Thanks for pointing me in the right direction. All CPUs that support the CPUID instruction support at least function/level 1, so the compiler should be able to detect that this is what you've requested and elide the first verificatory call to CPUID. Prior to using the CPUID instruction, you should also make sure the processor supports it by testing the 'ID' bit (0x200000) in eflags. xor eax, eax cpuid xor eax, eax cpuid xor eax, eax cpuid rdtsc ; save eax, edx ; code you're going to time goes here xor eax, eax cpuid rdtsc I know this looks strange, but it's actually right. immintrin.h Floating Point AVX Special Math Functions Round the packed single-precision (32-bit) floating-point elements in "a" down to an integer value, and store the results as packed single-precision floating-point elements in "dst". It's supported: * on x86 since GCC IMO the semantic contract for __builtin_cpu_supports should require a string constant as argument, variables should be rejected. La première unité centrale à prendre en charge l'instruction POPCNT était Nehalem d'Intel. Added gcc support. BMI2 requires bit 8 set in EBX of CPUID with EAX=07H, ECX=0H . - - Looking for linux equivalent of __cpuid() intrinsic (porting from Visual Studio) ... the eighth entry on the results screen points to a place where you can download source code which uses the CPUID instruction and displays what it gets back. If the LOCK prefix is used. gcc is missing an intrinsic for that, so everyone has to write inline assembler. RDRAND (for "read random"; known as Intel Secure Key Technology, previously known as Bull Mountain) is an instruction for returning random numbers from an Intel on-chip hardware random number generator which has been seeded by an on-chip entropy source. Due to #pragmas, CPUID functions are compiled with a superset ISAs, so they again won't be inlined. The Intel C++ Compiler has a built-in wrapper, which is the _may_i_use_cpu_feature intrinsic. Hopefully, nothing. Comment 1 H.J. And IMO, general-regs-only target #pragma is an excellent setting for both: cpuid.h and caller bit testing functions. All the fancy wrapper bits are implemented in Python. On dirait que le vôtre est de la ligne Core, qui est plus ancienne. Intel C/C++ Compiler Intrinsic Equivalent ¶ void _mm_lfence(void) Exceptions (All Modes of Operation) ¶ #UD If CPUID.01H:EDX.SSE2[bit 26] = 0. on a 64-bit Linux system, and it just works. Licensing: The computer code and data files described and made available on this web page are distributed under the GNU LGPL license. CPUID, Accessing raw CPUID information is actually very easy, here is a C++ class for that which works in Windows, Linux and OSX: #ifndef CPUID_H gcc provides a cpuid.h header which provides a __cpuid macro (defined differently than MSVC's, mind you) as well as a __get_cpuid … Using __cpuid intrinsic on MSVC to support x64. Alternatively, there's the __cpuid intrinsic which you might want to use, something along the lines of Which, by the way, is often the case when testing for different versions of SSE/AVX. C++ (Cpp) __get_cpuid - 30 examples found. Microsoft’s Visual Studio 2010 and GNU Compiler Collection (gcc) both provide easy mechanisms to query the CPUID instruction from C. In Visual Studio this is provided by an intrinsic from . Intel C/C++ Compiler Intrinsic Equivalent ¶ void _mm_mfence(void) Exceptions (All Modes of Operation) ¶ #UD If CPUID.01H:EDX.SSE2[bit 26] = 0. [c][intel][clang] get cpu info from CPUID intrinsic in clang/gcc - cpuinfo.c intrinsic for CPUID like informations, I just found that the Intel C++ Compiler XE 13.1 offers this intrinsic Now I'm under Linux with g++ and I would like to know if there is a similar Intel® C++ Compiler 19.1 Developer Guide and Reference. The extension module is only responsible for the actual cpuid call. I like that new intrinsic function and I used it already a couple of times. If the LOCK prefix is used. In the gcc, includes code to query the CPUID instruction. You execute CPUID because it's a serializing instruction (can't be executed out of order) and is available in user mode. 3.1 Articles; 3.2 Threads; 3.3 External Links; How to use CPUID Checking CPUID availability . Should add one. This intrinsic is only used for compilation and does not generate any instructions, thus it has zero latency. Similar intrinsics exist for many other useful opcodes. Relative to what the patch in bug 506430 does (once that code is changed to use this code, which I have in a separate patch), all this changes is that: 1. we use a function using the cpuid intrinsic instead of __sse2_available on Windows 2. we honor the -march or -msse* options on gcc-based platforms. Notice that the feature checks at lines 17, 20, and 27 are wrapped with preprocessor checks for whether the bit masks are defined. The a modifier enforces val to be placed in the eax register before the asm command is issued and Nd allows for one-byte constant values to be assembled as constants, freeing the edx register for other cases. If you use another compiler, you must check