[llvm-commits] [PATCH] ARM/NEON: Custom lower ctpop for appropriate vector types

[Pete Couperus]

Hello,

The population count intrinsic (ctpop) is supported on ARM/NEON for v8i8
and v16i8 types via NEON's vcnt instruction.
This patch leverages vcnt and other NEON instructions to custom lower ctpop
for v2i32/v4i32 and v4i16/v8i16 types.
As you'll see, a fair chunk of this patch is comments describing the
lowering, which I am happy to adjust to people's liking.
Please review!
Thanks!

Pete
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