C compile time

[Dara Hazeghi]

Okay, here's the updated table. Checking is disabled
on all compilers.

gcc version     -O0     -O1     -O2     -O3
2.7.2.3         128.04  131.02  163.51  176.01
2.8.1           128.86  140.79  182.35  194.63
2.90.29         130.60  140.57  186.29  199.32
2.91.66         132.44  148.48  203.71  219.21
2.95.3          143.38  180.97  250.94  276.85
3.0.4           169.79  210.73  320.24  365.15
3.2.3           193.48  269.43  424.74  519.85
3.3             184.15  282.57  442.64  529.93
3.3-branch      184.15  283.89  443.66  535.10
3.4-mainline    195.34  302.02  483.84  704.59
3.4-mainline*   175.84  269.78  426.77  627.13
3.5-tree-ssa    223.33  327.91  503.58  702.11 

*this includes Andrew Pinki's patch for PR10962

icc* version    -O0     -O1*    -O2     -O3*
5.01*           158.47  ~       293.47  293.11
6.0             142.81  ~       227.25  227.88
7.1             153.95  ~       243.35  243.78

*icc is Intel's C++ Compiler for Linux (unsupported
noncommerical version)
*icc sets -O1 and -O2 to be the same
*icc claims -O2 and -O3 are different, but I'm not
sure how, as compile time indicates
*icc 5.0 would not compile df.c, so df.c was compiled
with gcc for this test

Dara

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