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Attempted fix for T40363: CUDA 30% slowdown in testbuilds compared to 2.70.

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CMake had this --fast-math flag but scons not, makes a big difference on some
files. Slightly slower rendering might still happen though, but it should not
be this much.
This commit is contained in:
Brecht Van Lommel 2014-05-26 16:48:30 +02:00
parent 033b4ffddd
commit b33d83bf51
1 changed files with 1 additions and 1 deletions
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intern/cycles/kernel/SConscript
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@ -74,7 +74,7 @@ if env['WITH_BF_CYCLES_CUDA_BINARIES']:
# nvcc flags
nvcc_flags = "-m%s" % (bits)
nvcc_flags += " --cubin --ptxas-options=\"-v\""
nvcc_flags += " --cubin --ptxas-options=\"-v\" --use_fast_math"
nvcc_flags += " -D__KERNEL_CUDA_VERSION__=%d" % (cuda_version)
nvcc_flags += " -DCCL_NAMESPACE_BEGIN= -DCCL_NAMESPACE_END= -DNVCC"
nvcc_flags += " -I \"%s\" -I \"%s\" -I \"%s\" -I \"%s\"" % (util_dir, svm_dir, geom_dir, closure_dir)