asm | : running : An x86-64 assembler written in Go | Video Game library

 by   akyoto Go Version: Current License: Non-SPDX

kandi X-RAY | asm Summary

kandi X-RAY | asm Summary

asm is a Go library typically used in Gaming, Video Game applications. asm has no bugs, it has no vulnerabilities and it has low support. However asm has a Non-SPDX License. You can download it from GitHub.

An x86-64 assembler written in Go. It is used by the Q programming language for machine code generation.
Support
    Quality
      Security
        License
          Reuse

            kandi-support Support

              asm has a low active ecosystem.
              It has 65 star(s) with 5 fork(s). There are 1 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              asm has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of asm is current.

            kandi-Quality Quality

              asm has 0 bugs and 0 code smells.

            kandi-Security Security

              asm has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              asm code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              asm has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

            kandi-Reuse Reuse

              asm releases are not available. You will need to build from source code and install.

            Top functions reviewed by kandi - BETA

            kandi has reviewed asm and discovered the below as its top functions. This is intended to give you an instant insight into asm implemented functionality, and help decide if they suit your requirements.
            • New creates a new ELF64 from an Assembler .
            • main is the main function .
            • bitsNeeded returns the number required for a number
            • NewStrings returns a new Strings structure .
            • Jump jumps the given label .
            • ModRM returns the value of the modulus of the receiver .
            • Sib creates a new SIB from a scale .
            • REX returns a 32 bit value .
            • NewRaw returns a new Raw .
            • calculatePadding returns padding
            Get all kandi verified functions for this library.

            asm Key Features

            No Key Features are available at this moment for asm.

            asm Examples and Code Snippets

            No Code Snippets are available at this moment for asm.

            Community Discussions

            QUESTION

            How to print the register number with gcc-style inline assembly?
            Asked 2022-Mar-14 at 15:38

            Inspired by a recent question.

            One use case for gcc-style inline assembly is to encode instructions neither compiler nor assembler are aware of. For example, I gave this example for how to use the rdrand instruction on a toolchain too old to support it:

            ...

            ANSWER

            Answered 2022-Mar-14 at 15:38

            I've actually had the same problem and came up with the following solution.

            Source https://stackoverflow.com/questions/71354999

            QUESTION

            Motorola 68000 assembler syntax for Program Counter Indirect with Index
            Asked 2022-Mar-02 at 01:39

            I've been putting together my own disassembler for Sega Mega Drive ROMs, basing my initial work on the MOTOROLA M68000 FAMILY Programmer’s Reference Manual. Having disassembled a considerable chunk of the ROM, I've attempted to reassemble this disassembled output, using VASM as it can accept the Motorola assembly syntax, using its mot syntax module.

            Now, for the vast majority of the reassembly, this has worked well, however there is one wrinkle with operations that have effective addresses defined by the "Program Counter Indirect with Index (8-Bit Displacement) Mode". Given that I'm only now learning Motorola 68000 assembly, I wanted to confirm my understanding and to ask: what is the proper syntax for these operations?

            Interpretation

            For example, if I have two words:

            ...

            ANSWER

            Answered 2022-Feb-27 at 12:17

            QUESTION

            Could not resolve com.google.guava:guava:30.1-jre - Gradle project sync failed. Basic functionality will not work properly - in kotlin project
            Asked 2022-Feb-14 at 19:47

            It was a project that used to work well in the past, but after updating, the following errors appear.

            ...

            ANSWER

            Answered 2021-Sep-17 at 11:03

            Add mavenCentral() in Build Script

            Source https://stackoverflow.com/questions/69205327

            QUESTION

            Rust compiler not optimising lzcnt? (and similar functions)
            Asked 2021-Dec-26 at 01:56
            What was done:

            This follows as a result of experimenting on Compiler Explorer as to ascertain the compiler's (rustc's) behaviour when it comes to the log2()/leading_zeros() and similar functions. I came across this result with seems exceedingly both bizarre and concerning:

            Compiler Explorer link

            Code:

            ...

