C API header xcvbitmanip and type fixes #97
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PaoloS02
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This patch fixes the types of arguments and return value of the bitmanip CORE-V Clang builtins extract, ff1, fl1, clb and cnt so that they follow the spec.
This commit adds the C API header to serve as an interface for the intrinsic functions provided with the CORE-V xcvbitmanip extension. The commit includes the addition of the header itself, the update of cmake to support this header file and more to follow from RISC-V and a clang CodeGen test that checks the integrity of the call to the wrapper functions designed in the C API CORE-V bitmanip header.
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This patch adds the C API header file for the xcvbitmanip Clang builtins.
It also adds the CodeGen test that checks that the wrapper functions defined in the header turn into the right LLVM instrinsic when called.
The patch also adds a fix for the types of the operands of some bitmanip builtins that were wrongly declared as signed instead of unsigned or as not constant arguments.
Finally the patch adds the basic cmake support for the CORE-V C API header files and adds the xcvbitmanip header file to the cmake list.
The other C API header patches need to follow this.