Duncan P. N. Exon Smith 0b73d71abb AsmPrinter: Compute absolute label difference directly ... Create a low-overhead path for `EmitLabelDifference()` that emits a emits an absolute number when (1) the output is an object stream and (2) the two symbols are in the same data fragment. This drops memory usage on Mach-O from 975 MB down to 919 MB (5.8%). The only call is when `!doesDwarfUseRelocationsAcrossSections()` -- i.e., on Mach-O -- since otherwise an absolute offset from the start of the section needs a relocation. (`EmitLabelDifference()` is cheaper on ELF anyway, since it creates 1 fewer temp symbol, and it gets called far less often. It's not clear to me if this is even a bottleneck there.) (I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`; see r236629 for details.) llvm-svn: 237876		2015-05-21 02:41:23 +00:00
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llvm	AsmPrinter: Compute absolute label difference directly	2015-05-21 02:41:23 +00:00
llvm-c	LTO: Add API to choose whether to embed uselists	2015-04-27 23:38:54 +00:00