llvm dev - Jul 2012 - [LLVMdev] Inneffiecient code produced by reg2mem?

Is there a pass I can use after reg2mem to get rid of occurances like this?:

  store i32 %cond, i32* %cond.reg2mem
  %cond.reload = load i32* %cond.reg2mem
  store i32 %cond.reload, i32* %cond4.reg2mem

Essentially, in this case, reg2mem creates an extra memory space to store
and load a value from just here, and never uses the value again; since this
isn't efficient code, I'm wondering if there's another pass I can
use to
fix the innefficient code reg2mem produces, or if my translator should do
it's own PHI elimination?
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Why are you running reg2mem if you want efficient code?

--Owen 

On Jul 25, 2012, at 1:28 PM, ryan baird <ryanrbaird at gmail.com> wrote:
> Is there a pass I can use after reg2mem to get rid of occurances like
this?:
> 
>   store i32 %cond, i32* %cond.reg2mem
>   %cond.reload = load i32* %cond.reg2mem
>   store i32 %cond.reload, i32* %cond4.reg2mem
> 
> Essentially, in this case, reg2mem creates an extra memory space to store
and load a value from just here, and never uses the value again; since this
isn't efficient code, I'm wondering if there's another pass I can
use to fix the innefficient code reg2mem produces, or if my translator should do
it's own PHI elimination?
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