search for: nonallocatable

...mplementation has DeadMachineInstructionElim pass enabled, which is causing havoc with my backend. Before entering this pass, everything in my machine function is fine, after this pass, all instructions that are not function calls are deleted. I've tracked this issue down to the line: BitVector NonAllocatableRegs = TRI->getAllocatableSet(MF); (In my case all registers defined in RegisterInfo.td) This function loops through all registers classes and sets all registers in the bitset that are allocatable. It then inverts the registers that are set to get the NonAllocatable registers and assigns that to...

...tation has DeadMachineInstructionElim pass enabled, which is causing havoc with my backend. Before entering this pass, everything in my machine function is fine, after this pass, all instructions that are not function calls are deleted. I’ve tracked this issue down to the line: > > BitVector NonAllocatableRegs = TRI->getAllocatableSet(MF); (In my case all registers defined in RegisterInfo.td) > > This function loops through all registers classes and sets all registers in the bitset that are allocatable. It then inverts the registers that are set to get the NonAllocatable registers and assig...

...space to the functions that are expected to be passed into the register. So it looks something like this: ... do some work ... Mov %r0, %r1025 Mov %r1, %r1026 Mov %r2, %r1027 Call someFunc %r0, %r1, %r2 <-- this func stores to memory Ret The moves to the physical registers are being deleted as NonAllocatableRegs is set to all one's and then inverted, and since these are deleted, every instruction that they depended on is also deleted. I have a workaround(disable the pass), but I'd much rather figure out what I am doing incorrectly that is causing this behavior or if determining if the default...

...space to the functions that are expected to be passed into the register. So it looks something like this: ... do some work ... Mov %r0, %r1025 Mov %r1, %r1026 Mov %r2, %r1027 Call someFunc %r0, %r1, %r2 <-- this func stores to memory Ret The moves to the physical registers are being deleted as NonAllocatableRegs is set to all one's and then inverted, and since these are deleted, every instruction that they depended on is also deleted. I have a workaround(disable the pass), but I'd much rather figure out what I am doing incorrectly that is causing this behavior or if determining if the default...