<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Apr 23, 2018, at 1:50 AM, Dominique Torette via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Hi,<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">I have a question related to pre-RA scheduling and spill of registers.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">I’m writing a backend for two operands instructions set, so FPU operations result have implicit destination.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">For example, the result of FMUL_A_oo is implicitly the register FA_ROUTMUL.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">I have defined FPUaROUTMULRegisterClass containing only FA_ROUTMUL.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">During the instruction lowering, in order to avoid frequent spill out of FA_ROUTMUL, I systematically copy the result of FMUL_A_oo to a virtual register through a COPY_TO_REGCLASS.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: monospace;" class="">def : Pat<(fdiv f32:$OffsetA, f32:$OffsetB), (COPY_TO_REGCLASS (FDIV_A_oo FPUaOffsetOperand:$OffsetA,FPUaOffsetOperand:$OffsetB),FPUaOffsetClass)>;</span><span style="font-size: 10pt; font-family: monospace;" class=""><o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">The instruction lowering goes as expected all instances of FMUL_A_oo are followed by a COPY, freeing the usage of FPUaROUTMULRegisterClass.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">These COPY are at positions 64B and 112B in the example below. So far, so good.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">My problem arise in some pre-RA instruction scheduling optimization moving these COPY at later positions 104B and 112B.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">The new code sequence leaves two FMUL_A_oo without COPY. So this requires 2 registers from FPUaROUTMULRegisterClass (which only includes FA_ROUTMUL).<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">So spill out need to be inserted where I tried to avoid it by inserting the COPY. :-/<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">This ‘handleMove’ is generated by LiveIntervalAnalysis, but I don’t understand why it is generated and how to avoid this counterproductive optimization.</div></div></div></blockquote><div><br class=""></div><div>‘handleMove’ updates LiveIntervals when a virtual register read/write is moved. The scheduler has a heuristic called biasPhysRegCopy that tries to avoid creating any interference on physregs. You might check -debug-only=machine-scheduler to see why a copy was moved, or just step through the scheduler for a very small test case.</div><div><br class=""></div><div>-Andy</div><div><br class=""></div><blockquote type="cite" class=""><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">TIA, Dominique Torette.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""># *** IR Dump After MachineFunction Printer ***:<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""># Machine code for function addproddivConst: Post SSA<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Function Live Ins: %FA_ROFF1 in %vreg0<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">0B BB#0: derived from LLVM BB %entry<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> Live Ins: %FA_ROFF1<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">16B %vreg0<def> = COPY %FA_ROFF1; FPUaOffsetClass:%vreg0<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">32B %vreg2<def> = MOVSUTO_A_iSLo 1077936128; FPUaOffsetClass:%vreg2<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">48B %vreg3<def> = FMUL_A_oo %vreg0, %vreg2, %RFLAGA<imp-def,dead>; FPUaROUTMULRegisterClass:%vreg3 FPUaOffsetClass:%vreg0,%vreg2<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">64B %vreg4<def> = COPY %vreg3; FPUaOffsetClass:%vreg4 FPUaROUTMULRegisterClass:%vreg3<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">80B %vreg5<def> = MOVSUTO_A_iSLo 1056964608; FPUaOffsetClass:%vreg5<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">96B %vreg6<def> = FMUL_A_oo %vreg0, %vreg5, %RFLAGA<imp-def,dead>; FPUaROUTMULRegisterClass:%vreg6 FPUaOffsetClass:%vreg0,%vreg5<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">112B %vreg7<def> = COPY %vreg6; FPUaOffsetClass:%vreg7 FPUaROUTMULRegisterClass:%vreg6<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">128B %vreg8<def> = FADD_A_oo %vreg4, %vreg7, %RFLAGA<imp-def,dead>; FPUaROUTADDRegisterClass:%vreg8 FPUaOffsetClass:%vreg4,%vreg7<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">144B %FA_ROFF0<def> = COPY %vreg8; FPUaROUTADDRegisterClass:%vreg8<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">176B MOVSUTO_SU_os_rpc %SU_ROFF0<kill>, %RPC<imp-def,dead><o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">192B NOP<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""># End machine code for function addproddivConst.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">handleMove 64B -> 104B: %vreg4<def> = COPY %vreg3; FPUaOffsetClass:%vreg4 FPUaROUTMULRegisterClass:%vreg3<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> %vreg4: [64r,128r:0) 0@64r<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> --> [104r,128r:0) 0@104r<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> %vreg3: [48r,64r:0) 0@48r<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> --> [48r,104r:0) 0@48r<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""># *** IR Dump After Machine Instruction Scheduler ***:<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""># Machine code for function addproddivConst: Post SSA<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Function Live Ins: %FA_ROFF1 in %vreg0<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">0B BB#0: derived from LLVM BB %entry<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> Live Ins: %FA_ROFF1<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">16B %vreg0<def> = COPY %FA_ROFF1; FPUaOffsetClass:%vreg0<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">32B %vreg2<def> = MOVSUTO_A_iSLo 1077936128; FPUaOffsetClass:%vreg2<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">48B %vreg3<def> = FMUL_A_oo %vreg0, %vreg2, %RFLAGA<imp-def,dead>; FPUaROUTMULRegisterClass:%vreg3 FPUaOffsetClass:%vreg0,%vreg2<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">80B %vreg5<def> = MOVSUTO_A_iSLo 1056964608; FPUaOffsetClass:%vreg5<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">96B %vreg6<def> = FMUL_A_oo %vreg0, %vreg5, %RFLAGA<imp-def,dead>; FPUaROUTMULRegisterClass:%vreg6 FPUaOffsetClass:%vreg0,%vreg5<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">104B %vreg4<def> = COPY %vreg3; FPUaOffsetClass:%vreg4 FPUaROUTMULRegisterClass:%vreg3<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">112B %vreg7<def> = COPY %vreg6; FPUaOffsetClass:%vreg7 FPUaROUTMULRegisterClass:%vreg6<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">128B %vreg8<def> = FADD_A_oo %vreg4, %vreg7, %RFLAGA<imp-def,dead>; FPUaROUTADDRegisterClass:%vreg8 FPUaOffsetClass:%vreg4,%vreg7<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">144B %FA_ROFF0<def> = COPY %vreg8; FPUaROUTADDRegisterClass:%vreg8<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">176B MOVSUTO_SU_os_rpc %SU_ROFF0<kill>, %RPC<imp-def,dead><o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">192B NOP<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""># End machine code for function addproddivConst.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span style="font-size: 12pt; font-family: "Times New Roman", serif;" class=""><br class=""><br class=""><br class=""><br class=""><br class=""><br class=""><o:p class=""></o:p></span></p><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="536" style="width: 402pt;"><tbody class=""><tr class=""><td style="padding: 0cm;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: "Times New Roman", serif;" class=""><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" class=""></span><span style="font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td style="border: 1pt solid silver; padding: 0cm;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; text-align: center;" class=""><b class=""><span lang="FR-BE" style="font-size: 10pt;" class="">Dominique Torette</span></b><span lang="FR-BE" style="font-size: 10pt;" class=""><span class="Apple-converted-space"> </span><br class="">System Architect<br class="">Rue des Chasseurs Ardennais - Liège Science Park - B-4031 Angleur<span class="Apple-converted-space"> </span><br class="">Tel: +32 (0) 4 361 81 11 - Fax: +32 (0) 4 361 81 20<span class="Apple-converted-space"> </span><br class=""></span><span style="font-size: 10pt;" class=""><a href="http://www.spacebel.be/" style="color: purple; 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