[LLVMdev] Documentation of bitcasts in calls (original) (raw)
Thomas Ströder stroeder at informatik.rwth-aachen.de
Mon Jul 13 04:46:41 PDT 2015
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Dear all,
I just stumbled over the following instruction in the LLVM IR of a C program compiled with clang:
%26 = call i32 (...)* bitcast (i32 (i32, i32, i32, i32, i32)* @KeWaitForSingleObject to i32 (...)*)(i32 %23, i32 %24, i32 %25, i32 0, i32 0)
Since our LLVM Parser choked on this instruction, I tried to check the documentation, but did not find anything about such nested bitcasts within calls. What is the exact syntax and semantics (while I can guess the latter, especially the former is interesting for me when building a parser for LLVM IR) for such instructions and/or where is this documented? In particular, the parantheses around the arguments of the bitcast are confusing me.
Alternatively, is there a way to tell clang not to inline such bitcasts, but have them in a separate instruction before and use the result in the call?
Best regards,
Thomas
-- Thomas Ströder mailto:stroeder at informatik.rwth-aachen.de LuFG Informatik 2 http://verify.rwth-aachen.de/stroeder RWTH Aachen phone: +49 241 80-21241
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