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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m trying to optimize the ‘extract_vector_elt’ for my SIMD microcontroller.<o:p></o:p></p>
<p class="MsoNormal">The idea is, during DAG combination, to merge load/extract sequence into an architecture specific node.<o:p></o:p></p>
<p class="MsoNormal">During Instruction Selection, this specific node will be target selected to an architecture specific instruction.<o:p></o:p></p>
<p class="MsoNormal">By ‘combination of DAG nodes’ I understand ‘replacing a set of DAG nodes by an (usually smaller) set of DAG nodes, removing dead nodes and updating all the chains’. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace;color:black">I’m using the setTargetDAGCombine(ISD::EXTRACT_VECTOR_ELT) and build the new
</span>LOAD_VECTOR_EXTRACT node in the PerformDAGCombine().<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none">As per the following trace this work, t59 and params from t58 are merged into t72.<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">During this combination, the chain from t59 to t58 has been merged from new t72 to t57, skipping over t58.<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">So far, so good.<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none">My problem is that this node t58 is not removed from DAG. One reason could be that node t62 is still chained to t58 (due to the fact the extract_vector_elt has no chain).<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">(I also have to investigate why the t57 and t58 are duplicated… This should be another problem).<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><o:p> </o:p></p>
<p class="MsoNormal">I’ve take a look at other DAGCombine implementation for others architecture but I didn’t found an API to explicitly remove a node and trigger overall chain update.<o:p></o:p></p>
<p class="MsoNormal">Could someone point out an example of API for such node deletion during DAG Combination?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards, Dominique T.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> t56: ch = store<Volatile ST8[%l2]> t54:1, t55, FrameIndex:i16<1>, undef:i16<o:p></o:p></p>
<p class="MsoNormal"> t57: v2f32,ch = load<Volatile LD8[%l1]> t56, FrameIndex:i16<0>, undef:i16<o:p></o:p></p>
<p class="MsoNormal"> t58: v2f32,ch = load<Volatile LD8[%l1]> t57:1, FrameIndex:i16<0>, undef:i16<o:p></o:p></p>
<p class="MsoNormal"> <span lang="FR-BE">t59: f32 = extract_vector_elt t58, Constant:i16<0><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE"> t62: ch = llvm.clp.writeapb.f32 t58:1, TargetConstant:i16<397>, Constant:i32<24575>, t59<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE">Combining: t59: f32 = extract_vector_elt t58, Constant:i16<0><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE">... into: t72: f32 = CLPISD::LOAD_VECTOR_EXTRACT_o t57:1, FrameIndex:i16<0>, Constant:i16<0><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE"><o:p> </o:p></span></p>
<p class="MsoNormal">Combining: t56: ch = store<Volatile ST8[%l2]> t54:1, t55, FrameIndex:i16<1>, undef:i16<o:p></o:p></p>
<p class="MsoNormal">... into: t73: ch = CLPISD::STORE_VECTOR_INSERT_oo t53:1, FrameIndex:i16<1>, t53, Constant:i16<1><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> t73: ch = CLPISD::STORE_VECTOR_INSERT_oo t53:1, FrameIndex:i16<1>, t53, Constant:i16<1><o:p></o:p></p>
<p class="MsoNormal"> t57: v2f32,ch = load<Volatile LD8[%l1]> t73, FrameIndex:i16<0>, undef:i16<o:p></o:p></p>
<p class="MsoNormal"> <span style="background:yellow;mso-highlight:yellow">
t58: v2f32,ch = load<Volatile LD8[%l1]> t57:1, FrameIndex:i16<0>, undef:i16</span><o:p></o:p></p>
<p class="MsoNormal"> <span lang="FR-BE">t72: f32 = CLPISD::LOAD_VECTOR_EXTRACT_o
<span style="background:lime;mso-highlight:lime">t57:1</span>, FrameIndex:i16<0>, Constant:i16<0><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE"> t62: ch = llvm.clp.writeapb.f32
<span style="background:yellow;mso-highlight:yellow">t58:1</span>, TargetConstant:i16<397>, Constant:i32<24575>, t72<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE"> </span>t73: ch = MOVATO_B_oo t53, TargetFrameIndex:i16<1>, t53:1<o:p></o:p></p>
<p class="MsoNormal"> t57: v2f32,ch = LOAD_AB_o TargetFrameIndex:i16<0>, t73<o:p></o:p></p>
<p class="MsoNormal"> t58: v2f32,ch = LOAD_AB_o TargetFrameIndex:i16<0>, t57:1<o:p></o:p></p>
<p class="MsoNormal"> t61: i32,ch = LOAD_A_i TargetConstant:i32<24575>, t58:1<o:p></o:p></p>
<p class="MsoNormal"> t72: f32 = LOAD_A_o TargetFrameIndex:i16<0>, t57:1<o:p></o:p></p>
<p class="MsoNormal"> <span lang="FR-BE">t62: ch = WRITEAPB_A_oo t61, t72, t58:1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="FR-BE" style="font-size:12.0pt;font-family:"Times New Roman","serif""><br>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><img width="536" height="49" id="_x0000_i1025" src="http://www.spacebel.be/wp-content/uploads/2018/02/image-sign-sbp30y-1.jpg" alt="http://www.spacebel.be/wp-content/uploads/2018/02/image-sign-sbp30y-1.jpg"></span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-align:center">
<b><span lang="FR-BE" style="font-size:10.0pt">Dominique Torette</span></b><span lang="FR-BE" style="font-size:10.0pt">
<br>
System Architect<br>
Rue des Chasseurs Ardennais - Liège Science Park - B-4031 Angleur <br>
Tel: +32 (0) 4 361 81 11 - Fax: +32 (0) 4 361 81 20 <br>
</span><span style="font-size:10.0pt"><a href="http://www.spacebel.be/"><span lang="FR-BE" style="color:blue">www.spacebel.be</span></a></span><span lang="FR-BE" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="FR-BE"><o:p> </o:p></span></p>
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