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The commit r369122 may keep LR and FP register (aka. frame record) in the middle of a frame, thus we must add the offsets to ensure the FP register always points to innermost frame record on the stack. According to AAPCS64[1], a conforming code shall construct a linked list of stack frames that can be traversed with frame records. This commit is also essential to frame-pointer-based stack unwinder (e.g. the stack unwinder in linx-perf-tools.) [1] https://github.com/ARM-software/software-standards/blob/master/abi/aapcs64/aapcs64.rst#the-frame-pointer Test: llvm-lit ${LLVM_SRC}/test/CodeGen/AArch64/framelayout-frame-record.ll Test: llvm-lit ${LLVM_SRC}/test/CodeGen/AArch64 Differential Revision: https://reviews.llvm.org/D70800 |
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