Hi all, AVX10 Documentaion has specified ecx value as 0 for AVX10 version and vector size under 0x24 subleaf. Although for ecx=1, the bits are all reserved for now, we still need to specify ecx as 0 to avoid dirty value in ecx.
Bootstrapped on x86-64-pc-linux-gnu. Ok for trunk and backport to GCC14? Reference: Intel Advanced Vector Extensions 10 (Intel AVX10) Architecture Specification https://cdrdv2.intel.com/v1/dl/getContent/784267 It describes the Intel Advanced Vector Extensions 10 Instruction Set Architecture. Thx, Haochen gcc/ChangeLog: * common/config/i386/cpuinfo.h (get_available_features): Correct AVX10 CPUID emulation to specify ecx value. --- gcc/common/config/i386/cpuinfo.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/gcc/common/config/i386/cpuinfo.h b/gcc/common/config/i386/cpuinfo.h index 936039725ab..2ae77d335d2 100644 --- a/gcc/common/config/i386/cpuinfo.h +++ b/gcc/common/config/i386/cpuinfo.h @@ -998,10 +998,10 @@ get_available_features (struct __processor_model *cpu_model, } } - /* Get Advanced Features at level 0x24 (eax = 0x24). */ + /* Get Advanced Features at level 0x24 (eax = 0x24, ecx = 0). */ if (avx10_set && max_cpuid_level >= 0x24) { - __cpuid (0x24, eax, ebx, ecx, edx); + __cpuid_count (0x24, 0, eax, ebx, ecx, edx); version = ebx & 0xff; if (ebx & bit_AVX10_256) switch (version) -- 2.31.1
