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<p class="MsoNormal">Here is a last example to illustrate my concern.<o:p></o:p></p>
<p class="MsoNormal">The problem is about the lowering of node t13.<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Initial selection DAG: BB#0 '_start:entry'<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">SelectionDAG has 44 nodes:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t11: i16 = Constant<0><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t0: ch = EntryToken<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t3: ch = llvm.clp.set.rspa t0, TargetConstant:i16<392>, Constant:i32<64><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><span lang="FR-BE" style="color:#1F497D">t5: ch = llvm.clp.set.rspb t3, TargetConstant:i16<393>, Constant:i32<64><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t8: ch = llvm.clp.set.rspsu t5, TargetConstant:i16<394>, Constant:i32<8><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t13: ch = store<Volatile ST4[@x1](tbaa=<0x3dbe418>)> t8,
<span style="background:lime;mso-highlight:lime">ConstantFP:f32<1.000000e+00>,</span> GlobalAddress:i16<float* @x1> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t16: ch = store<Volatile ST4[@x2](tbaa=<0x3dbe418>)> t13, ConstantFP:f32<2.000000e+00>, GlobalAddress:i16<float* @x2> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t19: ch = store<Volatile ST4[@x3](tbaa=<0x3dbe418>)> t16, ConstantFP:f32<3.000000e+00>, GlobalAddress:i16<float* @x3> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t22: ch = store<Volatile ST4[@x4](tbaa=<0x3dbe418>)> t19, ConstantFP:f32<4.000000e+00>, GlobalAddress:i16<float* @x4> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> </span><span style="color:#1F497D">t23: f32,ch = load<Volatile LD4[@x1](tbaa=<0x3dbe418>)> t22, GlobalAddress:i16<float* @x1> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t24: f32,ch = load<Volatile LD4[@x2](tbaa=<0x3dbe418>)> t23:1, GlobalAddress:i16<float* @x2> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t25: f32,ch = load<Volatile LD4[@x3](tbaa=<0x3dbe418>)> t24:1, GlobalAddress:i16<float* @x3> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t26: f32,ch = load<Volatile LD4[@x4](tbaa=<0x3dbe418>)> t25:1, GlobalAddress:i16<float* @x4> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t27: i16 = GlobalAddress<float (float, float, float, float)* @fdivfaddfmul_a> 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t29: ch,glue = callseq_start t26:1, TargetConstant:i16<4><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t31: ch,glue = CLPISD::COPY_TO_CALLEE_A t29, t23, FrameIndex:i16<0>, t29:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t33: ch,glue = CLPISD::COPY_TO_CALLEE_A t31, t24, FrameIndex:i16<1>, t31:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t35: ch,glue = CLPISD::COPY_TO_CALLEE_A t33, t25, FrameIndex:i16<2>, t33:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t37: ch,glue = CLPISD::COPY_TO_CALLEE_A t35, t26, FrameIndex:i16<3>, t35:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t39: ch,glue = CLPISD::CALLSEQ t37, TargetGlobalAddress:i16<float (float, float, float, float)* @fdivfaddfmul_a> 0, t37:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><span lang="FR-BE" style="color:#1F497D">t41: ch,glue = callseq_end t39, TargetConstant:i16<4>, TargetConstant:i16<0>, t39:1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> </span><span style="color:#1F497D">t42: f32,ch,glue = CLPISD::COPY_TO_CALLER_A t41, FrameIndex:i16<0>, t41:1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t43: ch = CLPISD::RET_FLAG t42:1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">This node is first ‘combined’ into node t51 (bitcast of ConstantFP f32 to Constant i32).<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Combining: t13: ch = store<Volatile ST4[@x1](tbaa=<0x3dbe418>)> t8, ConstantFP:f32<1.000000e+00>, GlobalAddress:i16<float* @x1> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">... into: t51: ch = store<Volatile ST4[@x1](tbaa=<0x3dbe418>)> t8, Constant:i32<1065353216>, GlobalAddress:i16<float* @x1> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">An a new Constant:i32 node (t50) is created.<o:p></o:p></p>
<p class="MsoNormal"><i>The question is: Where in the graph is created this node?<o:p></o:p></i></p>
<p class="MsoNormal">This node seems to be created before the EntryToken !!! Before the initialization of my Stack Pointer registers (RSPA,RSPB,RSPSU).<o:p></o:p></p>
