[LLVMdev] llvm-gcc-4.2 vs gcc 4.4

[Jack Howarth]

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.

              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