forked from OSchip/llvm-project
b9c26a9cfe
Summary: The previous version relied on the standard calling convention using std::reverse() to try to force the AVR ABI. But this only works for simple cases, it fails for example with aggregate types. This patch rewrites the calling convention with custom C++ code, that implements the ABI defined in https://gcc.gnu.org/wiki/avr-gcc. To do that it adds a few 16-bit pseudo registers for unaligned argument passing, such as R24R23. For example this function: define void @fun({ i8, i16 } %a) will pass %a.0 in R22 and %a.1 in R24R23. There are no instructions that can use these pseudo registers, so a new register class, DREGSMOVW, is defined to make them apart. Also the ArgCC_AVR_BUILTIN_DIV is no longer necessary, as it is identical to the C++ behavior (actually the clobber list is more strict for __div* functions, but that is currently unimplemented). Reviewers: dylanmckay Subscribers: Gaelan, Sh4rK, indirect, jwagen, efriedma, dsprenkels, hiraditya, Jim, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68524 Patch by Rodrigo Rivas Costa. |
||
|---|---|---|
| .. | ||
| AsmParser | ||
| Disassembler | ||
| MCTargetDesc | ||
| TargetInfo | ||
| AVR.h | ||
| AVR.td | ||
| AVRAsmPrinter.cpp | ||
| AVRCallingConv.td | ||
| AVRDevices.td | ||
| AVRExpandPseudoInsts.cpp | ||
| AVRFrameLowering.cpp | ||
| AVRFrameLowering.h | ||
| AVRISelDAGToDAG.cpp | ||
| AVRISelLowering.cpp | ||
| AVRISelLowering.h | ||
| AVRInstrFormats.td | ||
| AVRInstrInfo.cpp | ||
| AVRInstrInfo.h | ||
| AVRInstrInfo.td | ||
| AVRMCInstLower.cpp | ||
| AVRMCInstLower.h | ||
| AVRMachineFunctionInfo.h | ||
| AVRRegisterInfo.cpp | ||
| AVRRegisterInfo.h | ||
| AVRRegisterInfo.td | ||
| AVRRelaxMemOperations.cpp | ||
| AVRSelectionDAGInfo.h | ||
| AVRSubtarget.cpp | ||
| AVRSubtarget.h | ||
| AVRTargetMachine.cpp | ||
| AVRTargetMachine.h | ||
| AVRTargetObjectFile.cpp | ||
| AVRTargetObjectFile.h | ||
| CMakeLists.txt | ||
| LLVMBuild.txt | ||
| README.md | ||
| TODO.md | ||