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POAMD APP SDK v2.9 compiler bug
 

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  1. POAMD APP SDK v2.9 compiler bug
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    <p>I'm trying to build a simple program in OpenCL to calculate the value of pi using a Monte Carlo method, I'm using AMD's APP SDK on Intel CPU and AMD GPU, this is the kernel source:</p> <pre><code>#define RAND_MAX 4294967295 float rand(uint *seed) { *seed = *seed * 1103515245 + 12345; float res= *seed % ( RAND_MAX + 1); res/=RAND_MAX; return res; } __kernel void pi(__global uint *seed, __global uint *res) { int idx = get_global_id(0); uint loc_seed= seed[0] + idx; res[idx]=0; float x,y; uint i; for(i=0; i&lt;100000; i++) { x=rand(&amp;loc_seed); y=rand(&amp;loc_seed); if( (x*x+y*y)&gt;1 ) { res[idx] += 1; } } } </code></pre> <p>which does not compile, giving the following output, immediately when calling clBuildProgram causing the whole process to crash:</p> <pre><code>LLVM ERROR: Cannot select: 0x15b01a0: i64 = setcc 0x15aed90, 0x15b02a0, 0x15b2b80 [ORD=16] [ID=34] 0x15aed90: i32 = add 0x15afda0, 0x15af6a0 [ORD=14] [ID=31] 0x15afda0: i32 = mul 0x15af4a0, 0x15afba0 [ORD=13] [ID=28] 0x15af4a0: i32 = add 0x15afaa0, 0x15af6a0 [ORD=9] [ID=26] 0x15afaa0: i32 = mul 0x15aeb90, 0x15afba0 [ORD=8] [ID=25] 0x15aeb90: i32,ch = CopyFromReg 0x1660540, 0x15ae890 [ORD=8] [ID=24] 0x15ae890: i32 = Register %vreg2 [ORD=8] [ID=1] 0x15afba0: i32 = Constant&lt;1103515245&gt; [ORD=8] [ID=2] 0x15af6a0: i32 = Constant&lt;12345&gt; [ORD=9] [ID=3] 0x15afba0: i32 = Constant&lt;1103515245&gt; [ORD=8] [ID=2] 0x15af6a0: i32 = Constant&lt;12345&gt; [ORD=9] [ID=3] 0x15b02a0: i32 = Constant&lt;0&gt; [ORD=16] [ID=10] </code></pre> <p>What's that? I'm sure the problem is somewhere in the kernel source because switching to another kernel file everithing runs just fine..</p> <p>Thanks in advance</p> <p>EDIT: it seems the problem lies in the number 4294967295, which is the largest unsigned int with 32 bits, but the compiler, for some reason, seems not to like it..</p>
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    1. COHave you checked the compiler log with `clGetProgramBuildInfo`?
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      1. POAMD APP SDK v2.9 compiler bug
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    2. COYes but it's useless because the program crashes before reaching that line, as I wrote it crashes immediately after the call to clBuildProgram..
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      1. POAMD APP SDK v2.9 compiler bug
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    3. COWell it is not supposed to crash. You should send a bug report to your compiler vendor. OpenCL is quite new, so compilers have still a few bugs.
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      1. POAMD APP SDK v2.9 compiler bug
      1. USsbabbi
 

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