[LLVMdev] vectorize a def-use chain (original) (raw)

Frank Winter fwinter at jlab.org
Wed Jul 8 15🔞03 PDT 2015

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I'd like to replace scalar instructions with vector instructions such that the code corresponding to following tree would be vectorized:

load0 load1 \ / \ / add/sub/mul | | store

I had unsuccessful encounters with load0->replaceAllUsesWith(vec_load0) complaining about mismatching type (makes sense, add's other operand is still scalar at that time..)

Is the only way to create a vectorized version of this tree by

1. creating the vector loads vec_load0 AND vec_load1
2. retrieving the opcode of the arithmetic instruction and create a new one according to the opcode

How is step 2) in donepractice? Cloning the instruction and replacing the operands? (would that bypass the type checking for a moment?)

Thanks, Frank

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