I try do compile my opencl kernel to llvm IR.
With the following instruction
/home/mypass/llvm/Debug+Asserts/bin/clang -I/home/ian031545/libclc/generic/include -include clc/clc.h -Dcl_clang_storage_class_specifiers -target nvptx--nvidiacl -Xclang -mlink-bitcode-file -Xclang /ian031545/libclc/nvptx--nvidiacl/lib/builtins.bc -S -emit-llvm kernel.cl -o kernel.ll
The opencl kernel's structure look like this
__kernel(){
if() x[i]=a+b+1
else x[i]=a+b+2
}
And the llvm IR after using the instruction above look like this
entry: // it perform a+b here , we say c
then part: // it perform c+1
else part: // it perform c+2
Does anyone know why does clang do this kind of optimization here ? ( we say it frontend )
Or it may not be a kind of optimization ?
I don't know why clang do this here , for what purpose ?
Can i ask clang not to do this by adding flag to the instruction above ?
Thanks in advance
