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<p class="MsoPlainText">Hi,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I’m still missing something on the operations used by the DAG Pattern ISel state machine, in particular operations like ‘OPC_EmitMergeInputChains’.<o:p></o:p></p>
<p class="MsoPlainText">I’ve define an architecture specific intrinsic mapping to the target NOP operation, like this: <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">def : Pat<(int_clp_nop), (NOP)>;<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">In many ‘contexts’, it works perfectly. But prior to ‘TokenFactor’ it fails as in following example:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Total amount of phi nodes to update: 2<o:p></o:p></p>
<p class="MsoPlainText">Node 0 : (0x31d8508, 2147483651)<o:p></o:p></p>
<p class="MsoPlainText">Node 1 : (0x31d8568, 2147483652)<o:p></o:p></p>
<p class="MsoPlainText">Initial selection DAG: BB#1 '_start:while.body'<o:p></o:p></p>
<p class="MsoPlainText">SelectionDAG has 24 nodes:<o:p></o:p></p>
<p class="MsoPlainText"> t0: ch = EntryToken<o:p></o:p></p>
<p class="MsoPlainText"> <span lang="FR-BE">t4: i32,ch = CopyFromReg t0, Register:i32 %vreg1<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE"> t12: i32,ch = CopyFromReg t0, Register:i32 %vreg0<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE"> t13: i32 = add t12, t4<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE"> t15: ch = CopyToReg t0, Register:i32 %vreg2, t13<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE"> t5: ch = llvm.clp.writeapb.i32 t0, TargetConstant:i16<398>, Constant:i32<24574>, t4<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE"> t7: ch = llvm.clp.nop t5, TargetConstant:i16<390><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE"> t8: ch = llvm.clp.nop t7, TargetConstant:i16<390><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE"> t9: ch = llvm.clp.nop t8, TargetConstant:i16<390><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE" style="color:red"> t10: ch = llvm.clp.nop t9, TargetConstant:i16<390><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE"> <span style="background:yellow;mso-highlight:yellow">
t20: ch = TokenFactor t15, t10</span><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE"> t18: i1 = setcc t13, Constant:i32<100>, setlt:ch<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE"> </span>t21: ch = brcond t20, t18, BasicBlock:ch<while.body 0x31d8458><o:p></o:p></p>
<p class="MsoPlainText"> t23: ch = br t21, BasicBlock:ch<while.end 0x31d85c8><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Selecting: t20: ch = TokenFactor t15, t10<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Selecting: t10: ch = llvm.clp.nop t9, TargetConstant:i16<390><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">ISEL: Starting pattern match on root node: t10: ch = llvm.clp.nop t9, TargetConstant:i16<390><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> Initial Opcode index to 5<o:p></o:p></p>
<p class="MsoPlainText"> Skipped scope entry (due to false predicate) at index 8, continuing at 44<o:p></o:p></p>
<p class="MsoPlainText"> Skipped scope entry (due to false predicate) at index 45, continuing at 68<o:p></o:p></p>
<p class="MsoPlainText"> Skipped scope entry (due to false predicate) at index 69, continuing at 92<o:p></o:p></p>
<p class="MsoPlainText"> Skipped scope entry (due to false predicate) at index 93, continuing at 116<o:p></o:p></p>
<p class="MsoPlainText"><span style="color:red"> Match failed at index 120<o:p></o:p></span></p>
<p class="MsoPlainText"> Continuing at 127<o:p></o:p></p>
<p class="MsoPlainText"> Match failed at index 128<o:p></o:p></p>
<p class="MsoPlainText">…<o:p></o:p></p>
<p class="MsoPlainText"><span style="color:red">LLVM ERROR: Cannot select: intrinsic %llvm.clp.nop<o:p></o:p></span></p>
<p class="MsoPlainText">------<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I was expecting a match and a morphing to CLP::NOP at line 121.<o:p></o:p></p>
<p class="MsoPlainText">While investigating the cause in the SelectCode MatcherTable[], it fails on ‘OPC_emitMergInputsChains’.<o:p></o:p></p>
<p class="MsoPlainText">While viewing the dag-combine1-dags graph, the TokenFactor has two chains (blue dashed lines).<o:p></o:p></p>
<p class="MsoPlainText">Is it the cause of the failure? Why such TokenFactor are introduced? Where/how are they removed?<o:p></o:p></p>
<p class="MsoPlainText">Do I have to define something else in my Pattern<> or in the NOP Instruction<>?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">------<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace;color:#3F7F5F">/*116*/</span><span style="font-size:10.0pt;font-family:Monospace;color:black">
</span><span style="font-size:10.0pt;font-family:Monospace;color:#3F7F5F">/*Scope*/</span><span style="font-size:10.0pt;font-family:Monospace;color:black"> 10,
</span><span style="font-size:10.0pt;font-family:Monospace;color:#3F7F5F">/*->127*/</span><span style="font-size:10.0pt;font-family:Monospace"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace;color:#3F7F5F">/*117*/</span><span style="font-size:10.0pt;font-family:Monospace;color:black">
<u>OPC_CheckChild1Integer</u>, 6|128,3</span><span style="font-size:10.0pt;font-family:Monospace;color:#3F7F5F">/*390*/</span><span style="font-size:10.0pt;font-family:Monospace;color:black">,
</span><span style="font-size:10.0pt;font-family:Monospace"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace;color:#3F7F5F">/*120*/</span><span style="font-size:10.0pt;font-family:Monospace;color:black">
<u><span style="background:silver;mso-highlight:silver">OPC_EmitMergeInputChains1_0</span></u>,</span><span style="font-size:10.0pt;font-family:Monospace"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace;color:#3F7F5F">/*121*/</span><span style="font-size:10.0pt;font-family:Monospace;color:black">
<u>OPC_MorphNodeTo</u>, TARGET_VAL(<u>CLP::NOP</u>), 0|<u>OPFL_Chain</u>,</span><span style="font-size:10.0pt;font-family:Monospace"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace;color:black"> 0</span><span style="font-size:10.0pt;font-family:Monospace;color:#3F7F5F">/*#VTs*/</span><span style="font-size:10.0pt;font-family:Monospace;color:black">,
0</span><span style="font-size:10.0pt;font-family:Monospace;color:#3F7F5F">/*#<u>Ops</u>*/</span><span style="font-size:10.0pt;font-family:Monospace;color:black">,
</span><span style="font-size:10.0pt;font-family:Monospace"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace;color:black"> </span><span style="font-size:10.0pt;font-family:Monospace;color:#3F7F5F">//
<u>Src</u>: (intrinsic_void 390:iPTR) - Complexity = 8</span><span style="font-size:10.0pt;font-family:Monospace"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace;color:black">
</span><span style="font-size:10.0pt;font-family:Monospace;color:#3F7F5F">// <u>Dst</u>: (NOP)</span><span style="font-size:10.0pt;font-family:Monospace"><o:p></o:p></span></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">TIA, Dominique T.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span lang="FR-BE">Dominique Torette<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE">System Architect<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-BE">Rue des Chasseurs Ardennais - Liège Science Park - B-4031 Angleur<o:p></o:p></span></p>
<p class="MsoPlainText">Tel: +32 (0) 4 361 81 11 - Fax: +32 (0) 4 361 81 20<o:p></o:p></p>
<p class="MsoPlainText">www.spacebel.be<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span lang="FR-BE"><o:p> </o:p></span></p>
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