search for: __xx_acos

...c so have to rely on a runtime library helper function (e.g., the stuff in compiler-rt/lib/builtins/). So, #1 and #2 would make LLVM able to emit calls to __xxx_acos when it sees "@llvm.acos.f32", but it won't let LLVM optimize (constant fold, transform into the intrinsic, ...) "__xx_acos()" when it sees it. It sounds like you also want to recognize and optimize these calls. That involves (pre-CodeGen) IR-level optimizations. No, I don't think that's supported today without changing LLVM (see the list in my first email). > 3) change TargetLibraryInfo for functions...

...> >> >> >> >> >> So, #1 and #2 would make LLVM able to emit calls to __xxx_acos when >> >> >> it sees "@llvm.acos.f32", but it won't let LLVM optimize (constant >> >> >> fold, transform into the intrinsic, ...) "__xx_acos()" when it sees >> >> >> it. >> >> >> >> >> >> It sounds like you also want to recognize and optimize these calls. >> >> >> That involves (pre-CodeGen) IR-level optimizations. >> >> >> No, I don't thi...

Tim, Are you referring to setLibcallName? That is target specific yes but there isn't RTLIB for most of the libm functions, for example, for acos this doesn't apply. Ideally what I would like is to create a libc with functions like acos called something like __xxx_acos that can still be recognized to be optimized. RTLIB is pretty limited but it works fine, I can just use