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2014 Mar 04
9
[LLVMdev] Upstreaming PNaCl's IR simplification passes
...scalars, removing the "insertvalue" and "extractvalue" instructions. * PromoteIntegers legalizes integer types (e.g. i30 is converted to i32). * Module-level lowering: This implements, at the IR level, functionality that is traditionally provided by "ld". e.g. ExpandCtors lowers llvm.global_ctors to the __init_array_start and __init_array_end symbols that are used by C libraries at startup. PNaCl's IR simplification passes are modular -- most are independent of each other -- so they allow projects to pick and choose which IR features to support and which to pr...
2014 Mar 05
2
[LLVMdev] A "backend" is ... ?
...on currently used in the backends. ...all of which clearly presume multiple backends exist; and yet I then see this: >>>> * Module-level lowering:  This implements, at the IR level, >>>> functionality that is traditionally provided by "ld".  e.g. >>>> ExpandCtors lowers llvm.global_ctors to the __init_array_start >>>> and __init_array_end symbols that are used by C libraries at >>>> startup. >>> >>> This doesn't make any sense to me. The IR representation is >>> strictly simpler. It is trivially lowere...
2014 Mar 05
4
[LLVMdev] Upstreaming PNaCl's IR simplification passes
...nd, but I don't think we should develop such a framework > independently of the legalization currently used in the backends. > > >> >> * Module-level lowering: This implements, at the IR level, >> functionality that is traditionally provided by "ld". e.g. ExpandCtors >> lowers llvm.global_ctors to the __init_array_start and __init_array_end >> symbols that are used by C libraries at startup. >> > > This doesn't make any sense to me. The IR representation is strictly > simpler. It is trivially lowered in a backend. I don't und...