search for: phielim

...asses so that they can be rerun as needed? Is all but LiveIntervals > ok with this as of now? So the good news is that we are slowly moving towards a similar design. The bad news is that we are *slowly* moving... Currently, the register allocator super-pass contains these passes: - LiveVars - PhiElim - TwoAddr - LiveIntervals - Coalescing - RegAlloc Currently, LiveVars requires SSA form, and LiveIntervals only works with simple multi-defs as produced by PhiElim and TwoAddr. That means the pass order is fixed. The plan is to teach PhiELim and TwoAddr how to update LiveIntervals so it can run e...

Hi (Jakob), in reference to the prior message below, I have the following follow-up questions, as I also need a scheduling pass prior to regalloc. I need to do this in order to set VLIW-flags, so that the RA is aware of several MI's per cycle with a redefined LiveRange::overlap-function. On a multiple-issue cycle, a register that gets killed can be reused by another MI - these live ranges do

Hi, thank you for your explanations. In order to get a pre-RA scheduling, I would need something like: - LiveVars - PhiElim - TwoAddr - LiveIntervals - Coalescing - Scheduler (new) - SlotIndexing - LiveIntervals2 (new) - RegAllocMy qeustion then is, is it really so difficult to create the live intervals information, with modifications to the original algorithm, or even from scratch? Normally, it should not have t...

Hi, I have a question regarding StrongPHIElimination. With (weak) PHIElimination, register classes seems to take care of themselves, but with the Strong version, I get illegal virtual register for instruction. In this testcase, I define the PHI operands into a bigger (super) RC, than what the using MI can handle. Weak PHI elim handled this b...

On Nov 14, 2009, at 11:52 PM, Prasanth J wrote: > step 4: > running monolith.bc for 10000 iterations using lli tool and measured the time. How are you doing this? -eric

On Thu, May 26, 2011 at 15:07:24 +0200, Jonas Paulsson wrote: > In order to get a pre-RA scheduling, I would need something like: > - LiveVars > - PhiElim > - TwoAddr > - LiveIntervals > - Coalescing > - Scheduler (new) > - SlotIndexing > - LiveIntervals2 (new) > - RegAlloc > My qeustion then is, is it really so difficult to create the live intervals information, with modifications to the original algorithm, or even fro...

...rvals - Number of original intervals 21 loop-reduce - Number of IV uses strength reduced 4 loop-reduce - Number of PHIs inserted 2 loop-reduce - Number of loop terminating conds optimized 1 machine-licm - Number of machine instructions hoisted out of loops 4 phielim - Number of atomic phis lowered 2 regalloc - Number of copies coalesced 27 regalloc - Number of iterations performed 3 regcoalescing - Number of cross class joins performed 44 regcoalescing - Number of identity moves eliminated after coalescing 1 reg...

Hi all, LLVM is built without debug enabled. Also i am not forcing lli to use interpreter mode. so i dont think the reason is not because of debug build or interpreter mode. *step 1: * compiled the 3 files (generic_replica.c ,xacc.c and dacc.c) with clang-cc to llvm bytecode files using -emit-llvm-bc and (-O0/-O3) options *step 2:* bytecode obtained from step 1 (generic_replica.bc, xacc.bc and

> > PHIElim and TwoAddress passes leave SSA form. > May be a missed something in your code but %vreg48 seems to be there > after PHI elimination. PHIElim tags those kind of registers as being > PHIJoin regs, updating LiveVariables pass, so the regcoalescer is aware > of them (some SSA info is st...

...m> > À : Ivan Llopard <ivanllopard at gmail.com> > Cc : "llvmdev at cs.uiuc.edu" <llvmdev at cs.uiuc.edu> > Envoyé le : Jeudi 25 octobre 2012 17h54 > Objet : Re: [LLVMdev] RegisterCoalescing Pass seems to ignore part of CFG. > > > >> >> PHIElim and TwoAddress passes leave SSA form. >> May be a missed something in your code but %vreg48 seems to be there >> after PHI elimination. PHIElim tags those kind of registers as being >> PHIJoin regs, updating LiveVariables pass, so the regcoalescer is aware >> of them...

...ignoring the body block that can modify vreg48 value, and thus vreg6 value. > I don't know if I should manually tell the pass that it's not in SSA mode (I assume that previous pass like 2 address simplification pass does it), if I miss something in my LLVM IR, > or if it's a bug. PHIElim and TwoAddress passes leave SSA form. May be a missed something in your code but %vreg48 seems to be there after PHI elimination. PHIElim tags those kind of registers as being PHIJoin regs, updating LiveVariables pass, so the regcoalescer is aware of them (some SSA info is still alive but the re...

Hi, I don't know if my llvm ir code is faulty, or if I spot a bug in the RegisterCoalescing Pass, so I'm posting my issue on the ML. Shader and print-before-all dump are given below. The interessing part is the vreg6/vreg48 reduction : before RegCoalescing, the machine code is : // BEFORE LOOP ... Some COPYs.... 400B%vreg47<def> = COPY %vreg2<kill>; R600_Reg32:%vreg47,%vreg2