken is to first try hwprobe. If hwprobe is not available, we fall back to hwcap + an additional check to distinguish between RVV 1.0 and RVV 0.7.1. Tested on a VM with VLEN=256, a CanMV K230 with VLEN=128 (with only the big core enabled), a Lichee Pi with RVV 0.7.1 and a VF2 with no vector. A compiler with RVV 1.0 support must be used to build OpenBLAS for riscv64 when DYNAMIC_ARCH=1. Signed-off-by: Mark Ryan <markdryan@rivosinc.com>	1 year ago

Author

SHA1

Message

Date

Mark Ryan

3b715e6162

Add autodetection for riscv64

Implement DYNAMIC_ARCH support for riscv64.  Three cpu types are
supported, riscv64_generic, riscv64_zvl256b, riscv64_zvl128b.
The two non-generic kernels require CPU support for RVV 1.0 to
function correctly.  Detecting that a riscv64 device supports
RVV 1.0 is a little complicated as there are some boards on the
market that advertise support for V via hwcap but only support
RVV 0.7.1, which is not binary compatible with RVV 1.0.  The
approach taken is to first try hwprobe.  If hwprobe is not
available, we fall back to hwcap + an additional check to distinguish
between RVV 1.0 and RVV 0.7.1.

Tested on a VM with VLEN=256, a CanMV K230 with VLEN=128 (with only
the big core enabled), a Lichee Pi with RVV 0.7.1 and a VF2 with no
vector.

A compiler with RVV 1.0 support must be used to build OpenBLAS for
riscv64 when DYNAMIC_ARCH=1.

Signed-off-by: Mark Ryan <markdryan@rivosinc.com>

1 year ago

1 Commits (f66ca05b313cf936eb8f75cc7ea1a87549e5b2a9)