Sanjay Patel 0e15de2d0c [InstCombine] fold reassociative FP add into start value of fadd reduction ...

This pattern is visible in unrolled and vectorized loops.
Although the backend seems to be able to reassociate to
ideal form in the examples I looked at, we might as well
do that in IR for efficiency.

2021-07-18 06:26:20 -04:00

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