[all-commits] [llvm/llvm-project] c5f348: [LLVM] [MC] Update frame layout & CFI generation t...

[Wesley Wiser via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: c5f34876cd00c01bf5ecd38a2bfc5377867e4b04
      https://github.com/llvm/llvm-project/commit/c5f34876cd00c01bf5ecd38a2bfc5377867e4b04
  Author: Wesley Wiser <wwiser at gmail.com>
  Date:   2024-07-26 (Fri, 26 Jul 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/MachineFrameInfo.h
    M llvm/include/llvm/CodeGen/TargetFrameLowering.h
    M llvm/include/llvm/MC/MCAsmBackend.h
    M llvm/include/llvm/MC/MCDwarf.h
    M llvm/lib/CodeGen/CFIInstrInserter.cpp
    M llvm/lib/CodeGen/MachineFrameInfo.cpp
    M llvm/lib/CodeGen/PrologEpilogInserter.cpp
    M llvm/lib/MC/MCDwarf.cpp
    M llvm/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
    M llvm/lib/Target/ARM/ARMFrameLowering.cpp
    M llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
    M llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackendDarwin.h
    M llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
    M llvm/lib/Target/MSP430/MSP430FrameLowering.cpp
    M llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
    M llvm/lib/Target/X86/X86FrameLowering.cpp
    M llvm/test/CodeGen/PowerPC/huge-frame-size.ll
    M llvm/test/CodeGen/RISCV/pr88365.ll
    M llvm/test/CodeGen/X86/huge-stack.ll

  Log Message:
  -----------
  [LLVM] [MC] Update frame layout & CFI generation to handle frames larger than 2gb (#99263)

Rebase of #84114. I've only included the core changes to frame layout
calculation & CFI generation which sidesteps the regressions found after
merging #84114. Since these changes are a necessary precursor to the
overall fix and are themselves slightly beneficial as CFI is now
generated correctly, I think it is reasonable to merge this first step.

---

For very large stack frames, the offset from the stack pointer to a
local can be more than 2^31 which overflows various `int` offsets in the
frame lowering code.

This patch updates the frame lowering code to calculate the offsets as
64-bit values and fixes CFI to use the corrected sizes.

After this patch, additional work is needed to fix offset truncations in
each target's codegen.

(cherry picked from commit ca076f7a63f6a80e2e38315ec462be354b196b8d)



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