I just got interested and did a test myself.  Comparing gcc 4.0 (-O2
-funroll-loops -D__NO_MATH_INLINES -ffast-math -march=pentium4
-mfpmath=sse -ftree-vectorize)
and icc 9.0 beta (-O3 -xW -ip):
                                  gcc 4.0     icc 9.0
Composite Score:          543.65    609.20
FFT             Mflops:   313.71       318.29
SOR             Mflops:   441.96      426.32
MonteCarlo:     Mflops:   105.68     71.20
Sparse matmult  Mflops:   574.88   891.65
LU              Mflops:  1282.00      1338.56

which looks not too bad ;)

Richard.

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