RISC-V交叉编译Halide时的<= 1异常

Question

尝试了本教程compilation.html在x86主机(Ubuntu20.04)上，但是对于RISC目标体系结构。不幸的是，IR.cpp有一个例外。只有在应用.vectorize(x, 16)时才会出现异常，因此在RISC矢量化支持中存在问题。有什么办法来调试这个吗？

Internal Error at /home/dkurt/Halide/src/IR.cpp:272 triggered by user code at : Condition failed: lanes > 1: Ramp of lanes <= 1

x86目标在本地一切正常。

• 卤化物@ https://github.com/halide/Halide/commit/16243da75944ce9ea8d4e8eb90d6f104f06284ec
• LLVM 15.0.2

#include "Halide.h"

using namespace Halide;

int main(int argc, char** argv) {
    Func brighter;
    Var x, y;

    Param<uint8_t> offset;
    ImageParam input(type_of<uint8_t>(), 2);
    std::vector<Argument> args(2);
    args[0] = input;
    args[1] = offset;

    brighter(x, y) = input(x, y) + offset;

    brighter.bound(x, 0, 64).bound(y, 0, 64);

    brighter.vectorize(x, 16).parallel(y);

    Target target;
    target.os = Target::Linux;
    target.arch = Target::RISCV;
    target.bits = 64;

    std::vector<Target::Feature> features;
    features.push_back(Target::RVV);
    target.set_features(features);

    try {
        brighter.compile_to_static_library("compiled", args, "brighter", target);
    } catch(Halide::InternalError& ex) {
        std::cout << ex.what() << std::endl;
    }
}

Answer 1

通过切换到自定义分支来解决问题。见https://github.com/halide/Halide/issues/7070。