[LLVMdev] llvm-gcc-4.2 vs gcc 4.4

[Chris Lattner]

On Jan 22, 2009, at 9:48 PM, Jack Howarth wrote:

> In order to see how llvm-gcc-4.2 svn performs in code generation
> compared to the upcoming gcc 4.4, I ran the Polyhedron 2005
> benchmarks on a MacPro with the -ffast-math -funroll-loops -msse3 -O3
> optimization flags for both compilers. The results are summarized
> below.

Hi Jack,

Out of curiousity, how does llvm-gcc 4.2 compare against gcc 4.2?  I  
know that a lot of improvement went into the fortran frontend and  
runtime library between 4.2 -> 4.4, and it would be nice to isolate  
effects of just the optimizer/backend.

-Chris

>
>
>              Ave Run (secs)      Ave Run (secs)     llvm-gcc-4.2/
> Benchmark     llvm-gcc-4.2 svn    gcc trunk          gcc trunk
> ac            15.01               12.65              1.187
> aermod        15.96               25.52              0.625
> air           8.25                7.10               1.162
> capaccita     51.41               49.56              1.037
> channel       3.32                1.81               1.834
> doduc         34.06               35.28              0.965
> fatigue       12.80               10.13              1.264
> gas_dyn       16.45               7.63               2.156
> induct        26.70               14.88              1.794
> linpk         15.40               15.50              0.994
> mdbx          14.19               12.36              1.148
> nf            29.01               25.50              1.138
> protein       45.03               39.12              1.151
> rnflow        39.67               30.68              1.293
> test_fpu      14.03               10.50              1.336
> tfft          2.19                2.08               1.053
>
>
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