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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">NEON is an ARM feature and is therefore not supported by MIPS so I assume you are trying to achieve the same effect. As far as I know, the MIPS backend doesn't support half-precision
floating point at the moment.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">There is limited support for the <8 x f16> type when MSA (MIPS SIMD Architecture) is enabled but even then scalar half-precision is not currently supported.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" 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>yalong@multicorewareinc.com<br>
<b>Sent:</b> 09 July 2014 23:31<br>
<b>To:</b> Kevin Qin<br>
<b>Cc:</b> llvmdev<br>
<b>Subject:</b> Re: [LLVMdev] Help!!!!Help!!!! " LLVM ERROR: Cannot select: 0x9fc9680: i32 = fp32_to_fp16 0x9fc0750 [ID=16] " problem!!!!!!!!!!!!!!!!!!<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"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"> Thank you Kevin!!!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"> If I use fptrunc and bitcast realise NEON vcvtt ( I can sure, "fptrunc double %tmp to float" is right, but "fptrunc float %tmp to half" is wrong). My target
platform is MIPS. The command as following:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">NEON:<span style="background:white"> </span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black;background:white"> vcvtt.f16.f32 s2, s0</span><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><br>
<br>
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">llvm Code:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><br>
%Vt_2 = load float* %VFP_s0, align 4 <br>
%Vt3_1 = fptrunc float %Vt_2 to half <br>
%Vt4_1 = bitcast half %Vt3_1 to i16 <br>
%Vt2_2 = bitcast float* %VFP_s2 to <2 x i16>* <br>
%Vrti_1 = load <2 x i16>* %Vt2_2, align 4 <br>
%Vrti_2 = insertelement <2 x i16> %Vrti_1, i16 %Vt4_1, i32 1 <br>
%Vt2_3 = bitcast float* %VFP_s2 to <2 x i16>* <br>
store <2 x i16> %Vrti_2, <2 x i16>* %Vt2_3, align 4 <br>
<br>
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">Error Log:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">LLVM ERROR: Cannot select: 0x9f554b0: ch = store 0x9d0f28c, 0x9f5d900, 0x9f54ba8, 0x9f54b20<ST2[FixedStack0](align=4), trunc to f16> [ID=52] <br>
0x9f5d900: f32,ch = load 0x9f5e290, 0x9f5dd40, 0x9f54b20<LD4[%sunkaddr69]> [ORD=1810] [ID=51] <br>
0x9f5dd40: i32 = add 0x9f55318, 0x9f5e0f8 [ORD=1808] [ID=31] <br>
0x9f55318: i32,ch = CopyFromReg 0x9d0f28c, 0x9f6a3a0 [ORD=1796] [ID=26] <br>
0x9f6a3a0: i32 = Register %vreg32 [ORD=1796] [ID=1] <br>
0x9f5e0f8: i32 = Constant<64> [ORD=1808] [ID=17] <br>
0x9f54b20: i32 = undef [ORD=1797] [ID=6] <br>
0x9f54ba8: i32 = FrameIndex<0> [ID=24] <br>
0x9f54b20: i32 = undef [ORD=1797] [ID=6] <br>
In function: testVCVTT32TO16Function <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"><a href="mailto:yalong@multicorewareinc.com">yalong@multicorewareinc.com</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="background:#EFEFEF"><b><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:black">From:</span></b><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:black"> <a href="mailto:kevinqindev@gmail.com">Kevin
Qin</a><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:#EFEFEF"><b><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:black">Date:</span></b><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:black"> 2014-07-09 00:03<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:#EFEFEF"><b><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:black">To:</span></b><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:black"> <a href="mailto:yalong@multicorewareinc.com">yalong@multicorewareinc.com</a><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:#EFEFEF"><b><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:black">CC:</span></b><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:black"> <a href="mailto:llvmdev@cs.uiuc.edu">llvmdev</a><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:#EFEFEF"><b><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:black">Subject:</span></b><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:black"> Re: [LLVMdev] Help!!!!Help!!!! " LLVM
