D.gnu - [Bug 228] New: Creation of temporaries internally needs to be taken
- via D.gnu (34/34) Jun 06 2016 http://bugzilla.gdcproject.org/show_bug.cgi?id=228
http://bugzilla.gdcproject.org/show_bug.cgi?id=228 Bug ID: 228 Summary: Creation of temporaries internally needs to be taken back under control. Product: GDC Version: development Hardware: All OS: All Status: NEW Severity: normal Priority: Normal Component: gdc Assignee: ibuclaw gdcproject.org Reporter: ibuclaw gdcproject.org See, for instance: https://github.com/D-Programming-GDC/GDC/pull/217 Though the use of COMPOUND_EXPR seems to make the matter look worse, it should be investigated why we create so many temporaries (SAVE_EXPRs). Having a single pass after generating the code is not ideal. If it is indeed simply COMPOUND_EXPRs with side effects, then we should make all codegen helpers COMPOUND_EXPR-aware. e.g: build_deref(build_nop(type, build_address(expr))); Should not result in: *((TYPE *)&(foo(), bar)); Instead always apply the action to the right-most result. (foo(), *(TYPE *)&bar); This should simplify inspecting expressions in order-sensitive parts, where the question "Do we need a temporary?" in maybe_make_temp could three possible answers - Yes; No; and No, but the left hand side (normally construction) needs to be executed first. Creating temporaries at every step also blocks bug42. -- You are receiving this mail because: You are watching all bug changes.
Jun 06 2016