[PATCH] D79141: [RISCV] Better Split Stack Pointer Adjustment for RVC

[Sam Elliott via Phabricator via llvm-commits]

lenary created this revision.
lenary added reviewers: asb, luismarques, shiva0217.
Herald added subscribers: llvm-commits, evandro, apazos, sameer.abuasal, pzheng, s.egerton, Jim, benna, psnobl, jocewei, PkmX, rkruppe, the_o, brucehoult, MartinMosbeck, rogfer01, edward-jones, zzheng, MaskRay, jrtc27, kito-cheng, niosHD, sabuasal, simoncook, johnrusso, rbar, hiraditya.
Herald added a project: LLVM.

We recieved a report that split SP adjustment was not performing optimally when
compressed instructions were available. This patch more closely matches the
`FirstSPAdjustAmount` to the available instructions, so that loading and storing
the callee-saved registers is done with compressed instructions on architectures
that support them.

This patch also contains a fix to the type of `SecondSPAdjustAmount` to
correctly track and check the sign of this adjustment.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D79141

Files:
  llvm/lib/Target/RISCV/RISCVFrameLowering.cpp
  llvm/test/CodeGen/RISCV/split-sp-adjust.ll

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