<p class="MsoNormal">Why isn’t it created between t8 and t51?<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><span lang="FR-BE" style="color:#1F497D">t0: ch = EntryToken<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t3: ch = llvm.clp.set.rspa t0, TargetConstant:i16<392>, Constant:i32<64><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t5: ch = llvm.clp.set.rspb t3, TargetConstant:i16<393>, Constant:i32<64><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t8: ch = llvm.clp.set.rspsu t5, TargetConstant:i16<394>, Constant:i32<8><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t51: ch = store<Volatile ST4[@x1](tbaa=<0x3dbe418>)> t8,
<span style="background:lime;mso-highlight:lime">Constant:i32<1065353216></span>, TargetGlobalAddress:i32<float* @x1> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t49: ch = store<Volatile ST4[@x2](tbaa=<0x3dbe418>)> t51, Constant:i32<1073741824>, TargetGlobalAddress:i32<float* @x2> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t47: ch = store<Volatile ST4[@x3](tbaa=<0x3dbe418>)> t49, Constant:i32<1077936128>, TargetGlobalAddress:i32<float* @x3> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t45: ch = store<Volatile ST4[@x4](tbaa=<0x3dbe418>)> t47, Constant:i32<1082130432>, TargetGlobalAddress:i32<float* @x4> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> </span><span style="color:#1F497D">t23: f32,ch = load<Volatile LD4[@x1](tbaa=<0x3dbe418>)> t45, TargetGlobalAddress:i32<float* @x1> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t24: f32,ch = load<Volatile LD4[@x2](tbaa=<0x3dbe418>)> t23:1, TargetGlobalAddress:i32<float* @x2> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t25: f32,ch = load<Volatile LD4[@x3](tbaa=<0x3dbe418>)> t24:1, TargetGlobalAddress:i32<float* @x3> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t26: f32,ch = load<Volatile LD4[@x4](tbaa=<0x3dbe418>)> t25:1, TargetGlobalAddress:i32<float* @x4> 0, undef:i16<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t29: ch,glue = callseq_start t26:1, TargetConstant:i16<4><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t31: ch,glue = CLPISD::COPY_TO_CALLEE_A t29, t23, TargetFrameIndex:i16<0>, t29:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t33: ch,glue = CLPISD::COPY_TO_CALLEE_A t31, t24, TargetFrameIndex:i16<1>, t31:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t35: ch,glue = CLPISD::COPY_TO_CALLEE_A t33, t25, TargetFrameIndex:i16<2>, t33:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t37: ch,glue = CLPISD::COPY_TO_CALLEE_A t35, t26, TargetFrameIndex:i16<3>, t35:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t39: ch,glue = CLPISD::CALLSEQ t37, TargetGlobalAddress:i16<float (float, float, float, float)* @fdivfaddfmul_a> 0, t37:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><span lang="FR-BE" style="color:#1F497D">t41: ch,glue = callseq_end t39, TargetConstant:i16<4>, TargetConstant:i16<0>, t39:1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> </span><span style="color:#1F497D">t42: f32,ch,glue = CLPISD::COPY_TO_CALLER_A t41, TargetFrameIndex:i16<0>, t41:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><span lang="FR-BE" style="color:#1F497D">t43: ch = CLPISD::RET_FLAG t42:1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">ISEL: Starting pattern match on root node: t50: i32 = Constant<1065353216><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> Initial Opcode index to 415<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> TypeSwitch[i32] from 416 to 432<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> <span style="background:lime;mso-highlight:lime">
Morphed node: t50: i32 = MOVSUTO_A_iSLo TargetConstant:i32<1065353216></span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace;color:black;background:silver;mso-highlight:silver">def</span><span style="font-size:10.0pt;font-family:Monospace;color:black"> : Pat<(f32 fpimm:$imm),</span><span style="font-size:10.0pt;font-family:Monospace"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace;color:black"> (MOVSUTO_A_iSLo (bitcast_fpimm_to_i32 f32:$imm))>;</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;background:silver;mso-highlight:silver">def</span><span style="font-size:10.0pt;font-family:Monospace;color:black"> : Pat<(i32 imm:$imm),</span><span style="font-size:10.0pt;font-family:Monospace"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace;color:black"> (MOVSUTO_A_iSLo (trunc_imm i32:$imm))>;</span><span style="font-size:10.0pt;font-family:Monospace"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">===== Instruction selection ends:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Selected selection DAG: BB#0 '_start:entry'<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">SelectionDAG has 42 nodes:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t44: i32 = MOVSUTO_A_iSLo TargetConstant:i32<1082130432><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t46: i32 = MOVSUTO_A_iSLo TargetConstant:i32<1077936128><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t48: i32 = MOVSUTO_A_iSLo TargetConstant:i32<1073741824><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> <span style="background:yellow;mso-highlight:yellow">t50: i32 = MOVSUTO_A_iSLo TargetConstant:i32<1065353216></span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span>
