[llvm] [AArch64] Fold vector select with power-of-2 bit-test to CMTST+BSP (PR #209100)

[Mugundan S via llvm-commits]

MGN-GIT wrote:

Hi @davemgreen,

I tried updating the test using the update test script. Currently, the GI instruction selection framework is still generating the AND+CMPEQ sequence, since our optimization only applies to the SD framework.

I’m not very familiar with GI yet. Would it be possible to add the corresponding optimization for GI separately at a separate PR? 

Thanks

https://github.com/llvm/llvm-project/pull/209100