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Hello everybody, hi Evan, this patch changes the lowering of arguments for tail call optimized calls. Before arguments that could be overwritten by each other were explicitly lowered to a stack slot, not giving the register allocator a chance to optimize. Now a sequence of copyto/copyfrom virtual registers ensures that arguments are loaded in (virtual) registers before they are lowered to the

...lution, at least conceptually. SlotSize really is an unsigned quantity, and though it's unlikely we'd like 0x80000000 to be interpreted as positive, rather than negative if it ever does occur. Also, CreateFixedObject seems to take an int64_t I'd suggest: + ISelLowering line 2459: cast FPDiff to int64_t. + ISelLowering line 3327: cast SlotSize to int64_t. + FrameLowering: declare TailCallReturnAddrDelta as int64_t and subtract SlotSize? It would also be really good if you could convert your IR into a test-case (like the others in "test/CodeGen/X86/"). We like to have a test-c...

Dear LLVM developers, I am a developer of SML#, an ML-style functional programming language developed at Tohoku University. Currently we are intending to use LLVM as the backend of our SML# compiler in our upcoming release, and have rewritten our frontend and runtime so that they can cooperate with LLVM. LLVM works extremely fine with our SML# compiler. We are grateful to LLVM community for