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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This is fixed by Andrea’s patch about one week ago<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>yalong@multicorewareinc.com<br>
<b>Sent:</b> Friday, July 11, 2014 12:45 AM<br>
<b>To:</b> Matt Arsenault; 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"><span style="font-size:10.5pt;font-family:"Segoe UI","sans-serif";color:black">Hi Matt,<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"> Thank you your replying. I try to use <span style="background:white"> @llvm.convert.to/from.fp16 intrinsics before, I also meet "LLVM ERROR: Cannot select:
fp32_to_fp16" problem, maybe these functions call fptrunc/fpext. Following is detail log:</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:10.0pt;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:Matthew.Arsenault@amd.com">Matt
Arsenault</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 12:51<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>;
<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">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">On 07/09/2014 12:41 PM, Matt Arsenault wrote:<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">On 07/09/2014 03:30 PM,
<a href="mailto:yalong@multicorewareinc.com">yalong@multicorewareinc.com</a> wrote:<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"> 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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<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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%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>
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<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"><br>
I think that support for the half type is only implemented for ARM. Last I tried to use it, I found that none of it works even on x86, and the current handling of the half conversion SDNodes seem to rely on ARM specific assumptions<o:p></o:p></span></p>
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Have you tried using the @llvm.convert.to/from.fp16 intrinsics instead?<o:p></o:p></span></p>
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