[LLVMdev] The creation of Neon Instruction

[Hanbing Li]

Dear all, 

I am trying to study the Loop Vectorization. Neon supports the vectorization, so I want to get the neon instructions. 
I tried to use the following command: 


clang -fomit-frame-pointer -ggdb -emit-llvm hello.c -c -arch arm -o hello.bc 

opt -mem2reg -loop-rotate -loop-simplify -lcssa -loop-vectorize -force-vector-width=8 hello.bc -o new.bc 

llc new . bc -march=arm -mattr=+neon -relocation-model=static -o new.s 
But I didn't get the neon instructions like "vadd, vmul" in the new.s. Is there anything wrong with the command? 
(clang3.4 on Mac OS X 10.9) 

Looking forward to your answers. 

Thank you! 

Hanbing LI 








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