[PATCH] D133300: [InstCombine] Matrix multiplication negation optimisation

[Jim Radford via Phabricator via llvm-commits]

radford added a comment.

In D133300#3771911 <https://reviews.llvm.org/D133300#3771911>, @thegameg wrote:

> Are we looking to also support `-(A * B) -> -A * B` with the negation on the cheapest operand? (might need to check what the required fast math flags are)

We should.  In particular, there three places for the negation to go: `-A * B = A * -B = -(A * B)` and any one of the three might be smaller.


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