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<p class="MsoNormal"><span style="color:#0070C0">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0">I’m try to lower the store LLVM-IR instruction as per the following LLVM IR program:<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">*** IR Dump After Module Verifier ***<o:p></o:p></p>
<p class="MsoNormal">define void @storeloadi32() {<o:p></o:p></p>
<p class="MsoNormal"> %ptr = alloca i32<o:p></o:p></p>
<p class="MsoNormal"> store volatile i32 <span style="background:lime;mso-highlight:lime">
12</span>, i32* %<span style="background:lime;mso-highlight:lime">ptr</span><o:p></o:p></p>
<p class="MsoNormal"> ret void<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#0070C0">The target instruction is associated to the store like this:<o:p></o:p></span></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"> def MOVSUTO_A_iSLr : CLPFPU_A_iSLr<0b1000001101,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace"> (ins IMM32Operand:$ImmA, FPUaRegisterOperand:$RegB),<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace"> (outs ),<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><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"> "movsuto_a\t$ImmA,$RegB",<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Monospace">
<span style="background:yellow;mso-highlight:yellow">[(<span style="color:#1A1A1A">store
</span>i32:$ImmA, i16:$RegB)],</span>NoItinerary> {<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#0070C0">The selection DAG seems to be correct, but a FrameIndex of 0 as been introduced :<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Optimized legalized selection DAG: BB#0 'storeloadi32:'<o:p></o:p></p>
<p class="MsoNormal">SelectionDAG has 6 nodes:<o:p></o:p></p>
<p class="MsoNormal"> t0: ch = EntryToken<o:p></o:p></p>
<p class="MsoNormal"> t5: ch = store<Volatile ST4[%ptr]> t0, Constant:i32<12>, FrameIndex:i16<0>, undef:i16<o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-BE"> t6: ch = CLPISD::RET_FLAG t5<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-BE"><o:p> </o:p></span></p>
<p class="MsoNormal">ISEL: Starting pattern match on root node: t5: ch = store<Volatile ST4[%<span style="background:lime;mso-highlight:lime">ptr</span>]> t0, Constant:i32<<span style="background:lime;mso-highlight:lime">12</span>>,
<span style="background:yellow;mso-highlight:yellow">FrameIndex:i16<</span><span style="background:lime;mso-highlight:lime">0</span><span style="background:yellow;mso-highlight:yellow">>,</span> undef:i16<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#0070C0"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0">The lowering correctly catches the store and morphs to right</span>
<span style="color:#0070C0">MOVSUTO_A_iSLr MC instruction:<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> Initial Opcode index to 331<o:p></o:p></p>
<p class="MsoNormal"> Skipped scope entry (due to false predicate) at index 339, continuing at 354<o:p></o:p></p>
<p class="MsoNormal"> <span style="background:lime;mso-highlight:lime">Morphed node: t5: ch = MOVSUTO_A_iSLr<Mem:Volatile ST4[%ptr]> Constant:i32<12>,</span>
<span style="background:yellow;mso-highlight:yellow">FrameIndex:i16<0>, t0</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="background:lime;mso-highlight:lime">ISEL: Match complete!</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#0070C0">Then instruction selection try to lower the FrameIndex node !!! This failed…<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">ISEL: Starting pattern match on root node: t2: i16 = <span style="background:yellow;mso-highlight:yellow">
FrameIndex<0></span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> Initial Opcode index to 0<o:p></o:p></p>
<p class="MsoNormal"> Match failed at index 0<o:p></o:p></p>
<p class="MsoNormal">LLVM ERROR: <span style="background:yellow;mso-highlight:yellow">
Cannot select: t2: i16 = FrameIndex<0></span><o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="FR-BE" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0">How to discard this FrameIndex<0> ?<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><br>
<br>
<br>
<br>
<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/2011/06/image-sign-sbp.jpg" alt="http://www.spacebel.be/wp-content/uploads/2011/06/image-sign-sbp.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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<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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