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ggml-cpu: add ggml_thread_cpu_relax with Zihintpause support (llama/17784) 

* ggml-cpu: add ggml_thread_cpu_relax with Zihintpause support

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

* cmake: enable RISC-V zihintpause extension for Spacemit builds

* readme : add ZIHINTPAUSE support for RISC-V

---------

Signed-off-by: Wang Yang <yangwang@iscas.ac.cn>
This commit is contained in:
ixgbe 2025-12-08 16:41:34 +08:00 committed by Georgi Gerganov
parent d6d44fac69
commit c8d0ee2f9f
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GPG Key ID: 449E073F9DC10735
3 changed files with 13 additions and 0 deletions
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1
ggml/CMakeLists.txt
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@ -168,6 +168,7 @@ option(GGML_RVV "ggml: enable rvv" ON)
option(GGML_RV_ZFH "ggml: enable riscv zfh" ON)
option(GGML_RV_ZVFH "ggml: enable riscv zvfh" ON)
option(GGML_RV_ZICBOP "ggml: enable riscv zicbop" ON)
option(GGML_RV_ZIHINTPAUSE "ggml: enable riscv zihintpause " ON)
option(GGML_XTHEADVECTOR "ggml: enable xtheadvector" OFF)
option(GGML_VXE "ggml: enable vxe" ${GGML_NATIVE})

3
ggml/src/ggml-cpu/CMakeLists.txt
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@ -469,6 +469,9 @@ function(ggml_add_cpu_backend_variant_impl tag_name)
if (GGML_RV_ZICBOP)
string(APPEND MARCH_STR "_zicbop")
endif()
if (GGML_RV_ZIHINTPAUSE)
string(APPEND MARCH_STR "_zihintpause")
endif()
list(APPEND ARCH_FLAGS "-march=${MARCH_STR}" -mabi=lp64d)
else()
# Begin with the lowest baseline

9
ggml/src/ggml-cpu/ggml-cpu.c
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@ -490,6 +490,15 @@ static inline void ggml_thread_cpu_relax(void) {
static inline void ggml_thread_cpu_relax(void) {
_mm_pause();
}
#elif defined(__riscv)
static inline void ggml_thread_cpu_relax(void) {
#ifdef __riscv_zihintpause
__asm__ __volatile__ ("pause");
#else
/* Encoding of the pause instruction */
__asm__ __volatile__ (".4byte 0x100000F");
#endif
}
#else
static inline void ggml_thread_cpu_relax(void) {;}
#endif