tree 6c61a20be8c66d0a57e9cbf602ab2e26fa5c36e1
parent b4be4da6e39726468cb63be7f16c8870feaae5f5
author Francis Visoiu Mistrih <francisvm@yahoo.com> 1546955595 +0000
committer Francis Visoiu Mistrih <francisvm@yahoo.com> 1546955595 +0000

[X86][Darwin] Emit compact-unwind for register-sized stack adjustments

For stack frames on the size of a register in x86, a code size optimization
emits "push rax/eax" instead of "sub" for stack allocation. For example:

foo:
  .cfi_startproc
BB#0:
  pushq %rax
Ltmp0:
  .cfi_def_cfa_offset 16
  ...
  .cfi_endproc

However, we are falling back to DWARF in this case because we cannot
encode %rax as a saved register.

This requirement is wrong, since we don't care about the contents of
%rax, it is the equivalent of a sub.

In order to specify that we care about the contents of %rax, we would
need a .cfi_offset %rax, <offset>.

It's also overzealous in the case where there are pushes for callee saved
registers followed by a "push rax/eax" instead of "sub", in which case we should
also be able to encode the callee saved regs and everything else using compact
unwind.

Patch authored by Bruno Cardoso Lopes.

Differential Revision: https://reviews.llvm.org/D13793

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350623 91177308-0d34-0410-b5e6-96231b3b80d8