[LLVMdev] sincos functions (original) (raw)

Duncan Sands baldrick at free.fr
Thu Sep 15 05:29:19 PDT 2011

Hi Suresh,

I was trying to compare the performance of icc, gcc and llvm on the program almabench.c in Coyote Benchmark suite. Here is a line of code from the program.

da = da + (ca[np][k] * cos(arga) + sa[np][k] * sin(arga)) * 0.0000001; gcc and icc are performing way better than llvm as they are using 'sincos' library function to compute the sin and the cos of the argument in a single shot. However llvm is computing sin and cos seperately. Is there any compiler option which can enable the code generator to use 'sincos' function against 'sin' and 'cos' functions seperately.

no, it hasn't been implemented in LLVM yet. Please open a bugreport if this optimization is important for you.

Ciao, Duncan.

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