returning struct by value from ispc-exported function?

[Михаил Усачёв]

Hi all !

I can not get at c++-side a struct by value from exported ispc-function (ispc v1.12 and msvc 2017 are used). Program compiles and runs smoothly (32bit, debug mode), except i have empty fields where i expect non-zero values. In 32bit release mode i have slightly different values. In 64bit i always have zeros at c++-side. I have not found any direct mention or example of such snippet around. Bundled samples contain only void or primitive types returning exported functions.. My code:

kernel.ispc:

struct fp32_2 { float v0, v1; };

export uniform fp32_2 loopback( uniform float arg0, uniform float arg1 ){

    uniform fp32_2 result;

    result.v0 = arg0;

    result.v1 = arg1;

    print( "ispc side: v0 = %\n", result.v0 );

    print( "ispc side: v1 = %\n", result.v1 );

    return result;

    }

kernel.h (generated by ispc, related parts):

#ifndef __ISPC_STRUCT_fp32_2__

#define __ISPC_STRUCT_fp32_2__

struct fp32_2 {

    float v0;

    float v1;

};

#endif

...

extern "C"{

    extern struct fp32_2 loopback(float arg0, float arg1);

}

main.cpp:

#include "kernel.h"

#include <iostream>

int main(){

    auto res = ispc::loopback( 10.0f, 11.0f );

    std::cout << "c++ side: v0 = " << res.v0 << "\n";

    std::cout << "c++ side: v1 = " << res.v1 << "\n";

    }

command line parameters for ispc file compiling (for 32bit debug mode):

ispc %(FullPath) --arch=x86 --target-os=windows --target=sse4-i32x4

-O1 --opt=disable-loop-unroll --emit-obj --outfile=$(IntDir)%(FileName).obj

--header-outfile=%(RootDir)%(Directory)%(Filename).h --werror -g

output (32 bit debug mode or 64bit both modes):

ispc side: v0 = 10.000000

ispc side: v1 = 11.000000

c++ side: v0 = 0

c++ side: v1 = 0

output (32bit release mode):

ispc side: v0 = 10.000000

ispc side: v1 = 11.000000

c++ side: v0 = 0

c++ side: v1 = 5.39308e+33

Each run i got same values. What am i missing or doing wrong ?

Thanks in advance

[Михаил Усачёв]

ispc-program compiled to avx1 always gives zeros. My CPU is AMD fx-8350 (avx1 is supported).

I can not  attach VS 2017 solution (groups.google.com gives me "error occurs")...

[Dmitry Babokin]

Michael,

This is supposed to work. Please file an issue.

Dmitry.

On Mon, Oct 21, 2019 at 2:04 PM Михаил Усачёв <michael...@gmail.com> wrote:

ispc-program compiled to avx1 always gives zeros. My CPU is AMD fx-8350 (avx1 is supported).

I can not  attach VS 2017 solution (groups.google.com gives me "error occurs")...

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