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...eat the purpose of using virtual registers in the first place. Unfortunately, there do not seem to be any documentation (or even existing back-ends) using this approach. For the stack slot approach, what exactly are the semantics of the foldMemoryOperandImpl method? And how does it relate to the storeRegToStackSlot and readRegFromStackSlot methods? Do the storeReg/readReg methods generate the (load/store) spill code and the foldMemoryOperandImpl method combine the generated loads/stores directly into the instructions that reference them? > /jakob > > __________________________________...

...What you are doing is very different from what a 'real' target requires, so you should probably try to figure out which passes make sense for a GPU back-end. > For the stack slot approach, what exactly are the semantics of the foldMemoryOperandImpl method? And how does it relate to the storeRegToStackSlot and readRegFromStackSlot methods? Do the storeReg/readReg methods generate the (load/store) spill code and the foldMemoryOperandImpl method combine the generated loads/stores directly into the instructions that reference them? When a register is spilled, the register allocator first tr...

On May 17, 2011, at 11:32 AM, Andrew Clinton wrote: > On 05/17/2011 12:54 PM, Jakob Stoklund Olesen wrote: >> What you can do instead is: >> >> 1) Just use virtual registers and skip register allocation, or >> >> 2) Allocate to a small register file, implement memory operand folding, and pretend that spill slots are registers. >> >> /jakob >>