astonishing facts about aocl compiler : vector_add -> No DSP used, y[i]=x[i] comp er

There are some facts about the AOCL compiler i find astonishing.

aocl version 16.0.2.222, Quartus the same, 10AX115N3F40E2SG on Nallatech board pci385a and bsp.

1) the result of the compilation of the vector_add example is that no DSP is utilized and in fact

performance is terrible

; Resource + Usage ;

+----------------------------------------+---------------------------+

; Logic utilization ; 10% ;

; ALUTs ; 4% ;

; Dedicated logic registers ; 6% ;

; Memory blocks ; 10% ;

; DSP blocks ; 0% ;

why that ?

2) the compilation of this simple vector copy fails with compiler error :

---------------------- riinout.cl ---------------------------------------

__kernel void riinout( __global const float *x,

__global float *restrict y)

{

// get index of the work item

int index = get_global_id(0);

y[index] = x[index];

}

---------------------------------------------------------------------------

$ aoc device/riinout.cl -o bin/riinout.aocx

/media/sda1/home/nallatech/aocl/examples/riinout/riinout/device/riinout.cl:3:46: warning: declaring kernel argument with no 'restrict' may lead to low kernel performance

__kernel void riinout( __global const float *x,

^

1 warning generated.

Error: Compiler Error, not able to generate hardware

---------------------------- quartus_sh_compile.log---------------------------

Info: Initializing Spectra-Q Synthesis...

Info: Project = "top"

Info: Revision = "top_synth"

Warning (125092): Tcl Script File board/board.qip not found

Info (125063): set_global_assignment -name QIP_FILE board/board.qip

Info: qis_default_flow_script.tcl version:# 1

Info: Initializing Spectra-Q Synthesis...

Info: Project = "top"

Info: Revision = "top_synth"

Info (16303): High Performance Effort optimization mode selected -- timing performance will be prioritized at the potential cost of

increased compilation time

Info (16303): High Performance Effort optimization mode selected -- timing performance will be prioritized at the potential cost of

increased compilation time

*** Fatal Error: Segment Violation at (nil)

Module: quartus_syn

Stack Trace:

0x60a43: google::protobuf::FileDescriptorTables::~FileDescriptorTables() + 0x33 (protobuf.so.8)

0x35e7d: __cxa_finalize + 0x9d (c.so.6)

0x35ae2: exit + 0xe2 (c.so.6)

0x1ed24: __libc_start_main + 0x104 (c.so.6)

End-trace

Error (114016): Out of memory in module quartus_syn (1671 megabytes used)

*** Fatal Error: Segment Violation at (nil)

Module: quartus_syn

Stack Trace:

0x60a43: google::protobuf::FileDescriptorTables::~FileDescriptorTables() + 0x33 (protobuf.so.8)

0x35e7d: __cxa_finalize + 0x9d (c.so.6)

0x35ae2: exit + 0xe2 (c.so.6)

0x1ed24: __libc_start_main + 0x104 (c.so.6)

End-trace

Error (114016): Out of memory in module quartus_syn (1677 megabytes used)

*** Fatal Error: Segment Violation at (nil)

Module: quartus_syn

Stack Trace:

0x60a43: google::protobuf::FileDescriptorTables::~FileDescriptorTables() + 0x33 (protobuf.so.8)

0x35e7d: __cxa_finalize + 0x9d (c.so.6)

0x35ae2: exit + 0xe2 (c.so.6)

0x1ed24: __libc_start_main + 0x104 (c.so.6)

End-trace

Error (114016): Out of memory in module quartus_syn (1688 megabytes used)

Error: Failed to synthesize partition

Info: Saving post-synthesis snapshots for 1 partition(s)

*** Fatal Error: Segment Violation at (nil)

Module: quartus_syn

Stack Trace:

0x60a43: google::protobuf::FileDescriptorTables::~FileDescriptorTables() + 0x33 (protobuf.so.8)

0x35e7d: __cxa_finalize + 0x9d (c.so.6)

0x35ae2: exit + 0xe2 (c.so.6)

0x1ed24: __libc_start_main + 0x104 (c.so.6)

End-trace

--------------------------------------------------------------------------------------

Any answer ?

thanks

roberto