            ANSWER

            Answered 2021-Dec-26 at 01:56

            Old x86-64 CPUs don't support lzcnt, so rustc/llvm won't emit it by default. (They would execute it as bsr but the behavior is not identical.)

            Use -C target-feature=+lzcnt to enable it. Try.

            More generally, you may wish to use -C target-cpu=XXX to enable all the features of a specific CPU model. Use rustc --print target-cpus for a list.

            In particular, -C target-cpu=native will generate code for the CPU that rustc itself is running on, e.g. if you will run the code on the same machine where you are compiling it.

            Source https://stackoverflow.com/questions/70481312

            QUESTION

            Access 64 bit DLL from 32 bit DLL
            Asked 2021-Dec-18 at 11:40

            I'm porting the CEF4Delfi library to Borland C++Builder 5. I make a BPL package from the ported CEF4Delfi source and reference it from my C++Builder 5 code.

            I work on Windows 10 64bit.

            While porting, I'm stuck on importing DLL functions.

            Here is part of the imports:

            ...

            ANSWER

            Answered 2021-Dec-18 at 11:40

            OK, thank you all, for making me understand the process of DLL importing.

            As IInspectable and Remy Lebeau said - the import of DLL requires linking with the LIB. Here is more explanations. Also google - "linking a shared library to executable". It is not important whether it is .so or .dll, the principals are the same.

            One other important point before I give a solution.

            As Remy Lebeau said: several functions

            didn't exist yet (or were introduced shortly before) when BCB5 was released

            Solution First

            Fix for makefile

            Source https://stackoverflow.com/questions/70394871

            QUESTION

            Avoiding hard-number shift of flexible second operand in ASM
            Asked 2021-Dec-17 at 17:29

            This question pertains to the ARM assembly language.

            My question is whether it is possible to use a macro to replace the immediate value in the ASM code to shift a register value so that I don't have to hard-code the number.

            I'm not sure whether the above question makes sense, so I will provide an example with some asm codes:

            So there exist few instructions such as ror instruction in the ARM (https://developer.arm.com/documentation/dui0473/m/arm-and-thumb-instructions/ror), where it is possible to use a register value to rotate the value as we wish:

            ...

            ANSWER

            Answered 2021-Dec-16 at 19:08

            The ARM64 orr immediate instruction takes a bitmask immediate, see Range of immediate values in ARMv8 A64 assembly for an explanation. And GCC has a constraint for an operand of this type: L.

            So I would write:

            Source https://stackoverflow.com/questions/70383795

            QUESTION

            Generate ARM thumb-2 assembly code from android app for Cortex M3 architecture
            Asked 2021-Dec-16 at 16:58

            I want to build an Android app which will be an interface to convert C++ into assembly code for ARM Cortex M3 architecture.

            I'm not an android java developer, and I do mainly arduino projects with C/C++. So I need your help to point me in good directions about how to build an android app with java in Android Studio or similar, which will be able to convert from C++ source code to ASM code M3 Cortex.

            I did some research and found that I need to use ARM NONE EABI GCC compiler to generate ASM code from C++, simple like these command line instructions:

            ...

            ANSWER

            Answered 2021-Dec-16 at 16:58

            A solution would be if in Termux app you will do next things: (more details here)

            1. pkg install proot
            2. pkg install proot-distro
            3. proot-distro install debian
            4. proot-distro login debian

            After that you should be logged in a Debian environment, and you can install almost any Arm packages available on debian repositories.

            For example you should be able to install this Cortex compiler:

            Source https://stackoverflow.com/questions/70233126

            QUESTION

            GEMM kernel implemented using AVX2 is faster than AVX2/FMA on a Zen 2 CPU
            Asked 2021-Dec-14 at 20:40

            I have tried speeding up a toy GEMM implementation. I deal with blocks of 32x32 doubles for which I need an optimized MM kernel. I have access to AVX2 and FMA.

