[PATCH] D46232: [SystemZ, IPRA] determineCalleeSaves must always add return register and DP.

[Vivek Pandya via Phabricator via llvm-commits]

vivekvpandya added a comment.

In https://reviews.llvm.org/D46232#1083113, @uweigand wrote:

> But we do not want to force use of a frame pointer, in general this just reduces performance for no reason on Z.   Some functions require a frame pointer (those that do dynamic allocas), but most do not.


Then I think code should be modified in following manner:

  if (HasFP || MRI.isPhysRegModified(SystemZ::R11D) )
    SavedRegs.set(SystemZ::R11D);


https://reviews.llvm.org/D46232