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0.3822
2012 Jul 06
2
[LLVMdev] Excessive register spilling in large automatically generated functions, such as is found in FFTW
Hi,
I've noticed that LLVM tends to generate suboptimal code and spill an
excessive amount of registers in large functions, such as in those
that are automatically generated by FFTW.
LLVM generates good code for a function that computes an 8-point
complex FFT, but from 16-point upwards, icc or gcc generates much
better code. Here is an example of a sequence of instructions from a
32-point