<span lang="FR-BE" style="color:#1F497D">t0: ch = EntryToken<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t3: ch = MOV_SU_iSSs_rspa TargetConstant:i32<64>, t0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t5: ch = MOV_SU_iSSs_rspb TargetConstant:i32<64>, t3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t8: ch = MOV_SU_iSSs_rspsu TargetConstant:i32<8>, t5<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t51: ch = MOV_A_or t50, TargetGlobalAddress:i32<float* @x1> 0, t8<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t49: ch = MOV_A_or t48, TargetGlobalAddress:i32<float* @x2> 0, t51<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t47: ch = MOV_A_or t46, TargetGlobalAddress:i32<float* @x3> 0, t49<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> t45: ch = MOV_A_or t44, TargetGlobalAddress:i32<float* @x4> 0, t47<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"> </span><span style="color:#1F497D">t23: f32,ch = MOV_A_ro TargetGlobalAddress:i32<float* @x1> 0, t45<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t24: f32,ch = MOV_A_ro TargetGlobalAddress:i32<float* @x2> 0, t23:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t25: f32,ch = MOV_A_ro TargetGlobalAddress:i32<float* @x3> 0, t24:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t26: f32,ch = MOV_A_ro TargetGlobalAddress:i32<float* @x4> 0, t25:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t29: ch,glue = CALLSEQ_START TargetConstant:i16<4>, t26:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t31: ch,glue = COPY_TO_CALLEE_A_FROM_GLOBAL TargetGlobalAddress:i32<float* @x1> 0, TargetFrameIndex:i16<0>, t29, t29:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t33: ch,glue = COPY_TO_CALLEE_A_FROM_GLOBAL TargetGlobalAddress:i32<float* @x2> 0, TargetFrameIndex:i16<1>, t31, t31:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t35: ch,glue = COPY_TO_CALLEE_A_FROM_GLOBAL TargetGlobalAddress:i32<float* @x3> 0, TargetFrameIndex:i16<2>, t33, t33:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t37: ch,glue = COPY_TO_CALLEE_A_FROM_GLOBAL TargetGlobalAddress:i32<float* @x4> 0, TargetFrameIndex:i16<3>, t35, t35:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t39: ch,glue = CALLSEQ TargetGlobalAddress:i16<float (float, float, float, float)* @fdivfaddfmul_a> 0, t37, t37:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t41: ch,glue = CALLSEQ_END TargetConstant:i16<4>, TargetConstant:i16<0>, t39, t39:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> t42: f32,ch,glue = COPY_TO_CALLER_A TargetFrameIndex:i16<0>, t41, t41:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><span lang="FR-BE" style="color:#1F497D">t43: ch = RET_FLAG t42:1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE" style="color:#1F497D"><o:p> </o:p></span></p>
<div>
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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""> llvm-dev [mailto:llvm-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>Dominique Torette via llvm-dev<br>
<b>Sent:</b> vendredi 4 mai 2018 12:43<br>
<b>To:</b> llvm-dev@lists.llvm.org<br>
<b>Subject:</b> [llvm-dev] How to constraint instructions reordering from patterns?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is there a kind of scope mechanism in the instruction lowering pattern language in order to control where instructions are inserted or how they are later reordered during the SelectionDiag linearization?<o:p></o:p></p>
<p class="MsoNormal">I know the glue chain that stick instructions together. But such mechanism in not provided in instruction lowering pattern.
<o:p></o:p></p>
<p class="MsoNormal">I’m facing many situations where some patterns are lowered into valid sequences of consecutive SDNodes/Instructions.<o:p></o:p></p>
<p class="MsoNormal">Such sequences have no glue, so later during Instruction Scheduling/SelectionDiag linearization the instructions are moved out of valid context.<o:p></o:p></p>
<p class="MsoNormal">Is there some Instruction flags or others features that could delimit the reordering could cross some limit?<span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">TIA, Dominique Torette<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 lang="FR-BE" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
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<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">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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