OpenCL is an open source programming language created in 2009.
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Open Computing Language (OpenCL) is a framework for writing programs that execute across heterogeneous platforms consisting of central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), field-programmable gate arrays (FPGAs) and other processors or hardware accelerators. OpenCL specifies programming languages (based on C99 and C++11) for programming these devices and application programming interfaces (APIs) to control the platform and execute programs on the compute devices. OpenCL provides a standard interface for parallel computing using task- and data-based parallelism. Read more on Wikipedia...
/* Old-style comment. */
// New-style comment.
typedef float foo_t;
#ifndef ZERO
#define ZERO (0.0)
#endif
#define FOO(x) ((x) + \
ZERO)
__kernel
void foo(__global const foo_t * x, __local foo_t y, const uint n)
{
barrier(CLK_LOCAL_MEM_FENCE);
if (n > 42) {
*x += y;
}
}
// This kernel computes FFT of length 1024. The 1024 length FFT is decomposed into
// calls to a radix 16 function, another radix 16 function and then a radix 4 function
__kernel void fft1D_1024 (__global float2 *in, __global float2 *out,
__local float *sMemx, __local float *sMemy) {
int tid = get_local_id(0);
int blockIdx = get_group_id(0) * 1024 + tid;
float2 data[16];
// starting index of data to/from global memory
in = in + blockIdx; out = out + blockIdx;
globalLoads(data, in, 64); // coalesced global reads
fftRadix16Pass(data); // in-place radix-16 pass
twiddleFactorMul(data, tid, 1024, 0);
// local shuffle using local memory
localShuffle(data, sMemx, sMemy, tid, (((tid & 15) * 65) + (tid >> 4)));
fftRadix16Pass(data); // in-place radix-16 pass
twiddleFactorMul(data, tid, 64, 4); // twiddle factor multiplication
localShuffle(data, sMemx, sMemy, tid, (((tid >> 4) * 64) + (tid & 15)));
// four radix-4 function calls
fftRadix4Pass(data); // radix-4 function number 1
fftRadix4Pass(data + 4); // radix-4 function number 2
fftRadix4Pass(data + 8); // radix-4 function number 3
fftRadix4Pass(data + 12); // radix-4 function number 4
// coalesced global writes
globalStores(data, out, 64);
}| Feature | Supported | Token | Example |
|---|---|---|---|
| MultiLine Comments | ✓ | /* */ | /* A comment */ |
| Comments | ✓ | // A comment |
|
| Line Comments | ✓ | // | // A comment |
| Semantic Indentation | X |