diff options
Diffstat (limited to 'alc/cpu_caps.cpp')
| -rw-r--r-- | alc/cpu_caps.cpp | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/alc/cpu_caps.cpp b/alc/cpu_caps.cpp new file mode 100644 index 00000000..9470d7a0 --- /dev/null +++ b/alc/cpu_caps.cpp @@ -0,0 +1,147 @@ + +#include "config.h" + +#include "cpu_caps.h" + +#ifdef HAVE_INTRIN_H +#include <intrin.h> +#endif +#ifdef HAVE_CPUID_H +#include <cpuid.h> +#endif + +#include <cctype> +#include <fstream> +#include <string> + +#include "logging.h" + + +int CPUCapFlags{0}; + +namespace { + +#if defined(HAVE_GCC_GET_CPUID) \ + && (defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64)) +using reg_type = unsigned int; +inline void get_cpuid(unsigned int f, reg_type *regs) +{ __get_cpuid(f, ®s[0], ®s[1], ®s[2], ®s[3]); } +#define CAN_GET_CPUID +#elif defined(HAVE_CPUID_INTRINSIC) \ + && (defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64)) +using reg_type = int; +inline void get_cpuid(unsigned int f, reg_type *regs) +{ (__cpuid)(regs, f); } +#define CAN_GET_CPUID +#endif + +} // namespace + + +void FillCPUCaps(int capfilter) +{ + int caps{0}; + +/* FIXME: We really should get this for all available CPUs in case different + * CPUs have different caps (is that possible on one machine?). + */ +#ifdef CAN_GET_CPUID + union { + reg_type regs[4]; + char str[sizeof(reg_type[4])]; + } cpuinf[3]{}; + + get_cpuid(0, cpuinf[0].regs); + if(cpuinf[0].regs[0] == 0) + ERR("Failed to get CPUID\n"); + else + { + const reg_type maxfunc{cpuinf[0].regs[0]}; + + get_cpuid(0x80000000, cpuinf[0].regs); + const reg_type maxextfunc{cpuinf[0].regs[0]}; + + TRACE("Detected max CPUID function: 0x%x (ext. 0x%x)\n", maxfunc, maxextfunc); + + TRACE("Vendor ID: \"%.4s%.4s%.4s\"\n", cpuinf[0].str+4, cpuinf[0].str+12, cpuinf[0].str+8); + if(maxextfunc >= 0x80000004) + { + get_cpuid(0x80000002, cpuinf[0].regs); + get_cpuid(0x80000003, cpuinf[1].regs); + get_cpuid(0x80000004, cpuinf[2].regs); + TRACE("Name: \"%.16s%.16s%.16s\"\n", cpuinf[0].str, cpuinf[1].str, cpuinf[2].str); + } + + if(maxfunc >= 1) + { + get_cpuid(1, cpuinf[0].regs); + if((cpuinf[0].regs[3]&(1<<25))) + caps |= CPU_CAP_SSE; + if((caps&CPU_CAP_SSE) && (cpuinf[0].regs[3]&(1<<26))) + caps |= CPU_CAP_SSE2; + if((caps&CPU_CAP_SSE2) && (cpuinf[0].regs[2]&(1<<0))) + caps |= CPU_CAP_SSE3; + if((caps&CPU_CAP_SSE3) && (cpuinf[0].regs[2]&(1<<19))) + caps |= CPU_CAP_SSE4_1; + } + } +#else + /* Assume support for whatever's supported if we can't check for it */ +#if defined(HAVE_SSE4_1) +#warning "Assuming SSE 4.1 run-time support!" + caps |= CPU_CAP_SSE | CPU_CAP_SSE2 | CPU_CAP_SSE3 | CPU_CAP_SSE4_1; +#elif defined(HAVE_SSE3) +#warning "Assuming SSE 3 run-time support!" + caps |= CPU_CAP_SSE | CPU_CAP_SSE2 | CPU_CAP_SSE3; +#elif defined(HAVE_SSE2) +#warning "Assuming SSE 2 run-time support!" + caps |= CPU_CAP_SSE | CPU_CAP_SSE2; +#elif defined(HAVE_SSE) +#warning "Assuming SSE run-time support!" + caps |= CPU_CAP_SSE; +#endif +#endif +#ifdef HAVE_NEON + al::ifstream file{"/proc/cpuinfo"}; + if(!file.is_open()) + ERR("Failed to open /proc/cpuinfo, cannot check for NEON support\n"); + else + { + std::string features; + + auto getline = [](std::istream &f, std::string &output) -> bool + { + while(f.good() && f.peek() == '\n') + f.ignore(); + return std::getline(f, output) && !output.empty(); + }; + while(getline(file, features)) + { + if(features.compare(0, 10, "Features\t:", 10) == 0) + break; + } + file.close(); + + size_t extpos{9}; + while((extpos=features.find("neon", extpos+1)) != std::string::npos) + { + if((extpos == 0 || std::isspace(features[extpos-1])) && + (extpos+4 == features.length() || std::isspace(features[extpos+4]))) + { + caps |= CPU_CAP_NEON; + break; + } + } + } +#endif + + TRACE("Extensions:%s%s%s%s%s%s\n", + ((capfilter&CPU_CAP_SSE) ? ((caps&CPU_CAP_SSE) ? " +SSE" : " -SSE") : ""), + ((capfilter&CPU_CAP_SSE2) ? ((caps&CPU_CAP_SSE2) ? " +SSE2" : " -SSE2") : ""), + ((capfilter&CPU_CAP_SSE3) ? ((caps&CPU_CAP_SSE3) ? " +SSE3" : " -SSE3") : ""), + ((capfilter&CPU_CAP_SSE4_1) ? ((caps&CPU_CAP_SSE4_1) ? " +SSE4.1" : " -SSE4.1") : ""), + ((capfilter&CPU_CAP_NEON) ? ((caps&CPU_CAP_NEON) ? " +NEON" : " -NEON") : ""), + ((!capfilter) ? " -none-" : "") + ); + CPUCapFlags = caps & capfilter; +} |