Question

I have some C-CUDA code that contains inline PTX assembly, which compiles OK on Linux with g++ backend.

I need to build it under Windows, and clearly MSVC backend does not recognize inline asm properly - gives errors like "not an asm string". I assume it has to do with syntax this PTX assembly is written, for example:

    asm volatile ("subc.cc.u32 %0, %0, "q2_s";": "+r"(c[2]));
    asm volatile ("subc.cc.u32 %0, %0, "q3_s";": "+r"(c[3]));

I don't know much about assembly, and am wondering - is there some translator from GAS(at&t) style to Intel syntax?

Or is there some workaround to build CUDA kernels to PTX on Linux, and then build PTX & link to remaining code on Windows? I've tried that, but PTX compiler on linux gives kernel functions some unrecognizable _Z-starting names and linker does not know how to link the stuff.

Answer 1

结果证明，问题不是内联汇编，而是预处理，例如例如asm字符串

asm volatile ("subc.cc.u32 %0, %0, "q2_s";": "+r"(c[2]));

依赖于此定义

#define q2_s "0xAF48A03B"

在Linux上，编译时没有错误，但是在Windows上，出现了“预期的asm字符串”错误。因此，Windows的解决方法只是将asm字符串中的十六进制值硬编码，并且与汇编语法无关，抱歉。

Translation of CUDA inline asm from GAS to Intel

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