Intel® FPGA SDK for OpenCL™ Pro Edition: Programming Guide

ID 683846
Date 3/28/2022
Public

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5.9.3. Specifying the Alignment of a Struct

You may instruct the Intel® FPGA SDK for OpenCL™ Offline Compiler to set a specific alignment of a struct data structure.
To specify the struct alignment, insert the aligned(N) attribute prior to the kernel source code for a struct data structure.
For example:
struct __attribute__((aligned(2))) Context { float param1; float param2; int param3; uint param4; }; __kernel void algorithm(__global float * A, __global struct Context * restrict c) { if ( c->param3 ) { // Dereference through a pointer and so on } }
For more information, refer to the Align a Struct with or without Padding section of the Intel® FPGA SDK for OpenCL™ Best Practices Guide.