For below java code:

(s[0] & 0xf) << 3; // s[0] can be any primitive type.

AArch64 OpenJDK c2 compiler generates:

and w11, w10, #0xf
lsl w0, w11, #3

It can be improved to generate (gcc does):

ubfiz w0, w0, #3, #4

Daniel Stewart will contribute a patch for this.