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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Justin,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Add this to your TargetLowering constructor, this fixes the mem* issue.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> maxStoresPerMemcpy = 4096;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> maxStoresPerMemmove = 4096;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> maxStoresPerMemset = 4096;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> llvmdev-bounces@cs.uiuc.edu [mailto:llvmdev-bounces@cs.uiuc.edu]
<b>On Behalf Of </b>Justin Holewinski<br>
<b>Sent:</b> Monday, November 14, 2011 7:12 AM<br>
<b>To:</b> Alberto Magni<br>
<b>Cc:</b> llvmdev@cs.uiuc.edu<br>
<b>Subject:</b> Re: [LLVMdev] PTX backend fatal error<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Nov 14, 2011 at 8:57 AM, Alberto Magni <<a href="mailto:alberto.magni86@gmail.com">alberto.magni86@gmail.com</a>> wrote:<o:p></o:p></p>
<p class="MsoNormal">Hi everybody,<br>
<br>
I am testing the PTX backend using the OpenCL NVIDIA SDK benchmarks.<br>
Compiling the Histogram64.cl program I get a several backend errors.<br>
<br>
I isolated one of them in the following kernel program:<br>
<br>
__kernel void kernel_function(__global int *input) {<br>
__local char localArray[16];<br>
for(unsigned int index = 0; index < 16; ++index)<br>
localArray[index] = 0;<br>
input[0] = localArray[get_local_id(0)];<br>
}<br>
<br>
fatal error: error in backend: Cannot select:<br>
0x5810cc0: i32,ch = load 0x57fa148,<br>
0x5810ac0, 0x58105c0<LD1[%arrayidx1], sext<br>
from i8> [ID=9]<br>
0x5810ac0: i32 = add 0x58109c0, 0x5813640 [ORD=113] [ID=8]<br>
0x58109c0: i32 = PTXISD::COPY_ADDRESS 0x5813540 [ID=7]<br>
0x5813540: i32 = TargetGlobalAddress<[16 x i8] addrspace(4)*<br>
@kernel_function.localArray> 0 [ID=4]<br>
0x5813640: i32,ch = load 0x57fa148, 0x5810dc0,<br>
0x58105c0<LD4[%retval.i]> [ORD=110] [ID=5]<br>
0x5810dc0: i32 = FrameIndex<0> [ORD=110] [ID=1]<br>
0x58105c0: i32 = undef [ORD=110] [ID=2]<br>
0x58105c0: i32 = undef [ORD=110] [ID=2]<br>
<br>
The command I am using is:<br>
<br>
clang kernels/<a href="http://fatal_error_test.cl" target="_blank">fatal_error_test.cl</a> -O0 -include ocldef.h -include<br>
<a href="http://builtin_functions_ptx.cl" target="_blank">builtin_functions_ptx.cl</a><br>
-D__x86_64__<br>
-ccc-host-triple ptx32 -Xclang<br>
-target-feature<br>
-Xclang +ptx23 -Xclang<br>
-target-feature<br>
-Xclang +compute20<br>
<br>
Any ideas ?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Unfortunately, this sample will not work at this time. First, the backend does not support i8 types yet. Second, at higher optimization levels, LLVM turns this loop into a memset intrinsic, which is also not yet implemented. :(<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hopefully I'll get some time soon to work on this, and other deficiencies. Patches are always welcome, too.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><br>
Best regards<br>
<br>
Alberto<br>
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev" target="_blank">http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev</a><o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">-- <o:p></o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Justin Holewinski<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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