[PATCH] D48444: [X86] Insure split-stack prolog check is retained for sibling calls

[Than McIntosh via Phabricator via llvm-commits]

thanm created this revision.
Herald added subscribers: llvm-commits, srhines.
Herald added a reviewer: javed.absar.

If a routine with no stack frame makes a sibling call, we need to
preserve the stack space check even if the local stack frame is empty,
since the call target could be a "no-split" function (in which case
the linker needs to be able to fix up the prolog sequence in order to
switch to a larger stack).

This fixes PR37807.


Repository:
  rL LLVM

https://reviews.llvm.org/D48444

Files:
  lib/Target/ARM/ARMFrameLowering.cpp
  lib/Target/X86/X86FrameLowering.cpp
  test/CodeGen/ARM/segmented-stacks.ll
  test/CodeGen/X86/segmented-stacks.ll

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