David Green 4ea1b43527 [AArch64] Generate ADDP from shuffled add ...

This adds a fold of add(x, shuffle(x, <1,0,3,2,5,4,...>), into
shuffle(addp(x), <0,0,1,1,2,2,..>. The ADDP instruction takes two
vectors and returns one, adding adjacent pairs. So we match x in a
custom combine as it is lowered from a v8i32. The original code
would be 2 rev64 and 2 add, with the new code being a single addp
with a zip1;zip2 shuffle, producing smaller code.

Differential Revision: https://reviews.llvm.org/D126686

2022-06-06 11:39:51 +01:00

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