150454 2015-10-22 11:02:03 -0700 Air needs to know which subset of an argument an operation will use or def 2016-01-26 21:58:57 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build All All RESOLVED FIXED P2 Normal --- 150279 1 fpizlo webkit-unassigned oldest_to_newest 1135738 0 fpizlo 2015-10-22 11:02:03 -0700 That would allow us to spill it more compactly and emit tighter code in general. It would also be cool if Def32 could be made to clearly imply that the high bits are zero'd, since that would allow us to eliminate more zero extensions from the code. 1159208 1 fpizlo 2016-01-26 21:58:57 -0800 We fixed this already.