            I have two codes (in ASM, I apologies for the crudeness of the formatting) defined below, one is making use of AVX2 features, the other uses FMA.

            Without going into micro benchmarks, I would like to try to develop an understanding (theoretical) of why the AVX2 implementation is 1.11x faster than the FMA version. And possibly how to improve both versions.

            The codes below are for a 3000x3000 MM of doubles and the kernels are implemented using the classical, naive MM with an interchanged deepest loop. I'm using a Ryzen 3700x/Zen 2 as development CPU.

            I have not tried unrolling aggressively, in fear that the CPU might run out of physical registers.

            AVX2 32x32 MM kernel:

            ...

            ANSWER

            Answered 2021-Dec-13 at 21:36

            Zen2 has 3 cycle latency for vaddpd, 5 cycle latency for vfma...pd. (https://uops.info/).

            Your code with 8 accumulators has enough ILP that you'd expect close to two FMA per clock, about 8 per 5 clocks (if there aren't other bottlenecks) which is a bit less than the 10/5 theoretical max.

            vaddpd and vmulpd actually run on different ports on Zen2 (unlike Intel), port FP2/3 and FP0/1 respectively, so it can in theory sustain 2/clock vaddpd and vmulpd. Since the latency of the loop-carried dependency is shorter, 8 accumulators are enough to hide the vaddpd latency if scheduling doesn't let one dep chain get behind. (But at least multiplies aren't stealing cycles from it.)

            Zen2's front-end is 5 instructions wide (or 6 uops if there are any multi-uop instructions), and it can decode memory-source instructions as a single uop. So it might well be doing 2/clock each multiply and add with the non-FMA version.

            If you can unroll by 10 or 12, that might hide enough FMA latency and make it equal to the non-FMA version, but with less power consumption and more SMT-friendly to code running on the other logical core. (10 = 5 x 2 would be just barely enough, which means any scheduling imperfections lose progress on a dep chain which is on the critical path. See Why does mulss take only 3 cycles on Haswell, different from Agner's instruction tables? (Unrolling FP loops with multiple accumulators) for some testing on Intel.)

            (By comparison, Intel Skylake runs vaddpd/vmulpd on the same ports with the same latency as vfma...pd, all with 4c latency, 0.5c throughput.)

            I didn't look at your code super carefully, but 10 YMM vectors might be a tradeoff between touching two pairs of cache lines vs. touching 5 total lines, which might be worse if a spatial prefetcher tries to complete an aligned pair. Or might be fine. 12 YMM vectors would be three pairs, which should be fine.

            Depending on matrix size, out-of-order exec may be able to overlap inner loop dep chains between separate iterations of the outer loop, especially if the loop exit condition can execute sooner and resolve the mispredict (if there is one) while FP work is still in flight. That's an advantage to having fewer total uops for the same work, favouring FMA.

            Source https://stackoverflow.com/questions/70340734

            QUESTION

            The implementation of Linux kernel current macro
            Asked 2021-Nov-20 at 16:05

            Generally speaking, if we want to use current macro in Linux kernel, we should:

            ...

            ANSWER

            Answered 2021-Nov-20 at 16:05

            The correct header to use is asm/current.h, do not use asm-generic. This applies to anything under asm really. Headers in the asm-generic folder are provided (as the name suggests) as a "generic" default implementation of macros/functions, then each architecture /arch/xxx has its own asm include folder, where if needed it can define the same macros/functions in an architecture-specific way.

            This is done both because it could be actually needed (some archs might have an implementation that is not compatible with the generic one) and for performance since there might be a better and more optimized way of achieving the same result under a specific arch.

