T32 C libraries
There are several variations of the T32 libraries. It depends on the architecture target or processor as to which one is used.
ARMv7-A and ARMv7-R use a T32 library. It contains a small number of A32 instructions that are used to significantly improve performance.
ARMv7-M, ARMv7E-M, and ARMv8-M.mainline have their own T32 library.
ARMv6-M and ARMv8-M.baseline have their own T32 library.