search for: skipcond

But in the first version it's used on the next row: %reg16388<def> = CMPrr %reg16384, %reg16385, %CFR<imp-def,dead>; IntRegs:%reg16388,16384,16385 SKIPCOND 1, *%CFR<imp-use>* Or doesn't that count? Following are patters for cmp and skipcond: def cmpcc : SDNode<"CSISD::CMP", SDTIntBinOp, [SDNPOutFlag]>; let Defs = [CFR] in { def CMPrr : InstCS<(outs IntRegs:$dst), (ins IntRegs:$b, IntRegs:$c), "c...

It just occured to me that perhaps what happens is that since the cmp-instruction is initially followed by the pseudo-instruction - which doesn't have Uses = [CFR] - that it's marked dead initially, and never changed back when the SKIPCOND is inserted by the custom emitter? But I feel that this would happen in e.g. MSP430 too then... On Wed, Dec 15, 2010 at 10:14 AM, Anton Korobeynikov < anton at korobeynikov.info> wrote: > Hello Per, > > > SKIPCOND 1, %CFR<imp-use> > > Or doesn't that count?...

...16385<def> = COPY %R1; IntRegs:%reg16385 %reg16384<def> = COPY %R0; IntRegs:%reg16384 %reg16390<def> = MOVE %reg16386; IntRegs:%reg16390,16386 %reg16388<def> = CMPrr %reg16384, %reg16385, %CFR<imp-def,dead>; IntRegs:%reg16388,16384,16385 SKIPCOND 1, %CFR<imp-use> Successors according to CFG: BB#2 BB#1 BB#1: derived from LLVM BB %entry Predecessors according to CFG: BB#0 %reg16391<def> = MOVE %reg16387; IntRegs:%reg16391,16387 Successors according to CFG: BB#2 BB#2: derived from LLVM BB %entry Predecesso...

Hello Per, > The CMPrr instruction is moved down to after the PHI node. My guess is that > the 'dead' in CFR<imp-def,dead> is to blame, but I can't see what I'm doing > differently from MSP430/sparc that makes this not work. Any help GREATLY > appreciated! It seems like no use of CFR after CMP, indeed. How condbranches on your platform look like (patterns, etc.)

Hello Per, >      SKIPCOND 1, %CFR<imp-use> > Or doesn't that count? Ah, sorry, I didn't recognize the stuff due to funky name. Let me think on the issue more thoroughly then :) -- With best regards, Anton Korobeynikov Faculty of Mathematics and Mechanics, Saint Petersburg State University