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* [driver] Test that last option wins between -Ofast and -O2.Chad Rosier2013-04-241-0/+8
| | | | | | Part of rdar://13622687 llvm-svn: 180207
* [driver] Put -fvectorize under the -Ofast umbrella flag.Chad Rosier2013-04-241-0/+11
| | | | | | Part of rdar://13622687 llvm-svn: 180206
* [driver] Improve the implementation of the -Ofast option.Chad Rosier2013-04-241-0/+20
Specifically, allow the flags that fall under this umbrella (i.e., -O3, -ffast-math, and -fstrict-aliasing) to be overridden/disabled with the individual -O[0|1|2|s|z]/-fno- flags. This also fixes the handling of various floating point optimization flags that are modified by -ffast-math (and thus -Ofast as well). Part of rdar://13622687 llvm-svn: 180204
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