            Indeed, if we look at how each arch defines get_current() or get_current_thread_info() we can see that some of them (e.g. alpha, spark) keep a reference to the current task in the thread_info struct and keep a pointer to the current thread_info in a register for performance. Others directly keep a pointer to current in a register (e.g. powerpc 32bit), and others define a global per-cpu variable (e.g. x86). On x86 in particular, the thread_info struct doesn't even have a pointer to the current task, it's a very simple 16-byte structure made to fit in a cache line for performance.

            Source https://stackoverflow.com/questions/70042480

            QUESTION

            In assembly, how to add integers without destroying either operand?
            Asked 2021-Nov-17 at 22:06

            Using AT&T syntax on x86-64, I wish to assemble c = a + b; as

            ...

            ANSWER

            Answered 2021-Nov-17 at 05:12

            Only a few specific GPR instructions have VEX encodings, primarily the BMI1/BMI2 instructions that were added after AVX already existed. See the list in Table 2-28, which has ANDN, BEXTR, BLSI, BLSMSK, BLSR, BZHI, MULX, PDEP, PEXT, RORX, SARX, SHLX, SHRX, as well as the same list in 5.1.16.1. For example, andn's manual entry lists only a VEX encoding, and's manual entry doesn't list any.

            So Intel (unfortunately) didn't introduce a brand new three-operand alternate encoding for the entire instruction set. They just introduced a few specific instructions that take three operands and use VEX for it. In some cases these have similar or equivalent functionality to an existing instruction, e.g. SHLX for SHL with a variable count, and so effectively provide a three-operand version of the previous two-operand instruction, but only in those special cases. There are not equivalent instructions across the board.

            The "old style" two-operand form remains the only version of the add instruction. However, as fuz points out in comments, lea can be a good way to add two registers and write the result to a third, subject to some restrictions on operand size.

            See Using LEA on values that aren't addresses / pointers? for more general things LEA can do, like copy-and-add a constant to a register, or shift-and-add. Compilers already know this and will use lea where appropriate, any time it saves instructions. (Or with some tune options like -mtune=atom for old in-order Atom, will use lea even when they could have used add.)

            If more flexible encodings of common integer instructions other than add existed, like and/xor/sub, gcc -O3 -march=skylake would already be using them in its own asm output, without needing inline asm. Or if alternative instructions could get the job done, like lea for add, would be doing that, so it makes sense to look at compiler output to see what tricks it knows. Trying it yourself would make more sense as something to play around with in a stand-alone .s file that just makes an exit system call, or just to single-step, removing the complexity of using inline asm. (GAS by default doesn't restrict instruction-sets. gcc -march=skylake doesn't pass that on to the assembler, as.)

            In your inline asm, your c operand should be to output-only: =r instead of +r. The old value is overwritten, so there's no need to tell the compiler to produce it as an input. (Like you said, you want c = a+b not c += a+b.)

            Using a single lea as the asm template means you don't need a =&r early-clobber output, because your asm will read all its inputs before writing that output. In your case, having it as an input/output was probably stopping the compiler from choosing the same register as one of the inputs, which could have broken with mov; add.

            Source https://stackoverflow.com/questions/69995238

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install asm

            You can download it from GitHub.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
            Find more information at:

            Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items

            Find more libraries
            CLONE
          • HTTPS

            https://github.com/akyoto/asm.git

          • CLI

            gh repo clone akyoto/asm

          • sshUrl

            git@github.com:akyoto/asm.git

          • Stay Updated

            Subscribe to our newsletter for trending solutions and developer bootcamps

            Agree to Sign up and Terms & Conditions

            Share this Page

            share link

            Explore Related Topics

            Consider Popular Video Game Libraries

            Proton

            by ValveSoftware

            ArchiSteamFarm

            by JustArchiNET

            MinecraftForge

            by MinecraftForge

            byte-buddy

            by raphw

            nes

            by fogleman

            Try Top Libraries by akyoto

            cache

            by akyotoGo

            q

            by akyotoGo

            mgit

            by akyotoGo

            flua

            by akyotoC++

            quality

            by akyotoGo