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Xtensa patches (17.x) (Do not merge, PR created for easier review only) #86
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Initial codegen support for simple ALU operations.
Constant Pool.
operations. Lower ConstantPool, GlobalAddress, BlockAddress and JumpTable. Implement lowering of External and JumpTable symbols to MCInst representation.
Implement lowering of dynamic_stackalloc, stacksave, stackrestore.
Also lower SHL, SRA, SRL with register operands.
patterns. Implement load unsigned 8-bit pseudo operation. Implement extending loads patterns extloadi1/i8/i16.
Add support for llvm.{frameaddress,returnaddress} intrinsics.
Implement volatile load/store from/to volatile memory location.
scavenger. Reserve an emergency spill slot for the register scavenger when Windowed Call ABI is used.
Also implement User Registers class.
SELECT_CC/SETCC/BR_CC. Implement DAG Combine for BRCOND operation with f32 operands.
This option is passed to GNU AS and makes Xtensa compiler driver compatible with GCC.
Intrinsics: __builtin_xtensa_ae_int32x2 and builtin_xtensa_int32 are convenience functions for easy integer-vector and vector-vector conversions that conform to Xtensa coding style. Xtensa C dialect allows for implicit conversion between wider and narrower vector (via shuffle) and between integer and any vector (via broadcast). Standard Clang vectors do not support this, so these functions provide a handicap for better portability.
…attribute__((near))`
Fix disassembling of the Imm8_sh8, Imm64n_4n, Offset8m32, Entry_Imm12 immedaite operands.
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