version of clamped vector load from nick-sandbox
updated clamped vector load code to use IR node make methods
test code for clamped vector load, for posterity
removing test app
Merge branch 'master' into clamped-vector-load
removed print statements and added a few comments to clamped vector load
removed environment variable check
Fix printf() format string (one format string short).
Merge pull request #89 from mmp/fixwarn

Fix printf() format string (one format string short).
Fix up namespace usage to allow compiling in environments which
globally define names also used in std.
Choose number of worker threads based on # of CPUs present if HL_NUMTHREADS isn't defined.
Merge branch 'master' of git://github.com/halide/Halide into threads-cores
Merge pull request #91 from mmp/threads-cores

    Choose number of worker threads based on # of CPUs present if HL_NUMTHREADS isn't defined.
Add a missing WITH_PTX conditionalization. Prevents build error with
llvm that supports PTX, but where it is not enabled in Halide.
Vectorizable pow, exp, and log.
Merge branch 'master' of github.com:halide/Halide
Squashed HL_NUMTHREADS warning now that the default is sane.
You can finally cast Images to Arguments.

Previously you had to go via buffers, which was annoying.
log, exp, and pow handle constants more gracefully
fast_pow now casts non-floats to floats