Simon Pilgrim 940061438e [InstCombine] Fold (mul(abs(x),abs(x))) -> (mul(x,x)) (PR39476)
This patch adds support for discarding integer absolutes (abs + nabs variants) from self-multiplications.

ABS Alive2: http://volta.cs.utah.edu:8080/z/rwcc8W
NABS Alive2: http://volta.cs.utah.edu:8080/z/jZXUwQ

This is an InstCombine version of D79304 - I'm not sure yet if we'll need that after this.

Reviewed By: @lebedev.ri and @xbolva00

Differential Revision: https://reviews.llvm.org/D79319
2020-05-04 15:21:52 +01:00
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