search for: vreg99

Hello. Could you please tell me how can I optimize with the back end (llc) the following piece of assembly code generated by llc: // NOTE: my processor accepts loops in the form of REPEAT(num_times)..END_REPEAT R0 = ... REPEAT(256) R5 = R0; // basically unnecessary reg. copy REPEAT(256) R10 = LS[R4]; R2 = LS[R5]; R4 =

...his case, but I don't think it can properly handle this in general. For example: 112B BB#1: derived from LLVM BB %for.body, ADDRESS TAKEN Predecessors according to CFG: BB#0 BB#1 %vreg12<def> = PHI %vreg13, <BB#1>, %vreg11, <BB#0>;CTRRC8:%vreg12,%vreg13,%vreg11 %vreg99<def> = PHI %vreg13, <BB#1>, %vreg2, <BB#0> %vreg13<def> = COPY %vreg12<kill>; CTRRC8:%vreg13,%vreg12 %vreg13<def> = BDNZ8 %vreg13, <BB#1>; CTRRC8:%vreg13 B <BB#2> Successors according to CFG: BB#2 BB#1 Since it is impossible to copy %vreg1...

Hello again, I am trying to implement an optimization pass for PowerPC such that simple loops use the special "counter register" (CTR) to track the induction variable. This is helpful because, in addition to reducing register pressure, there is a combined decrement-compare-and-branch instruction BZND (there are also other related instructions). I started this process by converting the

...think it can properly handle this in general. For example: > > 112B BB#1: derived from LLVM BB %for.body, ADDRESS TAKEN > Predecessors according to CFG: BB#0 BB#1 > %vreg12<def> = PHI %vreg13, <BB#1>, %vreg11, > <BB#0>;CTRRC8:%vreg12,%vreg13,%vreg11 %vreg99<def> = PHI %vreg13, > <BB#1>, %vreg2, <BB#0> %vreg13<def> = COPY %vreg12<kill>; > CTRRC8:%vreg13,%vreg12 %vreg13<def> = BDNZ8 %vreg13, <BB#1>; > CTRRC8:%vreg13 B <BB#2> > Successors according to CFG: BB#2 BB#1 > > Since i...