[LLVMdev] What may I assume about MachineFunctions.

Jeff Kunkel
Mon, 30 Aug 2010 11:37:54 -0000

Upon writing my register allocation algorithm, I am concerned that a load
may be skipped due to a branch.

For instance consider the psudocode

int x = 1
...
if( false )
  load x
  y = 3*x
else
  y = 4*x
...

The load happens in the false block because this is when the variable is
first seen. The load is not preformed in the else block because the register
allocator may see it loaded already.

Do I need to be concerned about cases like this?

Thanks,
Jeff Kunkel
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