Merge pull request #202 from eschnett/stevenrbrandt/loop-defaults #799

Job	Run time
download-build-test (cpu, real32, debug)	12m 46s
download-build-test (cpu, real64, debug)	14m 39s
download-build-test (cpu, real64, optimize)	22m 44s
download-build-test (cuda, real32, debug)	28m 23s
download-build-test (cuda, real64, debug)	32m 56s
download-build-test (cuda, real64, optimize)	27m 20s
download-build-test (rocm, real64, debug)	20m 8s
download-build-test (rocm, real64, optimize)	19m 27s
	2h 58m 23s

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