if that provides its own support of the x86 cpuid instruction. >Proper for name for cpuid . Moreover, the rdtscp intrinsic has the same issue as the cpuid intrinsic. You can … I was able to define my own intrinsic using the asm in cpuid.c as an example, so I got it working. Intel tries very hard to be compatible with GCC on Linux and VC on Windows. Contents I'm fairly certain, ICL doesn't support GNU style inline assembly in Windows mode. The RDTSC Performance Timer written in C++ you don't have to manually insert the assembly opcode (i.e. We're here to answer questions that google results can't. RDRAND is available in Ivy Bridge processors and is part of the Intel 64 and IA-32 instruction set architectures. Initial release. No problem. These are the top rated real world C++ (Cpp) examples of __get_cpuid extracted from open source projects. Using GCC’s CPUID Intrinsics. The intrinsic is __rdtscp(__int32* processor_id), and as you’d expect from __cpuid(), it always emits a move instruction to store the value of ecx in case we wanted it. This is because older toolchain versions that lack support for these features won’t have these masks defined, leading to compilation errors. I haven't tried that. 0F 31) or mnemonic (RDTSC) into your C++ source code. Several years ago, we decided that it was time to support SIMD code in .NET. I/O access OUTx . We introduced the System.Numerics namespace with Vector2, Vector3, Vector4, Vector, and related types. So I need to do it before I loose my mind! You can still use standard inline assembly. As you can see this superinstruction actually combines two different instructions: and and jmp.This combination guarantees that target address for nacljmp is always aligned: you can not use nacljmp (or naclcall) to jump in the middle of 32-byte bundle.And i686-nacl-as guarantees that instructions in your code will never straggle boundary of such bundle. Traditional names are outb, outw and outl respectively. For other compilers, the code is less abstracted because it is hardware dependent. See GCC 4.8 release notes for details: ... cpuid intrinsic is more useful when you want to test for multiple features. Languages: Your posted code will work only with the Microsoft compiler which is part of Visual Studio because it uses the Microsoft specific header file intrin.h (and stdafx.h) and the MS compiler specific __cpuid, __cpuidex[] intrinsic function. You could have done that yourself. Lu 2016-06-25 20:17:40 UTC You need more than an intrinsic to know if AVX or MPX is available. La suggestion d'Hasturkun fonctionnera sur votre système, mais sera implémentée avec plusieurs instructions au lieu d'une seule. ISAs of caller functions and CPUID should match, the best way is to include after the #pragma. 02-24-2009, 06:40 PM #11: Mr_Nuke. This article discusses GCC's compiler intrinsics, emphasizing vector processing on three platforms: X86 (using MMX, SSE and SSE2); Motorola, now Freescale (using Altivec); and ARM Cortex-A (using Neon). 0.1. Sends a 8/16/32-bit value on a I/O location. These types expose a general-purpose API for creating, accessing, and operating on them using hardware vector instructions (when available). gcc 4.8 provides similar feature via __builtin_cpu_supports intrinsic. An intrinsic is often faster than the equivalent inline assembly, because the optimizer has a built-in knowledge of how many intrinsics behave, so some optimizations can be available that are not available when inline assembly is used. For RDTSC there is an inline intrinsic which is portable to at least GCC, Clang, and Visual C++: __rdtsc(). This bit is modifiable only when the CPUID instruction is supported. Sample code is available from Microsoft [3]. I can't remember what about. GCC offers an intermediate between assembly and standard C that can get you more speed and processor features without having to go all the way to assembly language: compiler intrinsics. This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be inc omp lete or b r oke n in various obvious or non-obvious ways. In the x86 architecture, the CPUID instruction (identified by a CPUID opcode) is a processor supplementary instruction (its name derived from CPU IDentification) allowing software to discover details of the processor. Submitted December 16, 2019 . This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be inc omp lete or b r oke n in various obvious or non-obvious ways. GCC has the __builtin_cpu_supports() function on some , GCC has the __builtin_cpu_supports() function on some architectures, so you may want to use that instead. PyCPUID was written by Bram de Greve and for Visual C++ you need: > #include > #pragma intrinsic(__rdtsc) In all cases you simply write __rdtsc() and get a 64-bit integer, no inline asm required. icc and microsoft have a _xgetbv intrinsic for the XGETBV instruction, which is needed to check if AVX or MPX are supported by the kernel. There's no subsitution and no clobber and output list, you have to care of it yourself. 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