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idxprom1
2017 May 21
4
Handling native i16 types in clang and opt
Hello.
My target architecture supports natively 16 bit integers (i16).
Whenever I write in C programs using only short types, clang compiles the program to
LLVM and converts the i16 data to i32 to perform arithmetic operations and then truncates
the results to i16. Then, the InstructionCombining (INSTCOMBINE or IC) pass removes these
conversions back and forth from i16, except for