[all-commits] [llvm/llvm-project] 84a0c8: [AArch64][SVE] Spilling/filling of SVE callee-saves.

[sdesmalen-arm via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 84a0c8e3ae92829c4f04ba995b4b6283d397f65d
      https://github.com/llvm/llvm-project/commit/84a0c8e3ae92829c4f04ba995b4b6283d397f65d
  Author: Sander de Smalen <sander.desmalen at arm.com>
  Date:   2019-11-11 (Mon, 11 Nov 2019)

  Changed paths:
    M llvm/lib/AsmParser/LLLexer.cpp
    M llvm/lib/AsmParser/LLParser.cpp
    M llvm/lib/AsmParser/LLToken.h
    M llvm/lib/IR/AsmWriter.cpp
    M llvm/lib/Target/AArch64/AArch64CallingConvention.td
    M llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
    M llvm/lib/Target/AArch64/AArch64FrameLowering.h
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/AArch64MachineFunctionInfo.h
    M llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
    M llvm/test/CodeGen/AArch64/framelayout-sve.mir

  Log Message:
  -----------
  [AArch64][SVE] Spilling/filling of SVE callee-saves.

Implement the spills/fills of callee-saved SVE registers using STR and LDR
instructions.

Also adds the `aarch64_sve_vector_pcs` attribute to specify the
callee-saved registers to be used for functions that return SVE vectors or
take SVE vectors as arguments. The callee-saved registers are vector
registers z8-z23 and predicate registers p4-p15.

The overal frame-layout with SVE will be as follows:

   +-------------+
   | stack args  |
   +-------------+
   | Callee Saves|
   |   X29, X30  |
   |-------------| <- FP
   | SVE Callee  | < //////////////
   | saved regs  | < //////////////
   |    z23      | < //////////////
   |     :       | < // SCALABLE //
   |    z8       | < //////////////
   |    p15      | < /// STACK ////
   |     :       | < //////////////
   |    p4       | < //// AREA ////
   +-------------+ < //////////////
   |     :       | < //////////////
   |  SVE locals | < //////////////
   |     :       | < //////////////
   +-------------+
   |/////////////| alignment gap.
   |     :       |
   | Stack objs  |
   |     :       |
   +-------------+ <- SP after call and frame-setup

Reviewers: cameron.mcinally, efriedma, greened, thegameg, ostannard, rengolin

Reviewed By: ostannard

Differential Revision: https://reviews.llvm.org/D68996