C API header xcvalu #95
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This commit adds the C API header to serve as an interface for the intrinsic functions provided with the CORE-V xcvalu extension. The commit includes the addition of the header itself and a clang CodeGen test that checks the integrity of the call to the wrapper functions designed in the C API CORE-V alu header.
This patch removes a redundant comparison of an unsigned value as greater or equal to zero from code written for the CV ALU LLVM instrinsics. This redundant comparison caused a warning when building LLVM.
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This patch adds the C API header file for the xcvalu 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.
Finally the patch adds the cmake support for the header file. This needs to follow the analogous patch for the xcvbitmanip builtins as that one includes the basic cmake support to add all the headers.