[LLVMdev] replace hardcoded function names by intrinsics

[Jochen Wilhelmy]

Hi!

in the llvm code there are several places with hardcoded function names for
e.g. sin, sinf, sqrt, sqrtf etc., namely
ConstantFolding.cpp
InlineCost.cpp
SelectionDAGBuilder.cpp
IntrinsicLowering.cpp
TargetLowering.cpp

my question is: wouldn't it be beneficial to use intrinsics for this? 
for example a c/c++
frontend (clang) could translate the function calls to intrinsics and 
then in a very late
step (IntrinsicLowering.cpp?) translate it back to function calls.
an opencl frontend then could use the intrinsics on vector types and 
ConstantFolding.cpp
would work on sin/cos of vector types. currently the intrinsics for 
sin/cos are missing in
ConstantFolding.
To summarize, using only intrinsics would reduce complexity and increase 
flexibility as
vector types are supported.

-Jochen