nickdesaulniers added a comment.
Playing around with `llvm-dwarfdump` today, I think I found an interesting
example:
Consider the following DWARF DIE:
0x00017e5e: DW_TAG_variable
DW_AT_location (0x00002144:
[0x00000000000007c4, 0x00000000000007c8):
DW_OP_reg8 W8
[0x00000000000007c8, 0x00000000000007d8):
DW_OP_breg31 WSP+48
[0x00000000000007d8, 0x00000000000007e8):
DW_OP_lit0, DW_OP_stack_value)
DW_AT_abstract_origin (0x00016776 "sp_el0")
How I read this: `sp_el0` is in `w8` while the program counter is from 0x7c4
until 0x7c8, at which point it's spilled to `wsp+48` until the program counter
reaches 0x7e8 at which point (this gets hazy, but
https://dwarfstd.org/ShowIssue.php?issue=100831.1 is worth a read) the value is
"rematerializable?"
Though I also see DW_AT_location attributes getting pretty crazy.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D135488/new/
https://reviews.llvm.org/D135488
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