scala - The Scala programming language

	Commit message (Collapse)	Author	Age	Files	Lines
*	Cleanup of constant optimization	James Iry	2013-03-14	1	-0/+3
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	This commit cleans up constant optimization from the review of https://github.com/scala/scala/pull/2214 . * drops are done using the instruction's consumed count rather than a numeric literal * drops are moved into one common method in the main instruction interpreter * One instance of x.length > y.length is replaced with x.lengthCompare(y.length) > 0 * NaN is dealt with by treating it as an UNKNOWN * A test is added to make sure NaN semantics aren't broken. * The constant-optmization test is improved with tests for switch statements
*	Analyze constants to remove unnecessary branches	James Iry	2013-03-07	1	-0/+2
	This commit adds analysis and optimization of constants to remove unnecessary branches. It uses abstract interpretation to determine what constant(s) a particular stack slot or variable might or might not hold at a given spot and uses that knowledge to eliminate branches that cannot be taken. Its primary goal is null check removal, but it also works for other constants. Several tests are modified to include the new optimization phase. Two new tests are added. One verifies that branching still works as expected. The other verifies that branches are removed.