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ggml: add RISC-V cpu-feats (#17461) 

* ggml: add RISC-V cpu-feats

Signed-off-by: Wang Yang <yangwang@iscas.ac.cn>

* fix comment[1]

---------

Signed-off-by: Wang Yang <yangwang@iscas.ac.cn>
This commit is contained in:
ixgbe 2025-11-24 19:07:14 +08:00 committed by GitHub
parent 4902eebe33
commit 5f55c385cb
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GPG Key ID: B5690EEEBB952194
3 changed files with 77 additions and 14 deletions
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15
ggml/src/CMakeLists.txt
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@ -328,6 +328,14 @@ function(ggml_add_cpu_backend_variant tag_name)
set(GGML_INTERNAL_${feat} OFF)
endforeach()
foreach (feat ${ARGN})
set(GGML_INTERNAL_${feat} ON)
endforeach()
elseif (GGML_SYSTEM_ARCH STREQUAL "riscv64")
foreach (feat RVV)
set(GGML_INTERNAL_${feat} OFF)
endforeach()
foreach (feat ${ARGN})
set(GGML_INTERNAL_${feat} ON)
endforeach()
@ -402,6 +410,13 @@ if (GGML_CPU_ALL_VARIANTS)
else()
message(FATAL_ERROR "Unsupported s390x target OS: ${CMAKE_SYSTEM_NAME}")
endif()
elseif (GGML_SYSTEM_ARCH STREQUAL "riscv64")
if (CMAKE_SYSTEM_NAME MATCHES "Linux")
ggml_add_cpu_backend_variant(riscv64_0)
ggml_add_cpu_backend_variant(riscv64_v RVV)
else()
message(FATAL_ERROR "Unsupported RISC-V target OS: ${CMAKE_SYSTEM_NAME}")
endif()
else()
message(FATAL_ERROR "GGML_CPU_ALL_VARIANTS not yet supported with ${GGML_SYSTEM_ARCH} on ${CMAKE_SYSTEM_NAME}")
endif()

13
ggml/src/ggml-cpu/CMakeLists.txt
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@ -452,6 +452,7 @@ function(ggml_add_cpu_backend_variant_impl tag_name)
ggml-cpu/spacemit/ime_kernels.h
)
endif()
if(NOT GGML_CPU_ALL_VARIANTS)
set(MARCH_STR "rv64gc")
if (GGML_RV_ZFH)
string(APPEND MARCH_STR "_zfh")
@ -468,6 +469,18 @@ function(ggml_add_cpu_backend_variant_impl tag_name)
string(APPEND MARCH_STR "_zicbop")
endif()
list(APPEND ARCH_FLAGS "-march=${MARCH_STR}" -mabi=lp64d)
else()
# Begin with the lowest baseline
set(ARCH_DEFINITIONS "")
if (GGML_INTERNAL_RVV)
message(STATUS "RVV enabled")
list(APPEND ARCH_DEFINITIONS GGML_USE_RVV)
list(APPEND ARCH_FLAGS -march=rv64gc_v -mabi=lp64d)
endif()
ggml_add_cpu_backend_features(${GGML_CPU_NAME} riscv ${ARCH_DEFINITIONS})
endif()
elseif (GGML_SYSTEM_ARCH STREQUAL "s390x")
message(STATUS "s390x detected")
list(APPEND GGML_CPU_SOURCES

35
ggml/src/ggml-cpu/arch/riscv/cpu-feats.cpp Normal file
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@ -0,0 +1,35 @@
#include "ggml-backend-impl.h"
#if defined(__riscv) && __riscv_xlen == 64
#include <sys/auxv.h>
//https://github.com/torvalds/linux/blob/master/arch/riscv/include/uapi/asm/hwcap.h#L24
#ifndef COMPAT_HWCAP_ISA_V
#define COMPAT_HWCAP_ISA_V (1 << ('V' - 'A'))
#endif
struct riscv64_features {
bool has_rvv = false;
riscv64_features() {
uint32_t hwcap = getauxval(AT_HWCAP);
has_rvv = !!(hwcap & COMPAT_HWCAP_ISA_V);
}
};
static int ggml_backend_cpu_riscv64_score() {
int score = 1;
riscv64_features rf;
#ifdef GGML_USE_RVV
if (!rf.has_rvv) { return 0; }
score += 1 << 1;
#endif
return score;
}
GGML_BACKEND_DL_SCORE_IMPL(ggml_backend_cpu_riscv64_score)
#endif // __riscv && __riscv_xlen == 64