ERROR: Cannot select: 0x9fc9680: i32 = fp32_to_fp16 0x9fc0750 [ID=16] " problem!!!!!!!!!!!!!!!!!!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">Hi,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">Can you show us the command line you are using? At least can you tell us the backend you tried on? If you can upload the test case as well, it will be very useful
to find out the problem.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">Kevin<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">2014-07-10 1:53 GMT+08:00
<a href="mailto:yalong@multicorewareinc.com">yalong@multicorewareinc.com</a> <<a href="mailto:yalong@multicorewareinc.com" target="_blank">yalong@multicorewareinc.com</a>>:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">Hi all, <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"> I am new to llvm. I need help. Thank you every!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"> I want to realize vcvtt.f16.f32 NEON instruction by llvm. This instruction covert top-16bits of a single type to f16. I use the intrinsics function llvm.convert.to.fp16,
but cannot llc ,<b> <span style="background:white">I meet is following problem</span></b><span style="background:white"> :</span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">LLVM ERROR: Cannot select: 0x9fc9680: i32 = fp32_to_fp16 0x9fc0750 [ID=16]
<br>
0x9fc0750: f32,ch = load 0x3aafd68, 0x9fc2a20, 0x9feaab0<LD4[%sunkaddr85033]> [ORD=125117] [ID=15]
<br>
0x9fc2a20: i32 = add 0x9fed880, 0x9fd9ea0 [ORD=125115] [ID=13] <br>
0x9fed880: i32,ch = CopyFromReg 0x3aafd68, 0x9fbea90 [ORD=125114] [ID=9] <br>
0x9fbea90: i32 = Register %vreg13999 [ORD=125114] [ID=1] <br>
0x9fd9ea0: i32 = Constant<80> [ORD=125115] [ID=2] <br>
0x9feaab0: i32 = undef [ORD=125117] [ID=4] <br>
In function: internal_function_69 <br>
Command exited with non-zero status 1<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"> If I change the method, I use " %1 = <span style="background:white">fptrunc float %0 to half ", then " %2 = bitcast half %1 to i16", I meet samiliar problem,
<b>the log is following</b>:</span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">LLVM ERROR: Cannot select: 0x9f554b0: ch = store 0x9d0f28c, 0x9f5d900, 0x9f54ba8, 0x9f54b20<ST2[FixedStack0](align=4), trunc to f16> [ID=52]
<br>
0x9f5d900: f32,ch = load 0x9f5e290, 0x9f5dd40, 0x9f54b20<LD4[%sunkaddr69]> [ORD=1810] [ID=51]
<br>
0x9f5dd40: i32 = add 0x9f55318, 0x9f5e0f8 [ORD=1808] [ID=31] <br>
0x9f55318: i32,ch = CopyFromReg 0x9d0f28c, 0x9f6a3a0 [ORD=1796] [ID=26] <br>
0x9f6a3a0: i32 = Register %vreg32 [ORD=1796] [ID=1] <br>
0x9f5e0f8: i32 = Constant<64> [ORD=1808] [ID=17] <br>
0x9f54b20: i32 = undef [ORD=1797] [ID=6] <br>
0x9f54ba8: i32 = FrameIndex<0> [ID=24] <br>
0x9f54b20: i32 = undef [ORD=1797] [ID=6] <br>
In function: testVCVTT32TO16Function <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"> Anyone can help me?? Thank you again.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#888888"><a href="mailto:yalong@multicorewareinc.com" target="_blank">yalong@multicorewareinc.com</a><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><br>
_______________________________________________<br>
LLVM Developers mailing list<br>
<a href="mailto:LLVMdev@cs.uiuc.edu">LLVMdev@cs.uiuc.edu</a> <a href="http://llvm.cs.uiuc.edu" target="_blank">
http://llvm.cs.uiuc.edu</a><br>
<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></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><br>
<br clear="all">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">--
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">Best Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">Kevin Qin<o:p></o:p></span></p>
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