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ggml : add run-time detection of neon, i8mm and sve (#9331)

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* ggml: Added run-time detection of neon, i8mm and sve

Adds run-time detection of the Arm instructions set features
neon, i8mm and sve for Linux and Apple build targets.

* ggml: Extend feature detection to include non aarch64 Arm arch

* ggml: Move definition of ggml_arm_arch_features to the global data section
This commit is contained in:
Dan Johansson 2024-09-28 14:06:16 +02:00 • committed by GitHub
parent 89f9944981
commit 6a0f779484
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GPG key ID: B5690EEEBB952194
5 changed files with 93 additions and 32 deletions
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101
ggml/src/ggml.c
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@ -39,9 +39,6 @@
#include <unistd.h>
#endif
#if defined(__ARM_FEATURE_SVE)
int ggml_sve_cnt_b = 0;
#endif
#if defined(__ARM_FEATURE_SVE) || defined(__ARM_FEATURE_MATMUL_INT8)
#undef GGML_USE_LLAMAFILE
#endif
@ -455,6 +452,15 @@ static ggml_fp16_t ggml_table_gelu_quick_f16[1 << 16];
// precomputed f32 table for f16 (256 KB) (ggml-impl.h)
float ggml_table_f32_f16[1 << 16];
#if defined(__ARM_ARCH)
struct ggml_arm_arch_features_type {
int has_neon;
int has_i8mm;
int has_sve;
int sve_cnt;
} ggml_arm_arch_features = {-1, -1, -1, 0};
#endif
GGML_CALL const char * ggml_status_to_string(enum ggml_status status) {
switch (status) {
case GGML_STATUS_ALLOC_FAILED: return "GGML status: error (failed to allocate memory)";
@ -3673,6 +3679,66 @@ static inline int ggml_up(int n, int m) {
////////////////////////////////////////////////////////////////////////////////
#if defined(__ARM_ARCH)
#if defined(__linux__) && defined(__aarch64__)
#include <sys/auxv.h>
#elif defined(__APPLE__)
#include <sys/sysctl.h>
#endif
static void ggml_init_arm_arch_features(void) {
#if defined(__linux__) && defined(__aarch64__)
uint32_t hwcap = getauxval(AT_HWCAP);
uint32_t hwcap2 = getauxval(AT_HWCAP2);
ggml_arm_arch_features.has_neon = !!(hwcap & HWCAP_ASIMD);
ggml_arm_arch_features.has_i8mm = !!(hwcap2 & HWCAP2_I8MM);
ggml_arm_arch_features.has_sve = !!(hwcap & HWCAP_SVE);
#if defined(__ARM_FEATURE_SVE)
ggml_arm_arch_features.sve_cnt = PR_SVE_VL_LEN_MASK & prctl(PR_SVE_GET_VL);
#endif
#elif defined(__APPLE__)
int oldp = 0;
size_t size = sizeof(oldp);
if (sysctlbyname("hw.optional.AdvSIMD", &oldp, &size, NULL, 0) != 0) {
oldp = 0;
}
ggml_arm_arch_features.has_neon = oldp;
if (sysctlbyname("hw.optional.arm.FEAT_I8MM", &oldp, &size, NULL, 0) != 0) {
oldp = 0;
}
ggml_arm_arch_features.has_i8mm = oldp;
ggml_arm_arch_features.has_sve = 0;
ggml_arm_arch_features.sve_cnt = 0;
#else
// Run-time CPU feature detection not implemented for this platform, fallback to compile time
#if defined(__ARM_NEON)
ggml_arm_arch_features.has_neon = 1;
#else
ggml_arm_arch_features.has_neon = 0;
#endif
#if defined(__ARM_FEATURE_MATMUL_INT8)
ggml_arm_arch_features.has_i8mm = 1;
#else
ggml_arm_arch_features.has_i8mm = 0;
#endif
#if defined(__ARM_FEATURE_SVE)
ggml_arm_arch_features.has_sve = 1;
ggml_arm_arch_features.sve_cnt = 16;
#else
ggml_arm_arch_features.has_sve = 0;
ggml_arm_arch_features.sve_cnt = 0;
#endif
#endif
}
#endif
struct ggml_context * ggml_init(struct ggml_init_params params) {
// make this function thread safe
ggml_critical_section_start();
@ -3723,6 +3789,10 @@ struct ggml_context * ggml_init(struct ggml_init_params params) {
GGML_PRINT_DEBUG("%s: g_state initialized in %f ms\n", __func__, (t_end - t_start)/1000.0f);
}
#if defined(__ARM_ARCH)
ggml_init_arm_arch_features();
#endif
is_first_call = false;
}
@ -3771,12 +3841,6 @@ struct ggml_context * ggml_init(struct ggml_init_params params) {
GGML_ASSERT_ALIGNED(ctx->mem_buffer);
#if defined(__ARM_FEATURE_SVE)
if (!ggml_sve_cnt_b) {
ggml_sve_cnt_b = PR_SVE_VL_LEN_MASK & prctl(PR_SVE_GET_VL);
}
#endif
GGML_PRINT_DEBUG("%s: context initialized\n", __func__);
ggml_critical_section_end();
@ -23578,16 +23642,16 @@ int ggml_cpu_has_fma(void) {
}
int ggml_cpu_has_neon(void) {
#if defined(__ARM_NEON)
return 1;
#if defined(__ARM_ARCH)
return ggml_arm_arch_features.has_neon;
#else
return 0;
#endif
}
int ggml_cpu_has_sve(void) {
#if defined(__ARM_FEATURE_SVE)
return 1;
#if defined(__ARM_ARCH)
return ggml_arm_arch_features.has_sve;
#else
return 0;
#endif
@ -23734,11 +23798,18 @@ int ggml_cpu_has_vsx(void) {
}
int ggml_cpu_has_matmul_int8(void) {
#if defined(__ARM_FEATURE_MATMUL_INT8)
return 1;
#if defined(__ARM_ARCH)
return ggml_arm_arch_features.has_i8mm;
#else
return 0;
#endif
}
int ggml_cpu_get_sve_cnt(void) {
#if defined(__ARM_ARCH)
return ggml_arm_arch_features.sve_cnt;
#else
return 0;
#endif
}
////////////////////////////////////////////////////////////////////////////////