[PATCH] D43752: [RISCV] Preserve stack space for outgoing arguments when the function contain variable size objects

[Shiva Chen via Phabricator via llvm-commits]

shiva0217 created this revision.
shiva0217 added a reviewer: asb.
Herald added subscribers: kito-cheng, niosHD, sabuasal, apazos, jordy.potman.lists, simoncook, johnrusso, rbar.

When the function contains variable size objects:
E.g.

bar (int x)
{

  char p[x];
  
  push outgoing variables for foo.
  call foo

}

RISCVFrameLowering::hasFP() will return true.
Therefore, default hasReservedCallFrame will return false which means outgoing arguments stack space will not preserve.

We need to generate stack adjustment instructions for outgoing arguments by eliminateCallFramePseudoInstr when the function contains variable size objects.


Repository:
  rL LLVM

https://reviews.llvm.org/D43752

Files:
  lib/Target/RISCV/RISCVFrameLowering.cpp
  lib/Target/RISCV/RISCVFrameLowering.h
  test/CodeGen/RISCV/alloca.ll
  test/CodeGen/RISCV/calling-conv.ll
  test/CodeGen/RISCV/vararg.ll

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