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...ave a question about the way sub-registers are spilled and restored > that is related to the changes I made in r192119. > > Suppose I have the following piece of code with four > instructions. %vreg0 and %vreg1 consist of two sub-registers indexed > by sub_lo and sub_hi. > > instr0 %vreg0<def> > instr1 %vreg1:sub_lo<def,read-undef> > instr2 %vreg0<use> > instr3 %vreg1:sub_hi<def> > > If register allocator decides to insert spill and restore instructions > for %vreg0, will it spill the whole register that includes > sub-registers...

...have a question about the way sub-registers are spilled and restored > that is related to the changes I made in r192119. > > Suppose I have the following piece of code with four > instructions. %vreg0 and %vreg1 consist of two sub-registers indexed by > sub_lo and sub_hi. > > instr0 %vreg0<def> > instr1 %vreg1:sub_lo<def,read-undef> > instr2 %vreg0<use> > instr3 %vreg1:sub_hi<def> > > If register allocator decides to insert spill and restore instructions > for %vreg0, will it spill the whole register that includes sub-registers lo &...

...ave a question about the way sub-registers are spilled and restored that is related to the changes I made in r192119. >> >> Suppose I have the following piece of code with four instructions. %vreg0 and %vreg1 consist of two sub-registers indexed by sub_lo and sub_hi. >> >> instr0 %vreg0<def> >> instr1 %vreg1:sub_lo<def,read-undef> >> instr2 %vreg0<use> >> instr3 %vreg1:sub_hi<def> >> >> If register allocator decides to insert spill and restore instructions for %vreg0, will it spill the whole register that includes sub-r...

I've been working on patches to improve subregister liveness tracking on llvm and I wanted to inform the llvm community about the overal design/motivation for them. I will send the patches to llvm-commits later today. Greetings Matthias Braun Subregisters in llvm ==================== Some targets can access registers in different ways resulting in wider or narrower accesses. For